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GeezerVison is showing github.com (truncated) — Add missing synchronization around load WinHttp proxy methods by OneBlue · Pull Request #41909 · microsoft/WSL

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@OneBlue

@OneBlue Blue (OneBlue) commented Oct 13, 2026

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Summary of the Pull Request

This change moves the entire loading of the winhttp methods under the std::call_once, otherwise two threads could be trying to load the methods in parallel and write the global std::optionals at the same time

PR Checklist

  • Closes: Link to issue #xxx
  • Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
  • Tests: Added/updated if needed and all pass
  • Localization: All end user facing strings can be localized
  • Dev docs: Added/updated if needed
  • Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

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@OneBlue
Add missing synchronization around load WinHttp proxy methods
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@OneBlue
Blue (OneBlue) requested a review from a team as a code owner October 13, 2026 19:26
Copilot AI balanced review requested due to automatic review settings October 13, 2026 19:26
Copilot started reviewing on behalf of Blue (OneBlue) October 13, 2026 19:27
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🟡 Changes recommended

Failed function loads are incorrectly converted to success, leaving required optionals empty.

1 open finding
  • High severity Preserve WinHTTP loader failure HRESULT instead of returning S_OK · New
What changed in this PR

Moves WinHTTP API loading under one-time synchronization to prevent concurrent writes.

Changes:

  • Synchronizes module and function loading with std::call_once.
  • Caches the load result for subsequent callers.
File Description
src/​windows/​service/​exe/​LxssHttpProxy.cpp Makes WinHTTP proxy API initialization thread-safe.

🧠 Review effort: Balanced


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Comment thread src/windows/service/exe/LxssHttpProxy.cpp Resolved

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@OneBlue
Fix loading logic
1cb801e
Copilot AI balanced review requested due to automatic review settings October 13, 2026 21:04
Copilot started reviewing on behalf of Blue (OneBlue) October 13, 2026 21:05
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🟢 Approval recommended

The focused change correctly serializes initialization and safely publishes its result to concurrent callers.

0 open findings

1 resolved since last review
  • High severity Preserve WinHTTP loader failure HRESULT instead of returning S_OK

🧠 Review effort: Balanced

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dkbennett
David Bennett (dkbennett) approved these changes Oct 13, 2026
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@OneBlue
Blue (OneBlue) merged commit 43da040 into master Oct 14, 2026
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@OneBlue
Blue (OneBlue) deleted the user/oneblue/fix-race-9 branch October 14, 2026 19:51
Daman Mulye (damanm24) added a commit that referenced this pull request Oct 16, 2026
@damanm24 @benhillis
Ben Hillis @OneBlue @49081 @dkbennett @chemwolf6922 @ggarzia-MSFT @FetoiuCatalin Catalin-Emil Fetoiu @beena352 @florelis @JohnMcPMS @keith-horton @craigloewen-msft @pswartzclan @archlinux-github @chessturo @xThreeh @Hekzory @tunabirgun
Merge latest main branch into feature/openvmm (#41952)
596a87a
* repo: modify CODEOWNERS to change wsl-maintainers to wsl-reviewers team (#41617)

Co-authored-by: Ben Hillis <[email protected]>

* Localization change from build: 157736413 (#41621)

Co-authored-by: WSL localization <[email protected]>

* CLI: Global option scopes for nested commands (related to compose support) (#41546)

* Change default relay  buffer size to 64KiB (#41603)

The current logic uses a fixed 4KiB buffer for stdio relay on the Windows side. And uses an initial 4KiB buffer for stdio relay on the Linux side, which grows only if the message won't fit. This can severely limit the relay performance in some situations. For example, in #41572, when redirecting stdout to a SMB share.

This PR increases thedefault relay buffer size to 64KiB. Which shows significant performance improvements according to buffer size tests.

* Fix redirect stdout and stderror to the same file overlapping (#41611)

Currently the stdout and stderr relay tracks the output offset separately. And when redirected to the same file, the writes could overlap.

This PR uses the append mode for overlap io writes instead of the separate offsets in the relay. So, the file write offset is correctly tracked by the system.

* move installer log collection after repro (#41620)

The installer log files were collected before the log collection starts. Which will miss the user repro.

This PR moves it after the user repro.

* wslc: add --digests to image list for docker parity (#41457)

Co-authored-by: Copilot <[email protected]>

* Localization change from build: 157843092 (#41630)

Co-authored-by: WSL localization <[email protected]>

* Explicitely return SOCKET from WSLCPluginAPI_ProcessGetFd() (#41626)

* In mirrored mode, handle route update as add instead of replace (#41391)

In mirrored mode, handle route update as add instead of replace
Remove usage of route update as it can overwrite routes on other interfaces. add tests that verify host routing changes are correctly reflected in Linux

---------

Co-authored-by: Catalin-Emil Fetoiu <[email protected]>

* Add wslc events command (#41608)

* Don't fail the UnitTests::Warnings test case if GlobalSecureAccess VPN is running (#41638)

* Don't fail the UnitTests::Warnings test case if GlobalSecureAccess VPN is running

* Cleanup diff

* Fix test

* Wait for wslservice to be started when running tests (#41639)

* Wait for wslservice to be started when running tests

* Fail on timeout

* Improve check

* Format

* Create new namespaces for distro cgroups (#41512)

In 2.9.8, the distro processes are separated into their own cgroups. But they remain in the same cgroup namespace. That caused compatibility issues with softwares that assume a fixed systemd cgroup layout. For example, rootless docker and nerdctl.
Fixes on Moby and nertctl are being worked on. However, to avoid issues with other software, WSL's cgroup handling should also be improved.

This PR creates new cgroup namespaces for the distros. So, to the non-critical distro processes, the systemd cgroup layout stays the same as before.
This PR also introduces a cgroup structure change to accomplish this. The systemd init is moved from wsl-user/distro-N/systemd to wsl-user/distro-N. And the initialization of the distro-N controllers is handled by systemd instead.
The processes are also moved into the non-systemd cgroup in systemdless distros. This makes sure that sub-group controllers can be enabled in the distro root.
Cgroup v2 is now enforced when distro isolation is enabled. Instead of constructing an unusable cgroup v1 layout when cgroup v1 and distro isolation are both enabled.

* Fix unnecessary delay in the port tracking loop (#41472)

Before this change, an additional 10ms delay was added in the port tracker loop presumably to make the main loop slower than the worker loop. So, the worker result does not get super dated. This is not reliable. And the 10ms delay also slows down every consecutive bind call.

This PR refactors the thread synchronization method. So, the timing between those two loops is more deterministic. And removes the performance penalty for all bind calls.

* Localization change from build: 157954210 (#41643)

Co-authored-by: WSL localization <[email protected]>

* wslc: add --follow-link to cp (#41501)

Co-authored-by: Copilot <[email protected]>

* Disable unstable bind cap test and re-enable Loopback test that was incorrectly disabled- #41648 (#41648)

Co-authored-by: Catalin-Emil Fetoiu <[email protected]>

* Move objects shared by wslc.exe and the tests to src/windows/common (#41619)

* Move objects shared by wslc.exe and the tests to src/windows/common

Co-authored-by: Copilot <[email protected]>

* Link yaml-cpp, advapi32 and Crypt32 into common

Co-authored-by: Copilot <[email protected]>

* Drop yaml-cpp, advapi32 and crypt32 from wslclib now that common provides them

Co-authored-by: Copilot <[email protected]>

* Move wslc code in common under common/wslc and namespace CLI types as wslc::cli

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix various protocol parsing issues (#41637)

* Save state

* Use proper arrays

* Format

* Add new tests

* Cleanup tests

* Cleanup diff

* Format

* Apply PR feedback

* Apply PR feedback

* Format

* Apply PR feedback

* Move logging call

* Apply PR feedback

* Apply PR feedback

* Localization change from build: 157980831 (#41647)

Co-authored-by: WSL localization <[email protected]>

* Add WSLC network lifecycle events (#41576)

* Add WSLC network lifecycle events

* Localize pending network prune errors

* Fix network operation wait ownership and cleanup ordering

* Fix prune event correlation after timed-out

* Fix network event rollback and timeout recovery

* Format

* Forward Docker network events directly

* Restore lock_guard after removing event waits

* fix test

* align event stream test helpers after merge

* feedback

* Fix potential out of bound access when pretty-printing string field in init messages (#41664)

* Localization change from build: 158197536 (#41662)

Co-authored-by: WSL localization <[email protected]>

* simplify event reader cleanup and remove unused include (#41667)

* Fix ipv4 forwarding when both v4 and v6 ports are listening

* Fix config's handling of non-ascii characters (#41657)

When parsing the config file, non-ascii utf-16 values are casted into char. This will mangle non-ascii values in the config file. For example, a custom kernel path containing Chinese characters will cause WSL_E_CUSTOM_KERNEL_NOT_FOUND.

This PR removes the faulty static cast and stores the config value in wstring instead of string. So non-ascii values are preserved.

* Prevent potential invalid access for string array pretty print (#41673)

* resolve comments (#41642)

This is a follow up to PR #41512

Remove the redundant restore cgroup namespace code.
Simplify the cgroup check logic by moving the retry inside the debug shell.
Add a new systemd boot timeout test.

* Use a static CRT in debug builds (#41684)

* Fix potential test failure in BrokenDistroImport by not assuming the disk's block device in WSL (#41686)

* Update releaseScripts reference from v1 to v2 (#41687)

* INcrease the VM termination timeout to 30 seconds (#41688)

* Impersonate the caller before making various filesystem operations (#41689)

* Impersonate the caller before making various filesystem operations

* Apply PR feedback

* Support STDIN through SDK (#41698)

* stdin flag

* add winrt test, fix coroutine bug in streams

* Followup to STDIN PR (#41703)

* Add ability to format your branch (#41699)

* Remove references to WSLC being in a preview (#41704)

* Don't write to the install log file if it's a reparse point (#41705)

* Use the latest ESRP signing key code (#41640)

* Use the latest ESRP signing key code

* Only change key code

* Restore original pipeline line endings

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Refactor event stream cancellation waits (#41696)

* Don't expect the brd module logline to stabilize the CustomDmesgOutput test case (#41714)

* Use WSL icon for developer docs (#41715)

* Use WSL icon for developer docs

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

* Reuse docs logo as favicon

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

* Fix: update drvfs gid uid after default uid is set in oobe (#41521)

For a newly installed distro, the drvfs are initially mount as 0:0. And is not updated after oobe sets the default uid. This could cause access issues before the distro is restarted.

This PR updates the auto mounted drvfs gid uid before completing the oobe. The non-auto mounted shares are not remounted to avoid breaking user set gid uid values.

* Update WSLC SDK API documentation (#41677)

* Update WSLC SDK API documentation

Co-authored-by: Copilot <[email protected]>

* Update docs

* Update docs

* Quick fixes

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>

* Updated README (#41723)

* Expose kernel headers and perf to distributions (#41400)

* Expose kernel headers and perf to distributions

Mount kernel-matched headers and perf tooling from the artifacts VHD into each distribution, expose perf through the default environment, and cover the resulting paths and replacement behavior.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

* Address kernel artifact review feedback

Correct the documented header target and directory fallback, and log failures while removing mount path environment variables.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

* Use iterators in FromJson to avoid copies (#41641)

* Use iterators in FromJson to avoid copies

* Cleanup

* Fix template build

* Format

* Use a retry with timeout in HostPortCantBeBoundByGuest (#41728)

* Run the nightly tests on ge-current (#41725)

* Don't fail configuring the consommé loopback adapter when ipv6 is disabled (#41729)

* Enable experimental sparse VHD creation (#41726)

* Refine sparse VHD creation policy

Co-authored-by: Copilot <[email protected]>

* Enable experimental sparse VHD creation in WSL

Co-authored-by: Copilot <[email protected]>

* Make sparse VHD unsafe flag optional

Co-authored-by: Copilot <[email protected]>

* Keep fixed VHD creation non-sparse

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Update Microsoft.RemoteDesktop.Client.MSRDC.SessionHost to version 1.2.7391 (#41730)

Co-authored-by: Ben Hillis <[email protected]>

* Fix WSL container event timestamps (#41717)

* Revert "Enable RedirectionGuard process mitigation" (#41744)

* Revert "Enable RedirectionGuard process mitigation (#41542)"

This reverts commit e53598d.

