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GeezerVison is showing github.com — gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED by vstinner · Pull Request #150704 · python/cpython

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@vstinner

@vstinner vstinner commented Jun 1, 2026 •
edited by bedevere-app Bot
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If a subprocess spawned with CREATE_NEW_CONSOLE creation flag fails with STATUS_DLL_INIT_FAILED return code, skip the test. It's likely a memory allocation failure in the desktop heap memory which caused the DLL init failure.

  • Issue: test_cmd_line: test_python_legacy_windows_stdio() fails with STATUS_DLL_INIT_FAILED (hex: c0000142, dec: 3221225794) #150436

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@vstinner
pythongh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED
8aedb12 
If a subprocess spawned with CREATE_NEW_CONSOLE creation flag fails
with STATUS_DLL_INIT_FAILED return code, skip the test. It's likely a
memory allocation failure in the desktop heap memory which caused the
DLL init failure.
@vstinner
vstinner requested a review from gpshead as a code owner June 1, 2026 11:41
@vstinner vstinner added tests Tests in the Lib/test dir OS-windows needs backport to 3.13 only security fixes needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Jun 1, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Jun 1, 2026
test_cmd_line: test_python_legacy_windows_stdio() fails with STATUS_DLL_INIT_FAILED (hex: c0000142, dec: 3221225794) #150436
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@bedevere-app bedevere-app Bot added the awaiting core review label Jun 1, 2026
@vstinner vstinner added the skip news label Jun 1, 2026
vstinner added 2 commits June 1, 2026 13:43
@vstinner
Rename to skip_on_low_desktop_heap_memory_subprocess()
cd3fb79
@vstinner
Add @support.requires_resource('gui')
334f693
@vstinner

vstinner commented Jun 1, 2026

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cc @zooba @chris-eibl
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@vstinner

vstinner commented Jun 1, 2026

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See also articles:

  • https://learn.microsoft.com/en-us/archive/blogs/ntdebugging/desktop-heap-overview
  • https://learn.microsoft.com/en-us/archive/blogs/ntdebugging/desktop-heap-part-2
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@vstinner

vstinner commented Jun 1, 2026

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There was a tool named DHeapMon.exe to monitor the usage of the Desktop Heap Memory, but I failed to find a website to download it. It seems like it's not longer maintained.
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zooba
zooba approved these changes Jun 1, 2026
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@bedevere-app bedevere-app Bot added awaiting merge and removed awaiting core review labels Jun 1, 2026
@chris-eibl
chris-eibl self-requested a review June 1, 2026 14:01
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chris-eibl approved these changes Jun 1, 2026
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@vstinner
Add missing import to test_msvcrt
f607d43
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vstinner enabled auto-merge (squash) June 1, 2026 14:27
@vstinner
vstinner merged commit e8034dd into python:main Jun 1, 2026
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@vstinner
vstinner deleted the desktop_heap_memory branch June 1, 2026 14:50
@miss-islington-app

miss-islington-app Bot commented Jun 1, 2026

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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15.
🐍🍒⛏🤖
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@bedevere-app bedevere-app Bot removed the awaiting merge label Jun 1, 2026
@miss-islington-app

miss-islington-app Bot commented Jun 1, 2026

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Sorry, @vstinner, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker e8034dd841808416e243a4b2f8e08f0edf9caff3 3.14
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@miss-islington-app miss-islington-app Bot assigned vstinner Jun 1, 2026
@miss-islington-app

miss-islington-app Bot commented Jun 1, 2026

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Sorry, @vstinner, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker e8034dd841808416e243a4b2f8e08f0edf9caff3 3.13
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@bedevere-app

bedevere-app Bot commented Jun 1, 2026

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GH-150713 is a backport of this pull request to the 3.15 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Jun 1, 2026
@bedevere-app

bedevere-app Bot commented Jun 1, 2026

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GH-150715 is a backport of this pull request to the 3.14 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Jun 1, 2026
@vstinner vstinner removed the needs backport to 3.13 only security fixes label Jun 1, 2026
vstinner added a commit that referenced this pull request Jun 1, 2026
@vstinner
[3.14] gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (#15…
d5b07a9 
…0704) (#150715)

gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (#150704)

If a subprocess spawned with CREATE_NEW_CONSOLE creation flag fails
with STATUS_DLL_INIT_FAILED return code, skip the test. It's likely a
memory allocation failure in the desktop heap memory which caused the
DLL init failure.

(cherry picked from commit e8034dd)
@bedevere-app

bedevere-app Bot commented Jun 1, 2026

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GH-150721 is a backport of this pull request to the 3.13 branch.
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vstinner added a commit that referenced this pull request Jun 1, 2026
@vstinner
[3.13] gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (#15…
ff9c8de 
…0704) (#150721)

gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (#150704)

If a subprocess spawned with CREATE_NEW_CONSOLE creation flag fails
with STATUS_DLL_INIT_FAILED return code, skip the test. It's likely a
memory allocation failure in the desktop heap memory which caused the
DLL init failure.

(cherry picked from commit e8034dd)
vstinner added a commit that referenced this pull request Jun 4, 2026
@miss-islington @vstinner
[3.15] gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (GH-…
6b46aac 
…150704) (#150713)

gh-150436: Skip subprocess test on STATUS_DLL_INIT_FAILED (GH-150704)

If a subprocess spawned with CREATE_NEW_CONSOLE creation flag fails
with STATUS_DLL_INIT_FAILED return code, skip the test. It's likely a
memory allocation failure in the desktop heap memory which caused the
DLL init failure.
(cherry picked from commit e8034dd)

Co-authored-by: Victor Stinner <[email protected]>
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@zooba zooba zooba approved these changes
@chris-eibl chris-eibl chris-eibl approved these changes
@gpshead gpshead Awaiting requested review from gpshead gpshead is a code owner

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@vstinner vstinner

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@vstinner @zooba @chris-eibl
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