Description

vstinner

opened on Dec 12, 2025

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Bug report

Bug description:

Since "Annotate anonymous mmap usage if "-X dev" is used" change (commit), many tests started to fail on Linux buildbots building Python with --enable-shared. I can reproduce the issue on Ubuntu 24.04.

Example AMD64 Ubuntu Shared 3.x: https://buildbot.python.org/all/#/builders/506/builds/11959

5 tests failed:
    test_audit test_external_inspection test_profiling test_remote_pdb
    test_sys

Example:

test_sys_remote_exec (test.test_audit.AuditTest.test_sys_remote_exec) ... FAIL

Stderr:
Fatal Python error: _Py_CheckFunctionResult: a function returned a result with an exception set
Python runtime state: initialized
OSError: Cannot open ELF file '[anon:cpython:pymalloc]' for section 'PyRuntime' search: No such file or directory

The above exception was the direct cause of the following exception:

SystemError: <built-in function remote_exec> returned a result with an exception set

Current thread 0x00007f8388d70b80 [python] (most recent call first):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/audit-tests.py", line 672 in test_sys_remote_exec
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/audit-tests.py", line 761 in <module>

Extension modules: math.integer (total: 1)

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-142627: Ignore anonymous mappings in Linux remote debugging #142628
• [3.14] gh-142627: Ignore anonymous mappings in Linux remote debugging (GH-142628) #142630

Activity

1. vstinner

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   testsTests in the Lib/test dirTests in the Lib/test dir

   on Dec 12, 2025
2. vstinner

   added a commit that references this issue on Dec 12, 2025

   pythongh-142627: Ignore anonymous mappings in Linux remote debugging

   73711a3
3. vstinner commented on Dec 12, 2025

   

   vstinner

   on Dec 12, 2025

   MemberAuthor

   More actions

   Since "Annotate anonymous mmap usage if "-X dev" is used" change (commit)

   It's an issue in remote debugging which tries to locate the memory mapping of libpython by searching for the string "python" in /proc/pid/maps. New mappings such as "[anon:cpython:pymalloc]" are now matching, but there are anonymous mappings, not the libpython we are looking for.

   Note: I cannot reproduce the issue on Fedora, since Fedora builds the Linux kernel without the CONFIG_ANON_VMA_NAME option.
4. vstinner

   added a commit that references this issue on Dec 12, 2025

   gh-142627: Ignore anonymous mappings in Linux remote debugging (#142628)

   e0bca09
5. miss-islington

   added a commit that references this issue on Dec 12, 2025

   pythongh-142627: Ignore anonymous mappings in Linux remote debugging (p…

   54e005a
6. vstinner

   closed this as completedon Dec 12, 2025
7. vstinner

   added a commit that references this issue on Dec 12, 2025

   [3.14] gh-142627: Ignore anonymous mappings in Linux remote debugging (…

   8e49601

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