* Add comments

* Fix comment

* Add --format json to wslc events (#41734)

* Update the DACL to only allow access to the user when creating virtual disks (#41678)

* Update the DACL to only allow access to the user when creating virtual disks

* Save state

* Increase test coverage

* Fix test

* Apply PR feedback

* Apply PR feedback

* Format

* Apply PR suggestions

* Apply PR suggestions

* Clarify container image localization context (#41743)

Add translator guidance distinguishing container images from pictures or photos for the affected WSLC strings.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: 88d3d4b4-5a0e-4d97-9ed4-0fcd856e61de

* Add RLCPlus-9 and RLCPlus-10 (Rocky Linux Plus, CIQ) (#41323)

* Add RLCPlus-9 and RLCPlus-10 (Rocky Linux Plus, CIQ)

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Re-trigger CI: xattr check confirmed clean (no security.selinux attributes found), all four combinations remain boot-tested

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Fix race condition on system distro & init port access (#41762)

* archlinux: Release 2026.10.01.179549 (#41755)

This is an automated release [1].

[1] https://gitlab.archlinux.org/archlinux/archlinux-wsl/-/blob/main/.gitlab-ci.yml

* Enable automatic vNUMA for large WSL VMs (#41741)

* Enable automatic vNUMA for WSL VMs

Add the HCS NUMA topology object so HCS can derive a supported virtual topology for large processor counts instead of requiring WSL to clamp the VM to 256 processors.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Gate automatic vNUMA on Germanium

Preserve the existing single-node HCS configuration on older Windows builds where vNUMA topology creation is unsupported.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Remove vNUMA test coverage

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Exclude wslc.exe and wslcsession.exe from custom LSP providers (#41767)

* Exclude wslc.exe and wslcsession.exe from custom LSP providers

* Include container.exe

* Localization change from build: 159271766 (#41772)

Co-authored-by: WSL localization <[email protected]>

* Reuse EmptyObject for HCS NUMA configuration (#41768)

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Implement container health notifications to wslc events (#41763)

* Save state

* Increase test coverage

* Remove useless state

* Replace TableOutput with TableData model and TableRenderer (#41700)

Co-authored-by: Copilot <[email protected]>

* refactor container cp task to be simpler and move logic to container service and common filesystem helpers (#41668)

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Use a fallback gateway if no ipv4 gateway is available in consommé networking (#41779)

* Record Docker die and stop events with parity (#41770)

* Save state (#41780)

* Localization change from build: 159357096 (#41786)

Co-authored-by: WSL localization <[email protected]>

* Update issue template for WSLC (#41778)

* Update issue tempalte for WSLC

* Fix description

* Run the nightly tests on Windows Server 2025 (#41760)

* Run the nightly tests on ge-current

* Run the nightly tests on Windows Server 2025

* Skip some network tests

* Update name

* Fix mirrored check

* Use the server field

* Localization change from build: 159470205 (#41800)

Co-authored-by: WSL localization <[email protected]>

* Fix various issues preventing the ModernOOBE test from running multiple times on the same test_distro (#41781)

* Remove unused delay-load options (#41804)

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Disable pushing to the store by default (#41782)

* Scope down the ephemeral port range in various consommé tests (#41805)

* Fix race condition in LifetimeManager (#41807)

* Use DistroFileChange instead of going through wsl.localhost (#41810)

* Explicitely setup impersonation when instanciating IWslSupport (#41815)

* Wait for bound ports to be released by the port relay in the tests (#41817)

* Support reading the wslc image build context from stdin (#41765)

Co-authored-by: Copilot <[email protected]>

* Update Microsoft.WSL.Kernel to 6.18.54.1 (#41822)

* Add logic to reject commands with extra arguments (#41821)

* Add logic to reject commands with extra arguments

* Simplify tests

* Improve wslc event filters (#41809)

* Localization change from build: 159727887 (#41826)

Co-authored-by: WSL localization <[email protected]>

* Make the binfmt mount writable (#41808)

* Make the binfmt mount writeable

* Apply PR suggestions

* Match container and network filters across event types (#41818)

* Fix incorrect wsl.conf warnings being displayed when creating a new distribution (#41820)

* Convert EnsureCaseSensitiveDirectoryRecursive to iterative traversal (#40347)

* Convert EnsureCaseSensitiveDirectoryRecursive to iterative traversal

Replace unbounded recursive depth-first traversal with an iterative
approach using an explicit stack. A deeply nested directory tree could
overflow the thread stack during the recursive calls.

The iterative version collects directories in reverse post-order during
traversal, then marks them bottom-up (children before parents),
preserving the ordering invariant that EnsureCaseSensitiveDirectory
relies on for its early-exit optimization.

Bug: 61964147, 61974992, 61911308, 61463090

Co-authored-by: Copilot <[email protected]>

* Add deep-nesting regression test for case-sensitive recursion

The original recursive EnsureCaseSensitiveDirectoryRecursive could blow
the Windows 1 MB thread stack at a few hundred levels of nesting because
each frame carried a FILE_ID_BOTH_DIR_INFORMATION enumeration buffer.
The iterative implementation in this PR moves that state to the heap, so
a very deep tree must complete without crashing.

The test creates a 1024-level chain via the \\\\?\\ long-path prefix
(cumulative path length exceeds MAX_PATH) and then calls
EnsureCaseSensitiveDirectory on the root. Cleanup goes through the same
long-path prefix so remove_all can see every component.

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Add publishing to DCAT, nuget to the release pipeline (#41549)

* Add a testpass on rs_base2 (#41832)

* Run the nightly tests on rs_base2

* Update tests for os change

* Update tests

* Localization change from build: 159856815 (#41839)

Co-authored-by: WSL localization <[email protected]>

* Fix the security model link in SECURITY.md (#41835)

#41605 moved the security model to doc/docs/technical-documentation/security.md; the link in SECURITY.md still pointed at doc/docs/security.md.

* Fix RLCPlus distribution manifest formatting (#41841)

Restore canonical JSON indentation without changing distribution data so the distribution validation workflow passes its formatting check.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8

* Update GitPython to resolve Dependabot alerts (#41840)

Upgrade both Python tooling requirement pins to 3.1.62, which fixes all four advisories reported across eight Dependabot alerts.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8

* Fix CaseSensitivityDeepNesting test build failure (#41849)

Co-authored-by: Copilot <[email protected]>

* Reorganize test/windows into common/, wsl/, and wslc/ (#41661)

* Reorganize test/windows and split WSLCTests.cpp into per-domain files

Co-authored-by: Copilot <[email protected]>

* Split wslc tests into per-layer directories and move common unit tests under common/unit

Co-authored-by: Copilot <[email protected]>

* Flatten test/windows into common/, wsl/, wslc/ and move wslc helpers to common

Co-authored-by: Copilot <[email protected]>

* Port master's WSLC event and network tests into the split test files

Co-authored-by: Copilot <[email protected]>

* Revert WSLCTests.cpp split so the change is file moves only

Co-authored-by: Copilot <[email protected]>

* Update test layout guidance for common/wsl/wslc split

Co-authored-by: Copilot <[email protected]>

* Make CaseSensitivityDeepNesting testDir static constexpr so the lambda can use it

Co-authored-by: Copilot <[email protected]>

* Drop static from CaseSensitivityDeepNesting testDir so it can be captured

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix e2fsck return code 1 treated as failure in resize (#41720)

e2fsck -f -y returns 1 or 2 when there were errors fixed. However, the resize implementation currently only accepts 0 as a success.

This PR adds 1 and 2 to the accepted return codes.

* Document WSL architecture and contributor commands for Copilot (#41843)

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: 25aa9436-0656-41c8-a222-d81d6414a9e6

* Add WSLC volume events (#41831)

* Fix incorrect AAAA DNS resolution for static DNS records causing resolution failure in musl (#41859)

* Fix race condition causing potential use-after-free in NatNetworking (#41850)

* Acquire m_instanceLock before calling _ValidateDistributionNameAndPathNotInUse() (#41855)

* Acquire m_instanceLock before calling _ValidateDistributionNameAndPathNotInUse

* Cleanup diff

* Cleanup diff

* Make the store publish stage opt-in (#41857)

* Remove the gate before publishing nuget packages, and rename to avoid confusion (#41858)

* Remove the gate before publishing nuget packages, and rename to avoid confusion

* Complete nuget

* Fail bind() requests that fail in Windows (#41856)

* Don't add swiotlb=force with the hv_pci swiotlb pool (#41829)

The hv_pci pool is created with force_bounce set, so virtio devices
bounce through it without the global flag. swiotlb=force only made every
other device, mainly hv_storvsc, bounce all its I/O through the default
64 MB pool, which runs out under load (#41828).

* Fix potential crash caused by error during session initialization (#41887)

* Add a /hyperv to triage hyper-v issues (#41885)

* Localization change from build: 160297307 (#41890)

Co-authored-by: WSL localization <[email protected]>

* Increase the default commited stack size to 64KB (#41888)

* Increase the default commited stack size to 64KB

* Fix formatting of stack size comment in CMakeLists

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* suppress systemctl is-system-running pulling error messages (#41881)

The systemctl is-system-running polling can produce error messages like Failed to connect to bus: No such file or directory before d-bus is ready. And those error messages are duplicated into /dev/kmsg by wsl.

This PR suppresses the error messages as those are not useful for the polling result.

* Disable unsafe move constructors in ScopedRelay (#41897)

* Wait for the drvfs initialization thread to exit before destroying WslCoreVm (#41895)

* Fix potential crash by use-after-free by in the stdin relay thread (#41894)

* Release resources that could call callbacks before returning from HcsVirtualMachine's constructor on failure (#41908)

* Narrow volume event publish ordering comments (#41889)

* Apply clang-format to merged files

Co-authored-by: Copilot <[email protected]>
Copilot-Session: f2cf5bc5-64ce-4bfc-a921-ae7ca379ad64

* Add wslc cp alias for wslc container cp (#41902)

* Add wslc cp alias for wslc container cp

Co-authored-by: Copilot <[email protected]>

* Move wslc cp usage examples under generated usage line with color

Co-authored-by: Copilot <[email protected]>

* Use cp short description key and add cp help example tests

Co-authored-by: Copilot <[email protected]>

* Remove cp help examples

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix potential starvation in COMImplClass::Disconnect (#41912)

* Use repository NuGet configuration for out-of-tree builds (#41916)

* Fix a potential use-after-free between plugin calls and WSLCSessionManagerImpl's destruction (#41911)

* Save state

* Simplify reset logic

* Prepare for PR

* Add missing synchronization around load WinHttp proxy methods (#41909)

* Add missing synchronization around load WinHttp proxy methods

* Fix loading logic

* Fix missing synchronization on m_httpProxyStateTracker access (#41907)

* Fix missing synchronization on m_httpProxyStateTracker access

* Update header

* Use the instance lock instead

* Format

* Fix potential deadlock in between VM exit callback and session shutdown (#41910)

* Fix potential deadlock in between VM exit callback and ~LxssUserSessionImpl

* Cleanup diff

* Fix potential use-after-free in EpollWatcher (#41896)

* Match docker -v parsing: LTR spec parser, shared validation, config-v… (#41905)

* Match docker -v parsing: LTR spec parser, shared validation, config-volume anonymous volumes

Co-authored-by: Copilot <[email protected]>

* Reject extra colons in -v mode section

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Mount bind volumes during cp on non-running containers (#41906)

* Mount bind volumes during cp on non-running containers

Co-authored-by: Copilot <[email protected]>

* Mirror issue repro in bind mount cp test

Co-authored-by: Copilot <[email protected]>

* Throw on deleted container in archive mounts, generate test tar in container

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* reap sub processes during shutdown to unblock systemd (#41899)

After the cgroup isolation change. The process tree looks like this:
```
init (systemd)                 in the distro cgroup namespace
    init (wsl)                 in the root cgroup namespace
        login                  in the distro cgroup namespace
```
And the poweroff sequence is:

WSL init resets the signal handlers, which sets SIGCHLD to default.
WSL init calls systemctl poweroff
systemd kills processes in it's cgroup namespace like the login process. And skips processes like the wsl init in the root namespace.
The WSL init does not reap the killed sub process. Making it a zombie in the distro namespace.
Systemd waits for the zombie processes and blocks.
The timeout in init finally shutsdown with RB_POWER_OFF.
This could cause the terminate to wait for the timeout and slow down the termination.

This PR adds a waitpid loop that reaps any subprocesses of the WSL init during systemd poweroff. So systemd is no longer stuck by the zombie processes. And it calls BR_POWER_OFF itself to kill the WSL processes in the same PID namespace but in the root cgroup namespace.

* Localization change from build: 160603855 (#41933)

Co-authored-by: WSL localization <[email protected]>

* Fix incorrect srwlock usage in when initializing drvfs (#41925)

* Fix potential deadlock in WSL1 instance termination (#41922)

* Fix potential deadlock in WSL1 instance termination

* Differenciate using instance ids

* Prepare for PR

* Fix potential use-after-free if the WSLC VM is killed while the last session COM reference is being released (#41946)

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Blue <[email protected]>
Co-authored-by: WSL localization <[email protected]>
Co-authored-by: David Bennett <[email protected]>
Co-authored-by: Feng Wang <[email protected]>
Co-authored-by: ggarzia-MSFT <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: FetoiuCatalin <[email protected]>
Co-authored-by: Catalin-Emil Fetoiu <[email protected]>
Co-authored-by: beena352 <[email protected]>
Co-authored-by: Flor Chacón <[email protected]>
Co-authored-by: JohnMcPMS <[email protected]>
Co-authored-by: Keith Horton <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>
Co-authored-by: Patrick Swartz <[email protected]>
Co-authored-by: Copilot Autofix powered by AI <[email protected]>
Co-authored-by: Arch Linux Technical User <[email protected]>
Co-authored-by: Mitchell Levy <[email protected]>
Co-authored-by: Franco Ceballos Rastello <[email protected]>
Co-authored-by: Oleg Tsvetkov <[email protected]>
Co-authored-by: Tuna Birgün <[email protected]>
Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3
Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5
Copilot-Session: 88d3d4b4-5a0e-4d97-9ed4-0fcd856e61de
Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8
Copilot-Session: 25aa9436-0656-41c8-a222-d81d6414a9e6
Copilot-Session: f2cf5bc5-64ce-4bfc-a921-ae7ca379ad64
Daman Mulye (damanm24) added a commit that referenced this pull request Oct 22, 2026
@damanm24 @benhillis
Ben Hillis @OneBlue @49081 @dkbennett @chemwolf6922 @ggarzia-MSFT @FetoiuCatalin Catalin-Emil Fetoiu @beena352 @florelis @JohnMcPMS @keith-horton @craigloewen-msft @pswartzclan @archlinux-github @chessturo @xThreeh @Hekzory @tunabirgun @kvega005 Kevin Vega @metajack Jack Moffitt @licon4812 Feng Wang (from Dev Box)
Merge latest main branch into feature/openvmm (#42020)
ab84b22
* repo: modify CODEOWNERS to change wsl-maintainers to wsl-reviewers team (#41617)

Co-authored-by: Ben Hillis <[email protected]>

* Localization change from build: 157736413 (#41621)

Co-authored-by: WSL localization <[email protected]>

* CLI: Global option scopes for nested commands (related to compose support) (#41546)

* Change default relay  buffer size to 64KiB (#41603)

The current logic uses a fixed 4KiB buffer for stdio relay on the Windows side. And uses an initial 4KiB buffer for stdio relay on the Linux side, which grows only if the message won't fit. This can severely limit the relay performance in some situations. For example, in #41572, when redirecting stdout to a SMB share.

This PR increases thedefault relay buffer size to 64KiB. Which shows significant performance improvements according to buffer size tests.

* Fix redirect stdout and stderror to the same file overlapping (#41611)

Currently the stdout and stderr relay tracks the output offset separately. And when redirected to the same file, the writes could overlap.

This PR uses the append mode for overlap io writes instead of the separate offsets in the relay. So, the file write offset is correctly tracked by the system.

* move installer log collection after repro (#41620)

The installer log files were collected before the log collection starts. Which will miss the user repro.

This PR moves it after the user repro.

* wslc: add --digests to image list for docker parity (#41457)

Co-authored-by: Copilot <[email protected]>

* Localization change from build: 157843092 (#41630)

Co-authored-by: WSL localization <[email protected]>

* Explicitely return SOCKET from WSLCPluginAPI_ProcessGetFd() (#41626)

* In mirrored mode, handle route update as add instead of replace (#41391)

In mirrored mode, handle route update as add instead of replace
Remove usage of route update as it can overwrite routes on other interfaces. add tests that verify host routing changes are correctly reflected in Linux

---------

Co-authored-by: Catalin-Emil Fetoiu <[email protected]>

* Add wslc events command (#41608)

* Don't fail the UnitTests::Warnings test case if GlobalSecureAccess VPN is running (#41638)

* Don't fail the UnitTests::Warnings test case if GlobalSecureAccess VPN is running

* Cleanup diff

* Fix test

* Wait for wslservice to be started when running tests (#41639)

* Wait for wslservice to be started when running tests

* Fail on timeout

* Improve check

* Format

* Create new namespaces for distro cgroups (#41512)

In 2.9.8, the distro processes are separated into their own cgroups. But they remain in the same cgroup namespace. That caused compatibility issues with softwares that assume a fixed systemd cgroup layout. For example, rootless docker and nerdctl.
Fixes on Moby and nertctl are being worked on. However, to avoid issues with other software, WSL's cgroup handling should also be improved.

This PR creates new cgroup namespaces for the distros. So, to the non-critical distro processes, the systemd cgroup layout stays the same as before.
This PR also introduces a cgroup structure change to accomplish this. The systemd init is moved from wsl-user/distro-N/systemd to wsl-user/distro-N. And the initialization of the distro-N controllers is handled by systemd instead.
The processes are also moved into the non-systemd cgroup in systemdless distros. This makes sure that sub-group controllers can be enabled in the distro root.
Cgroup v2 is now enforced when distro isolation is enabled. Instead of constructing an unusable cgroup v1 layout when cgroup v1 and distro isolation are both enabled.

* Fix unnecessary delay in the port tracking loop (#41472)

Before this change, an additional 10ms delay was added in the port tracker loop presumably to make the main loop slower than the worker loop. So, the worker result does not get super dated. This is not reliable. And the 10ms delay also slows down every consecutive bind call.

This PR refactors the thread synchronization method. So, the timing between those two loops is more deterministic. And removes the performance penalty for all bind calls.

* Localization change from build: 157954210 (#41643)

Co-authored-by: WSL localization <[email protected]>

* wslc: add --follow-link to cp (#41501)

Co-authored-by: Copilot <[email protected]>

* Disable unstable bind cap test and re-enable Loopback test that was incorrectly disabled- #41648 (#41648)

Co-authored-by: Catalin-Emil Fetoiu <[email protected]>

* Move objects shared by wslc.exe and the tests to src/windows/common (#41619)

* Move objects shared by wslc.exe and the tests to src/windows/common

Co-authored-by: Copilot <[email protected]>

* Link yaml-cpp, advapi32 and Crypt32 into common

Co-authored-by: Copilot <[email protected]>

* Drop yaml-cpp, advapi32 and crypt32 from wslclib now that common provides them

Co-authored-by: Copilot <[email protected]>

* Move wslc code in common under common/wslc and namespace CLI types as wslc::cli

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix various protocol parsing issues (#41637)

* Save state

* Use proper arrays

* Format

* Add new tests

* Cleanup tests

* Cleanup diff

* Format

* Apply PR feedback

* Apply PR feedback

* Format

* Apply PR feedback

* Move logging call

* Apply PR feedback

* Apply PR feedback

* Localization change from build: 157980831 (#41647)

Co-authored-by: WSL localization <[email protected]>

* Add WSLC network lifecycle events (#41576)

* Add WSLC network lifecycle events

* Localize pending network prune errors

* Fix network operation wait ownership and cleanup ordering

* Fix prune event correlation after timed-out

* Fix network event rollback and timeout recovery

* Format

* Forward Docker network events directly

* Restore lock_guard after removing event waits

* fix test

* align event stream test helpers after merge

* feedback

* Fix potential out of bound access when pretty-printing string field in init messages (#41664)

* Localization change from build: 158197536 (#41662)

Co-authored-by: WSL localization <[email protected]>

* simplify event reader cleanup and remove unused include (#41667)

* Fix ipv4 forwarding when both v4 and v6 ports are listening

* Fix config's handling of non-ascii characters (#41657)

When parsing the config file, non-ascii utf-16 values are casted into char. This will mangle non-ascii values in the config file. For example, a custom kernel path containing Chinese characters will cause WSL_E_CUSTOM_KERNEL_NOT_FOUND.

This PR removes the faulty static cast and stores the config value in wstring instead of string. So non-ascii values are preserved.

* Prevent potential invalid access for string array pretty print (#41673)

* resolve comments (#41642)

This is a follow up to PR #41512

Remove the redundant restore cgroup namespace code.
Simplify the cgroup check logic by moving the retry inside the debug shell.
Add a new systemd boot timeout test.

* Use a static CRT in debug builds (#41684)

* Fix potential test failure in BrokenDistroImport by not assuming the disk's block device in WSL (#41686)

* Update releaseScripts reference from v1 to v2 (#41687)

* INcrease the VM termination timeout to 30 seconds (#41688)

* Impersonate the caller before making various filesystem operations (#41689)

* Impersonate the caller before making various filesystem operations

* Apply PR feedback

* Support STDIN through SDK (#41698)

* stdin flag

* add winrt test, fix coroutine bug in streams

* Followup to STDIN PR (#41703)

* Add ability to format your branch (#41699)

* Remove references to WSLC being in a preview (#41704)

* Don't write to the install log file if it's a reparse point (#41705)

* Use the latest ESRP signing key code (#41640)

* Use the latest ESRP signing key code

* Only change key code

* Restore original pipeline line endings

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Refactor event stream cancellation waits (#41696)

* Don't expect the brd module logline to stabilize the CustomDmesgOutput test case (#41714)

* Use WSL icon for developer docs (#41715)

* Use WSL icon for developer docs

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

* Reuse docs logo as favicon

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

* Fix: update drvfs gid uid after default uid is set in oobe (#41521)

For a newly installed distro, the drvfs are initially mount as 0:0. And is not updated after oobe sets the default uid. This could cause access issues before the distro is restarted.

This PR updates the auto mounted drvfs gid uid before completing the oobe. The non-auto mounted shares are not remounted to avoid breaking user set gid uid values.

* Update WSLC SDK API documentation (#41677)

* Update WSLC SDK API documentation

Co-authored-by: Copilot <[email protected]>

* Update docs

* Update docs

* Quick fixes

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>

* Updated README (#41723)

* Expose kernel headers and perf to distributions (#41400)

* Expose kernel headers and perf to distributions

Mount kernel-matched headers and perf tooling from the artifacts VHD into each distribution, expose perf through the default environment, and cover the resulting paths and replacement behavior.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

* Address kernel artifact review feedback

Correct the documented header target and directory fallback, and log failures while removing mount path environment variables.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

* Use iterators in FromJson to avoid copies (#41641)

* Use iterators in FromJson to avoid copies

* Cleanup

* Fix template build

* Format

* Use a retry with timeout in HostPortCantBeBoundByGuest (#41728)

* Run the nightly tests on ge-current (#41725)

* Don't fail configuring the consommé loopback adapter when ipv6 is disabled (#41729)

* Enable experimental sparse VHD creation (#41726)

* Refine sparse VHD creation policy

Co-authored-by: Copilot <[email protected]>

* Enable experimental sparse VHD creation in WSL

Co-authored-by: Copilot <[email protected]>

* Make sparse VHD unsafe flag optional

Co-authored-by: Copilot <[email protected]>

* Keep fixed VHD creation non-sparse

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Update Microsoft.RemoteDesktop.Client.MSRDC.SessionHost to version 1.2.7391 (#41730)

Co-authored-by: Ben Hillis <[email protected]>

* Fix WSL container event timestamps (#41717)

* Revert "Enable RedirectionGuard process mitigation" (#41744)

* Revert "Enable RedirectionGuard process mitigation (#41542)"

This reverts commit e53598d.

* Add comments

* Fix comment

* Add --format json to wslc events (#41734)

* Update the DACL to only allow access to the user when creating virtual disks (#41678)

* Update the DACL to only allow access to the user when creating virtual disks

* Save state

* Increase test coverage

* Fix test

* Apply PR feedback

* Apply PR feedback

* Format

* Apply PR suggestions

* Apply PR suggestions

* Clarify container image localization context (#41743)

Add translator guidance distinguishing container images from pictures or photos for the affected WSLC strings.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: 88d3d4b4-5a0e-4d97-9ed4-0fcd856e61de

* Add RLCPlus-9 and RLCPlus-10 (Rocky Linux Plus, CIQ) (#41323)

* Add RLCPlus-9 and RLCPlus-10 (Rocky Linux Plus, CIQ)

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Re-trigger CI: xattr check confirmed clean (no security.selinux attributes found), all four combinations remain boot-tested

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Fix race condition on system distro & init port access (#41762)

* archlinux: Release 2026.10.01.179549 (#41755)

This is an automated release [1].

[1] https://gitlab.archlinux.org/archlinux/archlinux-wsl/-/blob/main/.gitlab-ci.yml

* Enable automatic vNUMA for large WSL VMs (#41741)

* Enable automatic vNUMA for WSL VMs

Add the HCS NUMA topology object so HCS can derive a supported virtual topology for large processor counts instead of requiring WSL to clamp the VM to 256 processors.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Gate automatic vNUMA on Germanium

Preserve the existing single-node HCS configuration on older Windows builds where vNUMA topology creation is unsupported.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Remove vNUMA test coverage

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Exclude wslc.exe and wslcsession.exe from custom LSP providers (#41767)

* Exclude wslc.exe and wslcsession.exe from custom LSP providers

* Include container.exe

* Localization change from build: 159271766 (#41772)

Co-authored-by: WSL localization <[email protected]>

* Reuse EmptyObject for HCS NUMA configuration (#41768)

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Implement container health notifications to wslc events (#41763)

* Save state

* Increase test coverage

* Remove useless state

* Replace TableOutput with TableData model and TableRenderer (#41700)

Co-authored-by: Copilot <[email protected]>

* refactor container cp task to be simpler and move logic to container service and common filesystem helpers (#41668)

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Use a fallback gateway if no ipv4 gateway is available in consommé networking (#41779)

* Record Docker die and stop events with parity (#41770)

* Save state (#41780)

* Localization change from build: 159357096 (#41786)

Co-authored-by: WSL localization <[email protected]>

* Update issue template for WSLC (#41778)

* Update issue tempalte for WSLC

* Fix description

* Run the nightly tests on Windows Server 2025 (#41760)

* Run the nightly tests on ge-current

* Run the nightly tests on Windows Server 2025

* Skip some network tests

* Update name

* Fix mirrored check

* Use the server field

* Localization change from build: 159470205 (#41800)

Co-authored-by: WSL localization <[email protected]>

* Fix various issues preventing the ModernOOBE test from running multiple times on the same test_distro (#41781)

* Remove unused delay-load options (#41804)

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Disable pushing to the store by default (#41782)

* Scope down the ephemeral port range in various consommé tests (#41805)

* Fix race condition in LifetimeManager (#41807)

* Use DistroFileChange instead of going through wsl.localhost (#41810)

* Explicitely setup impersonation when instanciating IWslSupport (#41815)

* Wait for bound ports to be released by the port relay in the tests (#41817)

* Support reading the wslc image build context from stdin (#41765)

Co-authored-by: Copilot <[email protected]>

* Update Microsoft.WSL.Kernel to 6.18.54.1 (#41822)

* Add logic to reject commands with extra arguments (#41821)

* Add logic to reject commands with extra arguments

* Simplify tests

* Improve wslc event filters (#41809)

* Localization change from build: 159727887 (#41826)

Co-authored-by: WSL localization <[email protected]>

* Make the binfmt mount writable (#41808)

* Make the binfmt mount writeable

* Apply PR suggestions

* Match container and network filters across event types (#41818)

* Fix incorrect wsl.conf warnings being displayed when creating a new distribution (#41820)

* Convert EnsureCaseSensitiveDirectoryRecursive to iterative traversal (#40347)

* Convert EnsureCaseSensitiveDirectoryRecursive to iterative traversal

Replace unbounded recursive depth-first traversal with an iterative
approach using an explicit stack. A deeply nested directory tree could
overflow the thread stack during the recursive calls.

The iterative version collects directories in reverse post-order during
traversal, then marks them bottom-up (children before parents),
preserving the ordering invariant that EnsureCaseSensitiveDirectory
relies on for its early-exit optimization.

Bug: 61964147, 61974992, 61911308, 61463090

Co-authored-by: Copilot <[email protected]>

* Add deep-nesting regression test for case-sensitive recursion

The original recursive EnsureCaseSensitiveDirectoryRecursive could blow
the Windows 1 MB thread stack at a few hundred levels of nesting because
each frame carried a FILE_ID_BOTH_DIR_INFORMATION enumeration buffer.
The iterative implementation in this PR moves that state to the heap, so
a very deep tree must complete without crashing.

The test creates a 1024-level chain via the \\\\?\\ long-path prefix
(cumulative path length exceeds MAX_PATH) and then calls
EnsureCaseSensitiveDirectory on the root. Cleanup goes through the same
long-path prefix so remove_all can see every component.

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Add publishing to DCAT, nuget to the release pipeline (#41549)

* Add a testpass on rs_base2 (#41832)

* Run the nightly tests on rs_base2

* Update tests for os change

* Update tests

* Localization change from build: 159856815 (#41839)

Co-authored-by: WSL localization <[email protected]>

* Fix the security model link in SECURITY.md (#41835)

#41605 moved the security model to doc/docs/technical-documentation/security.md; the link in SECURITY.md still pointed at doc/docs/security.md.

* Fix RLCPlus distribution manifest formatting (#41841)

Restore canonical JSON indentation without changing distribution data so the distribution validation workflow passes its formatting check.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8

* Update GitPython to resolve Dependabot alerts (#41840)

Upgrade both Python tooling requirement pins to 3.1.62, which fixes all four advisories reported across eight Dependabot alerts.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8

* Fix CaseSensitivityDeepNesting test build failure (#41849)

Co-authored-by: Copilot <[email protected]>

* Reorganize test/windows into common/, wsl/, and wslc/ (#41661)

* Reorganize test/windows and split WSLCTests.cpp into per-domain files

Co-authored-by: Copilot <[email protected]>

* Split wslc tests into per-layer directories and move common unit tests under common/unit

Co-authored-by: Copilot <[email protected]>

* Flatten test/windows into common/, wsl/, wslc/ and move wslc helpers to common

Co-authored-by: Copilot <[email protected]>

* Port master's WSLC event and network tests into the split test files

Co-authored-by: Copilot <[email protected]>

* Revert WSLCTests.cpp split so the change is file moves only

Co-authored-by: Copilot <[email protected]>

* Update test layout guidance for common/wsl/wslc split

Co-authored-by: Copilot <[email protected]>

* Make CaseSensitivityDeepNesting testDir static constexpr so the lambda can use it

Co-authored-by: Copilot <[email protected]>

* Drop static from CaseSensitivityDeepNesting testDir so it can be captured

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix e2fsck return code 1 treated as failure in resize (#41720)

e2fsck -f -y returns 1 or 2 when there were errors fixed. However, the resize implementation currently only accepts 0 as a success.

This PR adds 1 and 2 to the accepted return codes.

* Document WSL architecture and contributor commands for Copilot (#41843)

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: 25aa9436-0656-41c8-a222-d81d6414a9e6

* Add WSLC volume events (#41831)

* Fix incorrect AAAA DNS resolution for static DNS records causing resolution failure in musl (#41859)

* Fix race condition causing potential use-after-free in NatNetworking (#41850)

* Acquire m_instanceLock before calling _ValidateDistributionNameAndPathNotInUse() (#41855)

* Acquire m_instanceLock before calling _ValidateDistributionNameAndPathNotInUse

* Cleanup diff

* Cleanup diff

* Make the store publish stage opt-in (#41857)

* Remove the gate before publishing nuget packages, and rename to avoid confusion (#41858)

* Remove the gate before publishing nuget packages, and rename to avoid confusion

* Complete nuget

* Fail bind() requests that fail in Windows (#41856)

* Don't add swiotlb=force with the hv_pci swiotlb pool (#41829)

The hv_pci pool is created with force_bounce set, so virtio devices
bounce through it without the global flag. swiotlb=force only made every
other device, mainly hv_storvsc, bounce all its I/O through the default
64 MB pool, which runs out under load (#41828).

* Fix potential crash caused by error during session initialization (#41887)

* Add a /hyperv to triage hyper-v issues (#41885)

* Localization change from build: 160297307 (#41890)

Co-authored-by: WSL localization <[email protected]>

* Increase the default commited stack size to 64KB (#41888)

* Increase the default commited stack size to 64KB

* Fix formatting of stack size comment in CMakeLists

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* suppress systemctl is-system-running pulling error messages (#41881)

The systemctl is-system-running polling can produce error messages like Failed to connect to bus: No such file or directory before d-bus is ready. And those error messages are duplicated into /dev/kmsg by wsl.

This PR suppresses the error messages as those are not useful for the polling result.

* Disable unsafe move constructors in ScopedRelay (#41897)

* Wait for the drvfs initialization thread to exit before destroying WslCoreVm (#41895)

* Fix potential crash by use-after-free by in the stdin relay thread (#41894)

* Release resources that could call callbacks before returning from HcsVirtualMachine's constructor on failure (#41908)

* Narrow volume event publish ordering comments (#41889)

* Add wslc cp alias for wslc container cp (#41902)

* Add wslc cp alias for wslc container cp

Co-authored-by: Copilot <[email protected]>

* Move wslc cp usage examples under generated usage line with color

Co-authored-by: Copilot <[email protected]>

* Use cp short description key and add cp help example tests

Co-authored-by: Copilot <[email protected]>

* Remove cp help examples

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix potential starvation in COMImplClass::Disconnect (#41912)

* Use repository NuGet configuration for out-of-tree builds (#41916)

* Fix a potential use-after-free between plugin calls and WSLCSessionManagerImpl's destruction (#41911)

* Save state

* Simplify reset logic

* Prepare for PR

* Add missing synchronization around load WinHttp proxy methods (#41909)

* Add missing synchronization around load WinHttp proxy methods

* Fix loading logic

* Fix missing synchronization on m_httpProxyStateTracker access (#41907)

* Fix missing synchronization on m_httpProxyStateTracker access

* Update header

* Use the instance lock instead

* Format

* Fix potential deadlock in between VM exit callback and session shutdown (#41910)

* Fix potential deadlock in between VM exit callback and ~LxssUserSessionImpl

* Cleanup diff

* Fix potential use-after-free in EpollWatcher (#41896)

* Match docker -v parsing: LTR spec parser, shared validation, config-v… (#41905)

* Match docker -v parsing: LTR spec parser, shared validation, config-volume anonymous volumes

Co-authored-by: Copilot <[email protected]>

* Reject extra colons in -v mode section

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Mount bind volumes during cp on non-running containers (#41906)

* Mount bind volumes during cp on non-running containers

Co-authored-by: Copilot <[email protected]>

* Mirror issue repro in bind mount cp test

Co-authored-by: Copilot <[email protected]>

* Throw on deleted container in archive mounts, generate test tar in container

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* reap sub processes during shutdown to unblock systemd (#41899)

After the cgroup isolation change. The process tree looks like this:
```
init (systemd)                 in the distro cgroup namespace
    init (wsl)                 in the root cgroup namespace
        login                  in the distro cgroup namespace
```
And the poweroff sequence is:

WSL init resets the signal handlers, which sets SIGCHLD to default.
WSL init calls systemctl poweroff
systemd kills processes in it's cgroup namespace like the login process. And skips processes like the wsl init in the root namespace.
The WSL init does not reap the killed sub process. Making it a zombie in the distro namespace.
Systemd waits for the zombie processes and blocks.
The timeout in init finally shutsdown with RB_POWER_OFF.
This could cause the terminate to wait for the timeout and slow down the termination.

This PR adds a waitpid loop that reaps any subprocesses of the WSL init during systemd poweroff. So systemd is no longer stuck by the zombie processes. And it calls BR_POWER_OFF itself to kill the WSL processes in the same PID namespace but in the root cgroup namespace.

* Localization change from build: 160603855 (#41933)

Co-authored-by: WSL localization <[email protected]>

* Fix incorrect srwlock usage in when initializing drvfs (#41925)

* Fix potential deadlock in WSL1 instance termination (#41922)

* Fix potential deadlock in WSL1 instance termination

* Differenciate using instance ids

* Prepare for PR

* Fix potential use-after-free if the WSLC VM is killed while the last session COM reference is being released (#41946)

* Try smaller port ranges when mirrored mode cannot allocate ports (#41880)

The mirrored network mode requires a continuous 4096 port range. This allocation can fail if the host port range is fragmented. And if the allocation fails, the network mode falls back to none without a clear user facing message.

This PR makes two changes:

Retry the port allocation with a smaller range if the default 4096 count fails. Down to 512 ports.
Add user warnings when a smaller port range is used or the allocation eventually fails.

* Fix wslservice potentially killing wslcsession process too early (#41951)

* Localization change from build: 160716380 (#41954)

Co-authored-by: WSL localization <[email protected]>

* Fix wslc inspect for slash-prefixed container names (#41923)

* Fix WSLC GPU hook execution and library discovery (#41886)

* Add hourly upstream sync workflow for feature/wsl-for-apps

* Remove upstream sync workflow

* Fix WSLC GPU hook execution and library discovery

Run image-provided ldconfig only from the sandboxed startContainer hook. Retain VM-side cache generation for non-root, read-only and minimal images, and configure musl library discovery.

Co-authored-by: Copilot <[email protected]>

* Address feedback

* Preserve GPU library discovery for non-root WSLC containers

Use a temporary root-owned setuid helper after container restrictions are applied, remove it before invoking image ldconfig, and preserve root identity through shell wrappers. Cover non-root loading, restart, privilege restrictions, and hook failures, with comments explaining the lifecycle and permission choices.

Co-authored-by: Copilot App <[email protected]>
Copilot-Session: 41029ba7-2173-4277-b148-5de84b1db137

* Keep GPU linker-cache tests on WSLC APIs and bundled images

Use bundled Debian's Perl loader instead of pulling a Python image, replace Docker lifecycle commands with WSLC APIs, and remove Docker-only policy cases. Compare hook capabilities with an ordinary root WSLC process and keep rationale comments next to the relevant checks.

Co-authored-by: Copilot App <[email protected]>
Copilot-Session: 41029ba7-2173-4277-b148-5de84b1db137

---------

Co-authored-by: Kevin Vega <[email protected]>
Co-authored-by: Copilot <[email protected]>
Copilot-Session: 41029ba7-2173-4277-b148-5de84b1db137

* Fix NAT relay listener lifetime across active connections (#41948)

Co-authored-by: Jack Moffitt <[email protected]>

* Warn when nested virtualization capability detection fails (#41942)

* Initial plan

* Warn when nested virtualization capability detection fails

Co-authored-by: benhillis <[email protected]>

* Distinguish nested virtualization detection failures

Emit a localized detection-failure warning with the error code while retaining the unsupported warning for negative capability results.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: bbd8114d-2fc2-4be1-a8b0-f3fc6dc3f3d2

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: benhillis <[email protected]>
Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: bbd8114d-2fc2-4be1-a8b0-f3fc6dc3f3d2

* Fix potential hang when a distribution is terminated while waiting on OOBE (#41924)

* Fix race condition in Signal() / ResizeTty() process logic (#41929)

* Fix race condition in Signal() / ResizeTty() process logic

* Fix test case

* Fix potential use free in WSLCContainer (#41949)

* Remove bundled perf integration (#41904)

* Expose bundled perf through WSL-owned paths

Keep perf artifacts read-only and expose them through a per-distro wrapper and managed local symlink without modifying distro packages or session search paths.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: dc502fd6-021a-4a35-8227-e3688decebda

* Preserve explicit perf helper path overrides

Default the runtime wrapper's PERF_EXEC_PATH only when unset or empty, and cover empty values and inherited overrides.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: dc502fd6-021a-4a35-8227-e3688decebda

* Strengthen bundled perf package-isolation coverage

Verify PERF_EXEC_PATH is not set globally and regular distro perf replacements remain writable across restarts.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: 513b5be8-a1a8-4bf1-8938-b74e06526ee3

* Prefer distro perf before bundled fallback

Dispatch to executable distro perf before setting bundled helper defaults, preserving arguments and failures. Cover dynamic selection and fallback, and document the behavior.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: 513b5be8-a1a8-4bf1-8938-b74e06526ee3

* Remove bundled perf integration

Stop mounting and exposing bundled perf so distro packages own perf installation and selection. Preserve kernel headers and modules and cover distro perf replacement across restarts.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: 513b5be8-a1a8-4bf1-8938-b74e06526ee3

* Remove obsolete distro perf regression test

Co-authored-by: Copilot <[email protected]>

Copilot-Session: 513b5be8-a1a8-4bf1-8938-b74e06526ee3

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: dc502fd6-021a-4a35-8227-e3688decebda
Copilot-Session: 513b5be8-a1a8-4bf1-8938-b74e06526ee3

* Fix potential hang while waiting for timezone thread (#41926)

* Run DCAT release jobs on a custom pool (#41961)

* Fix potential deadlock + use-after-free in WatchForExitedProcesses (#41928)

* Fix potential deadlock in WatchForExitedProcesses

* Cleanup test

* Move to an external registry

* Format

* WSLc Clarify image pull status message (#41753)

* Clarify image pull status message

Updates the `WSLCCLI_ImageNotFoundPulling` en-US resource string to say `not found locally` before pulling. This makes it clear the image may exist remotely and improves CLI message clarity.

* Update image pull test expectation

Co-authored-by: licon4812 <[email protected]>

* Reword image pull message and update test

Updates the en-US `WSLCCLI_ImageNotFoundPulling` string to a clearer phrasing: `Unable to find image '{}' locally, pulling`. The WSLC container create E2E test expectation was updated to match this exact output so behavior and test assertions stay aligned.

* Align WSLC missing image message with Docker

Co-authored-by: licon4812 <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>

* Localization change from build: 160948052 (#41972)

Co-authored-by: WSL localization <[email protected]>

* Don't sleep for 3 hours waiting for the installer service (#41962)

* Match console detach sequence for full UTF-16 characters (#41960)

* Match console detach sequence on full UTF-16 chars

Co-authored-by: Copilot <[email protected]>

* Add console detach unicode low-byte test

Co-authored-by: Copilot <[email protected]>

* Move detach unicode test to wslc pseudoconsole E2E

Co-authored-by: Copilot <[email protected]>

* Write detach test unicode pair separately from marker

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Notice change from build: 160977557 (#41977)

Co-authored-by: WSL notice <[email protected]>

* fix plan9 truncate the wrong file after replacement (#41974)

* Fix guiApplications config parsing (#41973)

* fix start up parsing regression

* Fix distro config parsing logic

* Add unit test

* Notice change from build: 160989053 (#41980)

Co-authored-by: WSL notice <[email protected]>

* Fix potential use-after-free in MirroredNetworking (#41982)

* Add missing synchronization around container & process handles (#41983)

* CLI: Add --ipv6 to network create (#41303)

* Fix concurrent resource access in WSL1 instance during OOBE (#41981)

* Fix concurrent resource access in WSL1 instance during OOBE

* Don't get stuck if the distro gets stuck

* Raise distributionStartTimeout to 4 hours to trigger the test watchdogs when stuck (#42001)

* Use canonical path in WSLCE2E_Container_Cp_ContainerToLocal_FileDestinationBehavior (#42004)

* Fix incorrect COM lifetime tracking causing wslcsession.exe to potentially exit while references are still held by clients (#42000)

* Save state

* Mark pruned containers as exited

* Revert "Mark pruned containers as exited"

This reverts commit 91af5d2, including its test changes.

* Load container images

* Use a GIT reference

* Fix potential use free in WSLCContainer

* Support encrypted when opening the vhd for compaction (#42008)

* wslc rm --force: succeed when container does not exist (#42010)

Co-authored-by: Copilot <[email protected]>

* Add --cap-add and --cap-drop to wslc run and create for both cli and sdk (#41681)

* add --cap-add and --cap-drop options

* avoid repeating the warning on retry

* update docs

* fix localization

* update component check logic to avoid mismatch

* block container run and create when cap add is disabled

* Use version check instead of interface check

* allow current version in runtime version check

* resolve compatibility unrelated comments

* change compatibility design

* resolve comment

---------

Co-authored-by: Feng Wang (from Dev Box) <[email protected]>

* Update Microsoft.NETCore.App.Runtime to 10.0.13 (#42003)

* address previous feedback

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Blue <[email protected]>
Co-authored-by: WSL localization <[email protected]>
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Co-authored-by: Feng Wang <[email protected]>
Co-authored-by: ggarzia-MSFT <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: FetoiuCatalin <[email protected]>
Co-authored-by: Catalin-Emil Fetoiu <[email protected]>
Co-authored-by: beena352 <[email protected]>
Co-authored-by: Flor Chacón <[email protected]>
Co-authored-by: JohnMcPMS <[email protected]>
Co-authored-by: Keith Horton <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>
Co-authored-by: Patrick Swartz <[email protected]>
Co-authored-by: Copilot Autofix powered by AI <[email protected]>
Co-authored-by: Arch Linux Technical User <[email protected]>
Co-authored-by: Mitchell Levy <[email protected]>
Co-authored-by: Franco Ceballos Rastello <[email protected]>
Co-authored-by: Oleg Tsvetkov <[email protected]>
Co-authored-by: Tuna Birgün <[email protected]>
Co-authored-by: Kevin Vega <[email protected]>
Co-authored-by: Kevin Vega <[email protected]>
Co-authored-by: Jack Moffitt <[email protected]>
Co-authored-by: Jack Moffitt <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: benhillis <[email protected]>
Co-authored-by: James Alickolli <[email protected]>
Co-authored-by: Feng Wang (from Dev Box) <[email protected]>
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Copilot-Session: dc502fd6-021a-4a35-8227-e3688decebda
Copilot-Session: 513b5be8-a1a8-4bf1-8938-b74e06526ee3
Daman Mulye (damanm24) added a commit that referenced this pull request Nov 6, 2026
@damanm24 @benhillis
Ben Hillis @OneBlue @49081 @dkbennett @chemwolf6922 @ggarzia-MSFT @FetoiuCatalin Catalin-Emil Fetoiu @beena352 @florelis @JohnMcPMS @keith-horton @craigloewen-msft @pswartzclan @archlinux-github @chessturo @xThreeh @Hekzory @tunabirgun Daman Mulye
Refactor WSL2 VM management behind an HCS backend (#42031)
bdef1c2
* Add Rust client for the OpenVMM VM service (#41618)

* repo: modify CODEOWNERS to change wsl-maintainers to wsl-reviewers team (#41617)

Co-authored-by: Ben Hillis <[email protected]>

* Localization change from build: 157736413 (#41621)

Co-authored-by: WSL localization <[email protected]>

* Migrate wslvmservice to WSL

* tests + address missing functionality from initial poc

* Retry OpenVMM named-pipe connections during startup

* Use AF_UNIX for OpenVMM RPC connections

* Add more robust RPC handling + tests

* add tracing

* Revert RPC robustness and tracing changes

Reverts 260080d (add tracing) and ff9c777 (Add more robust RPC handling + tests), restoring the RPC layer to eb59238.

Co-authored-by: Copilot <[email protected]>

* Restore RPC robustness and tracing changes

Reverts ea86585 to restore the original RPC handling, tests, and tracing.

Co-authored-by: Copilot <[email protected]>

* re-do tests

* Update packaging

* undo unnecessary change

* CMake simplify, address copilot comments, run formatter, and make ci changes

* feedback

* Remove unintended localization changes

Restore localized resources to their feature/openvmm versions so they are not included in the OpenVMM RPC change.

Co-authored-by: Copilot <[email protected]>

* use nuget instead

* missed a couple of updates

* .

* Stop tracking local OpenVMM notes

Co-authored-by: Copilot <[email protected]>

* last set of reverted changes

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Blue <[email protected]>
Co-authored-by: WSL localization <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Introduce virtual machine backend interface (#41663)

* Initial work

* .

* flatten

* previous PR feedback

* Update cleanup logic in OpenVmmVirtualMachineBackend

Replaced file deletion with recursive directory removal for improved error handling.

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Initial work

* previous PR feedback

* feedback

* Remove accidentally committed file

* .

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Implement OpenVMM backend (#41697)

* Implement OpenVMM virtual machine backend

Co-authored-by: Copilot <[email protected]>

* .

* fix

* feedback

* feedback

---------

Co-authored-by: Copilot <[email protected]>

* Introduce HcsVirtualMachineBackend (#41718)

* Initial work

* .

* flatten

* previous PR feedback

* Update cleanup logic in OpenVmmVirtualMachineBackend

Replaced file deletion with recursive directory removal for improved error handling.

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* logging improvements + use wsl error codes where applicable + tests

* Configure OpenVMM networking at VM creation time

Expose effective VM descriptions and reject unsupported network configuration and adapter hot-add. Update backend coverage for creation-time networking.

* Refactor + fix locking story

* add user token

* Partially implemented HcsVirtualMachineBackend

* Implement OpenVMM virtual machine backend

Co-authored-by: Copilot <[email protected]>

* .

* fix

* feedback

* Relocate virtual machine backends to common

Co-authored-by: Copilot <[email protected]>

* restore

* 2a03975

* 7c9c0db

* finally rebased

* .

* HcsAttachDisk

* HcsDetachDisk

* tests

* test fixes

* missed some things during merge

* Feedback

* Address HCS backend review feedback

Co-authored-by: Copilot <[email protected]>

* feedback

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Implement remaining HCS VirtualMachineBackend surface (#41761)

* .

* .

* .

* Add filesystem share test

* Fix rebased filesystem share validation

* Remove file share

* initial work

* GPU/PMem

* guest DMA/swiotb, memory configuration, HCS hosted p9 support, shared memory device

* Fix VM backend and WinRT unity build collisions

Port the shared VM constants and explicit WinRT imports from hcs-integration commits 3d53df3 and 1cee239.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: 563f9b88-0149-48a5-ac0c-07d6f0adbd9e

* streamline comments

* Revert streamline comments

* feedback

* feedback

* .

* Align VM termination with existing code

* feedback

---------

Copilot-Session: 563f9b88-0149-48a5-ac0c-07d6f0adbd9e

* Integrate HcsVirtualMachineBackend into WslCoreVm (#41824)

* .

* .

* .

* Add filesystem share test

* Fix rebased filesystem share validation

* Remove file share

* initial work

* GPU/PMem

* guest DMA/swiotb, memory configuration, HCS hosted p9 support, shared memory device

* Fix VM backend and WinRT unity build collisions

Port the shared VM constants and explicit WinRT imports from hcs-integration commits 3d53df3 and 1cee239.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: 563f9b88-0149-48a5-ac0c-07d6f0adbd9e

* streamline comments

* Revert streamline comments

* feedback

* feedback

* .

* Align VM termination with existing code

* test new rs_prerelease image

* formatter

* Integrate HCS virtual machine backend

(cherry picked from commit 5207c4c)

* updates

(cherry picked from commit 21bab9c)

* formatter

(cherry picked from commit 5a6f3e1)

* Merge user/damanmulye/hcs-fs-devices into user/damanmulye/hcs-integration

(cherry picked from commit 721cc2b)

* Remove duplicate state

(cherry picked from commit 32e8ca1)

* More duplicate state removal

(cherry picked from commit a43e9e0)

* test fixes

(cherry picked from commit eaaa885)

* Fix leak for wsldevicehostproxy

(cherry picked from commit 49ba11e)

* Fix merge inconsistencies in the VM backend integration

Reconcile HcsVirtualMachineBackend with the current nested VmResource
model and the termination-information interface:

- Access inherited resource descriptions directly and backend-only
  state through .Backend.
- Drop the duplicate VmFileSystemShare description from
  HcsFileSystemShare, which VmResource already provides.
- Resolve shared-handle versus raw HANDLE conversions for file system
  device and share tokens.
- Store port bindings as VmPortBinding and read the network adapter
  resource path from backend state.
- Restore the SmallPageMemory feature and its HCS capability detection.
- Move WslCoreVm off the obsolete crash/exit APIs to
  GetTerminationReason().

* recover fixes

* .

* .

* .

* Format HCS virtual machine backend

* Only pass a user token for HCS-hosted Plan 9 shares that request root identity

Passing the token unconditionally implicitly set UseShareRootIdentity on GPU shares, changing their flags from ReadOnly|AllowOptions (0x21) to 0x31 and causing the guest /gpu_drivers mount to fail with EINVAL during distro import.

* .

* feedback

* termination feedback

* .

* feedback

---------

Copilot-Session: 563f9b88-0149-48a5-ac0c-07d6f0adbd9e

* Merge latest main branch into feature/openvmm (#41952)

* repo: modify CODEOWNERS to change wsl-maintainers to wsl-reviewers team (#41617)

Co-authored-by: Ben Hillis <[email protected]>

* Localization change from build: 157736413 (#41621)

Co-authored-by: WSL localization <[email protected]>

* CLI: Global option scopes for nested commands (related to compose support) (#41546)

* Change default relay  buffer size to 64KiB (#41603)

The current logic uses a fixed 4KiB buffer for stdio relay on the Windows side. And uses an initial 4KiB buffer for stdio relay on the Linux side, which grows only if the message won't fit. This can severely limit the relay performance in some situations. For example, in #41572, when redirecting stdout to a SMB share.

This PR increases thedefault relay buffer size to 64KiB. Which shows significant performance improvements according to buffer size tests.

* Fix redirect stdout and stderror to the same file overlapping (#41611)

Currently the stdout and stderr relay tracks the output offset separately. And when redirected to the same file, the writes could overlap.

This PR uses the append mode for overlap io writes instead of the separate offsets in the relay. So, the file write offset is correctly tracked by the system.

* move installer log collection after repro (#41620)

The installer log files were collected before the log collection starts. Which will miss the user repro.

This PR moves it after the user repro.

* wslc: add --digests to image list for docker parity (#41457)

Co-authored-by: Copilot <[email protected]>

* Localization change from build: 157843092 (#41630)

Co-authored-by: WSL localization <[email protected]>

* Explicitely return SOCKET from WSLCPluginAPI_ProcessGetFd() (#41626)

* In mirrored mode, handle route update as add instead of replace (#41391)

In mirrored mode, handle route update as add instead of replace
Remove usage of route update as it can overwrite routes on other interfaces. add tests that verify host routing changes are correctly reflected in Linux

---------

Co-authored-by: Catalin-Emil Fetoiu <[email protected]>

* Add wslc events command (#41608)

* Don't fail the UnitTests::Warnings test case if GlobalSecureAccess VPN is running (#41638)

* Don't fail the UnitTests::Warnings test case if GlobalSecureAccess VPN is running

* Cleanup diff

* Fix test

* Wait for wslservice to be started when running tests (#41639)

* Wait for wslservice to be started when running tests

* Fail on timeout

* Improve check

* Format

* Create new namespaces for distro cgroups (#41512)

In 2.9.8, the distro processes are separated into their own cgroups. But they remain in the same cgroup namespace. That caused compatibility issues with softwares that assume a fixed systemd cgroup layout. For example, rootless docker and nerdctl.
Fixes on Moby and nertctl are being worked on. However, to avoid issues with other software, WSL's cgroup handling should also be improved.

This PR creates new cgroup namespaces for the distros. So, to the non-critical distro processes, the systemd cgroup layout stays the same as before.
This PR also introduces a cgroup structure change to accomplish this. The systemd init is moved from wsl-user/distro-N/systemd to wsl-user/distro-N. And the initialization of the distro-N controllers is handled by systemd instead.
The processes are also moved into the non-systemd cgroup in systemdless distros. This makes sure that sub-group controllers can be enabled in the distro root.
Cgroup v2 is now enforced when distro isolation is enabled. Instead of constructing an unusable cgroup v1 layout when cgroup v1 and distro isolation are both enabled.

* Fix unnecessary delay in the port tracking loop (#41472)

Before this change, an additional 10ms delay was added in the port tracker loop presumably to make the main loop slower than the worker loop. So, the worker result does not get super dated. This is not reliable. And the 10ms delay also slows down every consecutive bind call.

This PR refactors the thread synchronization method. So, the timing between those two loops is more deterministic. And removes the performance penalty for all bind calls.

* Localization change from build: 157954210 (#41643)

Co-authored-by: WSL localization <[email protected]>

* wslc: add --follow-link to cp (#41501)

Co-authored-by: Copilot <[email protected]>

* Disable unstable bind cap test and re-enable Loopback test that was incorrectly disabled- #41648 (#41648)

Co-authored-by: Catalin-Emil Fetoiu <[email protected]>

* Move objects shared by wslc.exe and the tests to src/windows/common (#41619)

* Move objects shared by wslc.exe and the tests to src/windows/common

Co-authored-by: Copilot <[email protected]>

* Link yaml-cpp, advapi32 and Crypt32 into common

Co-authored-by: Copilot <[email protected]>

* Drop yaml-cpp, advapi32 and crypt32 from wslclib now that common provides them

Co-authored-by: Copilot <[email protected]>

* Move wslc code in common under common/wslc and namespace CLI types as wslc::cli

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix various protocol parsing issues (#41637)

* Save state

* Use proper arrays

* Format

* Add new tests

* Cleanup tests

* Cleanup diff

* Format

* Apply PR feedback

* Apply PR feedback

* Format

* Apply PR feedback

* Move logging call

* Apply PR feedback

* Apply PR feedback

* Localization change from build: 157980831 (#41647)

Co-authored-by: WSL localization <[email protected]>

* Add WSLC network lifecycle events (#41576)

* Add WSLC network lifecycle events

* Localize pending network prune errors

* Fix network operation wait ownership and cleanup ordering

* Fix prune event correlation after timed-out

* Fix network event rollback and timeout recovery

* Format

* Forward Docker network events directly

* Restore lock_guard after removing event waits

* fix test

* align event stream test helpers after merge

* feedback

* Fix potential out of bound access when pretty-printing string field in init messages (#41664)

* Localization change from build: 158197536 (#41662)

Co-authored-by: WSL localization <[email protected]>

* simplify event reader cleanup and remove unused include (#41667)

* Fix ipv4 forwarding when both v4 and v6 ports are listening

* Fix config's handling of non-ascii characters (#41657)

When parsing the config file, non-ascii utf-16 values are casted into char. This will mangle non-ascii values in the config file. For example, a custom kernel path containing Chinese characters will cause WSL_E_CUSTOM_KERNEL_NOT_FOUND.

This PR removes the faulty static cast and stores the config value in wstring instead of string. So non-ascii values are preserved.

* Prevent potential invalid access for string array pretty print (#41673)

* resolve comments (#41642)

This is a follow up to PR #41512

Remove the redundant restore cgroup namespace code.
Simplify the cgroup check logic by moving the retry inside the debug shell.
Add a new systemd boot timeout test.

* Use a static CRT in debug builds (#41684)

* Fix potential test failure in BrokenDistroImport by not assuming the disk's block device in WSL (#41686)

* Update releaseScripts reference from v1 to v2 (#41687)

* INcrease the VM termination timeout to 30 seconds (#41688)

* Impersonate the caller before making various filesystem operations (#41689)

* Impersonate the caller before making various filesystem operations

* Apply PR feedback

* Support STDIN through SDK (#41698)

* stdin flag

* add winrt test, fix coroutine bug in streams

* Followup to STDIN PR (#41703)

* Add ability to format your branch (#41699)

* Remove references to WSLC being in a preview (#41704)

* Don't write to the install log file if it's a reparse point (#41705)

* Use the latest ESRP signing key code (#41640)

* Use the latest ESRP signing key code

* Only change key code

* Restore original pipeline line endings

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Refactor event stream cancellation waits (#41696)

* Don't expect the brd module logline to stabilize the CustomDmesgOutput test case (#41714)

* Use WSL icon for developer docs (#41715)

* Use WSL icon for developer docs

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

* Reuse docs logo as favicon

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3

* Fix: update drvfs gid uid after default uid is set in oobe (#41521)

For a newly installed distro, the drvfs are initially mount as 0:0. And is not updated after oobe sets the default uid. This could cause access issues before the distro is restarted.

This PR updates the auto mounted drvfs gid uid before completing the oobe. The non-auto mounted shares are not remounted to avoid breaking user set gid uid values.

* Update WSLC SDK API documentation (#41677)

* Update WSLC SDK API documentation

Co-authored-by: Copilot <[email protected]>

* Update docs

* Update docs

* Quick fixes

---------

Co-authored-by: Copilot <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>

* Updated README (#41723)

* Expose kernel headers and perf to distributions (#41400)

* Expose kernel headers and perf to distributions

Mount kernel-matched headers and perf tooling from the artifacts VHD into each distribution, expose perf through the default environment, and cover the resulting paths and replacement behavior.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

* Address kernel artifact review feedback

Correct the documented header target and directory fallback, and log failures while removing mount path environment variables.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5

* Use iterators in FromJson to avoid copies (#41641)

* Use iterators in FromJson to avoid copies

* Cleanup

* Fix template build

* Format

* Use a retry with timeout in HostPortCantBeBoundByGuest (#41728)

* Run the nightly tests on ge-current (#41725)

* Don't fail configuring the consommé loopback adapter when ipv6 is disabled (#41729)

* Enable experimental sparse VHD creation (#41726)

* Refine sparse VHD creation policy

Co-authored-by: Copilot <[email protected]>

* Enable experimental sparse VHD creation in WSL

Co-authored-by: Copilot <[email protected]>

* Make sparse VHD unsafe flag optional

Co-authored-by: Copilot <[email protected]>

* Keep fixed VHD creation non-sparse

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Update Microsoft.RemoteDesktop.Client.MSRDC.SessionHost to version 1.2.7391 (#41730)

Co-authored-by: Ben Hillis <[email protected]>

* Fix WSL container event timestamps (#41717)

* Revert "Enable RedirectionGuard process mitigation" (#41744)

* Revert "Enable RedirectionGuard process mitigation (#41542)"

This reverts commit e53598d.

* Add comments

* Fix comment

* Add --format json to wslc events (#41734)

* Update the DACL to only allow access to the user when creating virtual disks (#41678)

* Update the DACL to only allow access to the user when creating virtual disks

* Save state

* Increase test coverage

* Fix test

* Apply PR feedback

* Apply PR feedback

* Format

* Apply PR suggestions

* Apply PR suggestions

* Clarify container image localization context (#41743)

Add translator guidance distinguishing container images from pictures or photos for the affected WSLC strings.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: 88d3d4b4-5a0e-4d97-9ed4-0fcd856e61de

* Add RLCPlus-9 and RLCPlus-10 (Rocky Linux Plus, CIQ) (#41323)

* Add RLCPlus-9 and RLCPlus-10 (Rocky Linux Plus, CIQ)

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Re-trigger CI: xattr check confirmed clean (no security.selinux attributes found), all four combinations remain boot-tested

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Fix race condition on system distro & init port access (#41762)

* archlinux: Release 2026.10.01.179549 (#41755)

This is an automated release [1].

[1] https://gitlab.archlinux.org/archlinux/archlinux-wsl/-/blob/main/.gitlab-ci.yml

* Enable automatic vNUMA for large WSL VMs (#41741)

* Enable automatic vNUMA for WSL VMs

Add the HCS NUMA topology object so HCS can derive a supported virtual topology for large processor counts instead of requiring WSL to clamp the VM to 256 processors.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Gate automatic vNUMA on Germanium

Preserve the existing single-node HCS configuration on older Windows builds where vNUMA topology creation is unsupported.

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Remove vNUMA test coverage

Co-authored-by: Copilot <[email protected]>

Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

---------

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c

* Exclude wslc.exe and wslcsession.exe from custom LSP providers (#41767)

* Exclude wslc.exe and wslcsession.exe from custom LSP providers

* Include container.exe

* Localization change from build: 159271766 (#41772)

Co-authored-by: WSL localization <[email protected]>

* Reuse EmptyObject for HCS NUMA configuration (#41768)

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Implement container health notifications to wslc events (#41763)

* Save state

* Increase test coverage

* Remove useless state

* Replace TableOutput with TableData model and TableRenderer (#41700)

Co-authored-by: Copilot <[email protected]>

* refactor container cp task to be simpler and move logic to container service and common filesystem helpers (#41668)

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* Use a fallback gateway if no ipv4 gateway is available in consommé networking (#41779)

* Record Docker die and stop events with parity (#41770)

* Save state (#41780)

* Localization change from build: 159357096 (#41786)

Co-authored-by: WSL localization <[email protected]>

* Update issue template for WSLC (#41778)

* Update issue tempalte for WSLC

* Fix description

* Run the nightly tests on Windows Server 2025 (#41760)

* Run the nightly tests on ge-current

* Run the nightly tests on Windows Server 2025

* Skip some network tests

* Update name

* Fix mirrored check

* Use the server field

* Localization change from build: 159470205 (#41800)

Co-authored-by: WSL localization <[email protected]>

* Fix various issues preventing the ModernOOBE test from running multiple times on the same test_distro (#41781)

* Remove unused delay-load options (#41804)

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Disable pushing to the store by default (#41782)

* Scope down the ephemeral port range in various consommé tests (#41805)

* Fix race condition in LifetimeManager (#41807)

* Use DistroFileChange instead of going through wsl.localhost (#41810)

* Explicitely setup impersonation when instanciating IWslSupport (#41815)

* Wait for bound ports to be released by the port relay in the tests (#41817)

* Support reading the wslc image build context from stdin (#41765)

Co-authored-by: Copilot <[email protected]>

* Update Microsoft.WSL.Kernel to 6.18.54.1 (#41822)

* Add logic to reject commands with extra arguments (#41821)

* Add logic to reject commands with extra arguments

* Simplify tests

* Improve wslc event filters (#41809)

* Localization change from build: 159727887 (#41826)

Co-authored-by: WSL localization <[email protected]>

* Make the binfmt mount writable (#41808)

* Make the binfmt mount writeable

* Apply PR suggestions

* Match container and network filters across event types (#41818)

* Fix incorrect wsl.conf warnings being displayed when creating a new distribution (#41820)

* Convert EnsureCaseSensitiveDirectoryRecursive to iterative traversal (#40347)

* Convert EnsureCaseSensitiveDirectoryRecursive to iterative traversal

Replace unbounded recursive depth-first traversal with an iterative
approach using an explicit stack. A deeply nested directory tree could
overflow the thread stack during the recursive calls.

The iterative version collects directories in reverse post-order during
traversal, then marks them bottom-up (children before parents),
preserving the ordering invariant that EnsureCaseSensitiveDirectory
relies on for its early-exit optimization.

Bug: 61964147, 61974992, 61911308, 61463090

Co-authored-by: Copilot <[email protected]>

* Add deep-nesting regression test for case-sensitive recursion

The original recursive EnsureCaseSensitiveDirectoryRecursive could blow
the Windows 1 MB thread stack at a few hundred levels of nesting because
each frame carried a FILE_ID_BOTH_DIR_INFORMATION enumeration buffer.
The iterative implementation in this PR moves that state to the heap, so
a very deep tree must complete without crashing.

The test creates a 1024-level chain via the \\\\?\\ long-path prefix
(cumulative path length exceeds MAX_PATH) and then calls
EnsureCaseSensitiveDirectory on the root. Cleanup goes through the same
long-path prefix so remove_all can see every component.

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Copilot <[email protected]>

* Add publishing to DCAT, nuget to the release pipeline (#41549)

* Add a testpass on rs_base2 (#41832)

* Run the nightly tests on rs_base2

* Update tests for os change

* Update tests

* Localization change from build: 159856815 (#41839)

Co-authored-by: WSL localization <[email protected]>

* Fix the security model link in SECURITY.md (#41835)

#41605 moved the security model to doc/docs/technical-documentation/security.md; the link in SECURITY.md still pointed at doc/docs/security.md.

* Fix RLCPlus distribution manifest formatting (#41841)

Restore canonical JSON indentation without changing distribution data so the distribution validation workflow passes its formatting check.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8

* Update GitPython to resolve Dependabot alerts (#41840)

Upgrade both Python tooling requirement pins to 3.1.62, which fixes all four advisories reported across eight Dependabot alerts.

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8

* Fix CaseSensitivityDeepNesting test build failure (#41849)

Co-authored-by: Copilot <[email protected]>

* Reorganize test/windows into common/, wsl/, and wslc/ (#41661)

* Reorganize test/windows and split WSLCTests.cpp into per-domain files

Co-authored-by: Copilot <[email protected]>

* Split wslc tests into per-layer directories and move common unit tests under common/unit

Co-authored-by: Copilot <[email protected]>

* Flatten test/windows into common/, wsl/, wslc/ and move wslc helpers to common

Co-authored-by: Copilot <[email protected]>

* Port master's WSLC event and network tests into the split test files

Co-authored-by: Copilot <[email protected]>

* Revert WSLCTests.cpp split so the change is file moves only

Co-authored-by: Copilot <[email protected]>

* Update test layout guidance for common/wsl/wslc split

Co-authored-by: Copilot <[email protected]>

* Make CaseSensitivityDeepNesting testDir static constexpr so the lambda can use it

Co-authored-by: Copilot <[email protected]>

* Drop static from CaseSensitivityDeepNesting testDir so it can be captured

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix e2fsck return code 1 treated as failure in resize (#41720)

e2fsck -f -y returns 1 or 2 when there were errors fixed. However, the resize implementation currently only accepts 0 as a success.

This PR adds 1 and 2 to the accepted return codes.

* Document WSL architecture and contributor commands for Copilot (#41843)

Co-authored-by: Copilot <[email protected]>

Co-authored-by: Ben Hillis <[email protected]>
Copilot-Session: 25aa9436-0656-41c8-a222-d81d6414a9e6

* Add WSLC volume events (#41831)

* Fix incorrect AAAA DNS resolution for static DNS records causing resolution failure in musl (#41859)

* Fix race condition causing potential use-after-free in NatNetworking (#41850)

* Acquire m_instanceLock before calling _ValidateDistributionNameAndPathNotInUse() (#41855)

* Acquire m_instanceLock before calling _ValidateDistributionNameAndPathNotInUse

* Cleanup diff

* Cleanup diff

* Make the store publish stage opt-in (#41857)

* Remove the gate before publishing nuget packages, and rename to avoid confusion (#41858)

* Remove the gate before publishing nuget packages, and rename to avoid confusion

* Complete nuget

* Fail bind() requests that fail in Windows (#41856)

* Don't add swiotlb=force with the hv_pci swiotlb pool (#41829)

The hv_pci pool is created with force_bounce set, so virtio devices
bounce through it without the global flag. swiotlb=force only made every
other device, mainly hv_storvsc, bounce all its I/O through the default
64 MB pool, which runs out under load (#41828).

* Fix potential crash caused by error during session initialization (#41887)

* Add a /hyperv to triage hyper-v issues (#41885)

* Localization change from build: 160297307 (#41890)

Co-authored-by: WSL localization <[email protected]>

* Increase the default commited stack size to 64KB (#41888)

* Increase the default commited stack size to 64KB

* Fix formatting of stack size comment in CMakeLists

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

---------

Co-authored-by: Copilot Autofix powered by AI <[email protected]>

* suppress systemctl is-system-running pulling error messages (#41881)

The systemctl is-system-running polling can produce error messages like Failed to connect to bus: No such file or directory before d-bus is ready. And those error messages are duplicated into /dev/kmsg by wsl.

This PR suppresses the error messages as those are not useful for the polling result.

* Disable unsafe move constructors in ScopedRelay (#41897)

* Wait for the drvfs initialization thread to exit before destroying WslCoreVm (#41895)

* Fix potential crash by use-after-free by in the stdin relay thread (#41894)

* Release resources that could call callbacks before returning from HcsVirtualMachine's constructor on failure (#41908)

* Narrow volume event publish ordering comments (#41889)

* Apply clang-format to merged files

Co-authored-by: Copilot <[email protected]>
Copilot-Session: f2cf5bc5-64ce-4bfc-a921-ae7ca379ad64

* Add wslc cp alias for wslc container cp (#41902)

* Add wslc cp alias for wslc container cp

Co-authored-by: Copilot <[email protected]>

* Move wslc cp usage examples under generated usage line with color

Co-authored-by: Copilot <[email protected]>

* Use cp short description key and add cp help example tests

Co-authored-by: Copilot <[email protected]>

* Remove cp help examples

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Fix potential starvation in COMImplClass::Disconnect (#41912)

* Use repository NuGet configuration for out-of-tree builds (#41916)

* Fix a potential use-after-free between plugin calls and WSLCSessionManagerImpl's destruction (#41911)

* Save state

* Simplify reset logic

* Prepare for PR

* Add missing synchronization around load WinHttp proxy methods (#41909)

* Add missing synchronization around load WinHttp proxy methods

* Fix loading logic

* Fix missing synchronization on m_httpProxyStateTracker access (#41907)

* Fix missing synchronization on m_httpProxyStateTracker access

* Update header

* Use the instance lock instead

* Format

* Fix potential deadlock in between VM exit callback and session shutdown (#41910)

* Fix potential deadlock in between VM exit callback and ~LxssUserSessionImpl

* Cleanup diff

* Fix potential use-after-free in EpollWatcher (#41896)

* Match docker -v parsing: LTR spec parser, shared validation, config-v… (#41905)

* Match docker -v parsing: LTR spec parser, shared validation, config-volume anonymous volumes

Co-authored-by: Copilot <[email protected]>

* Reject extra colons in -v mode section

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* Mount bind volumes during cp on non-running containers (#41906)

* Mount bind volumes during cp on non-running containers

Co-authored-by: Copilot <[email protected]>

* Mirror issue repro in bind mount cp test

Co-authored-by: Copilot <[email protected]>

* Throw on deleted container in archive mounts, generate test tar in container

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

* reap sub processes during shutdown to unblock systemd (#41899)

After the cgroup isolation change. The process tree looks like this:
```
init (systemd)                 in the distro cgroup namespace
    init (wsl)                 in the root cgroup namespace
        login                  in the distro cgroup namespace
```
And the poweroff sequence is:

WSL init resets the signal handlers, which sets SIGCHLD to default.
WSL init calls systemctl poweroff
systemd kills processes in it's cgroup namespace like the login process. And skips processes like the wsl init in the root namespace.
The WSL init does not reap the killed sub process. Making it a zombie in the distro namespace.
Systemd waits for the zombie processes and blocks.
The timeout in init finally shutsdown with RB_POWER_OFF.
This could cause the terminate to wait for the timeout and slow down the termination.

This PR adds a waitpid loop that reaps any subprocesses of the WSL init during systemd poweroff. So systemd is no longer stuck by the zombie processes. And it calls BR_POWER_OFF itself to kill the WSL processes in the same PID namespace but in the root cgroup namespace.

* Localization change from build: 160603855 (#41933)

Co-authored-by: WSL localization <[email protected]>

* Fix incorrect srwlock usage in when initializing drvfs (#41925)

* Fix potential deadlock in WSL1 instance termination (#41922)

* Fix potential deadlock in WSL1 instance termination

* Differenciate using instance ids

* Prepare for PR

* Fix potential use-after-free if the WSLC VM is killed while the last session COM reference is being released (#41946)

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Blue <[email protected]>
Co-authored-by: WSL localization <[email protected]>
Co-authored-by: David Bennett <[email protected]>
Co-authored-by: Feng Wang <[email protected]>
Co-authored-by: ggarzia-MSFT <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: FetoiuCatalin <[email protected]>
Co-authored-by: Catalin-Emil Fetoiu <[email protected]>
Co-authored-by: beena352 <[email protected]>
Co-authored-by: Flor Chacón <[email protected]>
Co-authored-by: JohnMcPMS <[email protected]>
Co-authored-by: Keith Horton <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>
Co-authored-by: Patrick Swartz <[email protected]>
Co-authored-by: Copilot Autofix powered by AI <[email protected]>
Co-authored-by: Arch Linux Technical User <[email protected]>
Co-authored-by: Mitchell Levy <[email protected]>
Co-authored-by: Franco Ceballos Rastello <[email protected]>
Co-authored-by: Oleg Tsvetkov <[email protected]>
Co-authored-by: Tuna Birgün <[email protected]>
Copilot-Session: ce78a21f-e946-4e9c-b2ea-934a5b0935f3
Copilot-Session: cdebc331-ad3e-492e-9591-c25587c859c5
Copilot-Session: 88d3d4b4-5a0e-4d97-9ed4-0fcd856e61de
Copilot-Session: ea0c67c5-0211-479b-a7b5-59aebb19b71c
Copilot-Session: aa251cac-d075-47a8-8757-92e013a714d8
Copilot-Session: 25aa9436-0656-41c8-a222-d81d6414a9e6
Copilot-Session: f2cf5bc5-64ce-4bfc-a921-ae7ca379ad64

* address previous feedback

* .

* Feedback

* lifetime/callback cleanup

* Address the rest of feedbac

* Address feedback

* feedback

* Feedback

* feedback

* Remove devicehostproxy changes

* Validate boot disk read access before granting VM access

Restore the original validation order so a best-effort HCS access-grant failure cannot contaminate the read-access error context.

Co-authored-by: Copilot <[email protected]>

* Preserve disk state when VM termination fails

Propagate HCS termination failures before beginning resource cleanup. Only restore attached disks and publish shutdown completion after termination succeeds or exit has already been reported.

Co-authored-by: Copilot <[email protected]>

* feedback

* test fix

* feedback

* Eliminate potential race in terminate()

* Remove redundant common include directory

---------

Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Ben Hillis <[email protected]>
Co-authored-by: Blue <[email protected]>
Co-authored-by: WSL localization <[email protected]>
Co-authored-by: Copilot <[email protected]>
Co-authored-by: Copilot Autofix powered by AI <[email protected]>
Co-authored-by: David Bennett <[email protected]>
Co-authored-by: Feng Wang <[email protected]>
Co-authored-by: ggarzia-MSFT <[email protected]>
Co-authored-by: FetoiuCatalin <[email protected]>
Co-authored-by: Catalin-Emil Fetoiu <[email protected]>
Co-authored-by: beena352 <[email protected]>
Co-authored-by: Flor Chacón <[email protected]>
Co-authored-by: JohnMcPMS <[email protected]>
Co-authored-by: Keith Horton <[email protected]>
Co-authored-by: Craig Loewen <[email protected]>
Co-authored-by: Patrick Swartz <[email protected]>
Co-authored-by: Arch Linux Technical User <[email protected]>
Co-authored-by: Mitchell Levy <[email protected]>
Co-authored-by: Franco Ceballos Rastello <[email protected]>
Co-authored-by: Oleg Tsvetkov <[email protected]>
Co-authored-by: Tuna Birgün <[email protected]>
Co-authored-by: Daman Mulye <[email protected]>
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Ben Hillis (benhillis) added a commit that referenced this pull request Nov 10, 2026
@benhillis @chemwolf6922
@OneBlue @florelis @JohnMcPMS @keith-horton @beena352 Ben Hillis @craigloewen-msft @pswartzclan @archlinux-github @49081 @ggarzia-MSFT @dkbennett @chessturo @xThreeh @Hekzory @tunabirgun @kvega005 Kevin Vega @metajack Jack Moffitt @licon4812 Feng Wang (from Dev Box) @davidcristian @niedong @AmelBawa-msft @sbradnick @jeremycline @FetoiuCatalin Catalin-Emil Fetoiu Daman Mulye @afscrome @mfrw Carla Pérez Gavilán Del Castill
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