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pipe test failures on some Linux configurations  #95672

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pipe test failures on some Linux configurations #95672
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corona10hyeongyun0916
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3.10 (EOL)end of life3.11only security fixes3.12only security fixestestsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error

Description

@colesbury
colesbury
opened on Aug 4, 2022

Bug report

On Linux systems, when configured with a default pipe capacity of 4096, the following test fail:

  • test_fcntl.test_fcntl_f_pipesize
  • test_subprocess.test_pipesizes

From a recent fcntl(2) Linux man page:

F_SETPIPE_SZ:
...
Attempts to set the pipe capacity below the page size are silently rounded up to the page size.

There's a check that attempts to skip the tests if the pipe capacity is 512 bytes, but that's less than the smallest page size on x86.

Since this feature appears to be Linux specific, the check should:

  1. Use os.sysconf('SC_PAGESIZE') as a minimum
  2. Fix the typos ("SkitTest") in test_fcntl_f_pipesize and test_pipesizes

Linked PRs

Activity

  1. colesbury
    added
    type-bugAn unexpected behavior, bug, or error
    testsTests in the Lib/test dir
    3.11only security fixes
    3.10 (EOL)end of life
    3.12only security fixes
    on Aug 4, 2022
  2. corona10
    self-assigned this
    on Feb 18, 2023

  3. corona10 commented on Feb 18, 2023

    @corona10
    corona10
    on Feb 18, 2023
    Member

    Same as #95675 (comment)
    I will introduce this issue into the internal OSS sprint as the good first bug.
    I will delegate the issue to my mentees.
    Thank you for understanding!

  4. hyeongyun0916 commented on Feb 20, 2023

    @hyeongyun0916
    hyeongyun0916
    on Feb 20, 2023
    Contributor

    I'm looking this issue 👀

  5. corona10
    assigned
    hyeongyun0916
    on Feb 20, 2023
  6. corona10
    added a commit that references this issue on Feb 21, 2023

    gh-95672 fix typo SkitTest to SkipTest (gh-102119)

    d5c7954
  7. miss-islington
    added 2 commits that reference this issue on Feb 21, 2023

    pythongh-95672 fix typo SkitTest to SkipTest (pythongh-102119)

    bbe277e

    pythongh-95672 fix typo SkitTest to SkipTest (pythongh-102119)

    d3f8606
  8. corona10
    added 2 commits that reference this issue on Feb 22, 2023

    [3.11] gh-95672 fix typo SkitTest to SkipTest (gh-102119) (#102121)

    5d47150

    [3.10] gh-95672 fix typo SkitTest to SkipTest (gh-102119) (gh-102122)

    bac3fe7
  9. carljm
    added a commit that references this issue on Feb 23, 2023

    Merge branch 'main' into lockfreecp

    b257a16
  10. corona10
    added 2 commits that reference this issue on Mar 1, 2023

    gh-95672 skip fcntl when pipesize is smaller than pagesize (gh-102163)

    2f62a5d

    gh-95672: Update memory_watchdog to use test.support.get_pagesize (gh…

    6059743

  11. corona10 commented on Mar 2, 2023

    @corona10
    corona10
    on Mar 2, 2023
    Member

    @hyeongyun0916 Thanks for the hardwork!

  12. corona10
    closed this as completedon Mar 2, 2023
  13. corona10
    added a commit that references this issue on Mar 6, 2023

    gh-95672: Fix versionadded indentation of get_pagesize in test.rst (g…

    d3ca042
  14. carljm
    added 2 commits that reference this issue on Mar 6, 2023

    Merge branch 'main' into nodeaddict

    33dda2a

    Merge branch 'main' into inlinecomp2

    ecb313c
  15. python-sidebar
    added 2 commits that reference this issue on Sep 1, 2024

    pythongh-95672 fix typo SkitTest to SkipTest (pythongh-102119)

    8ac8bdd

    pythongh-95672 fix typo SkitTest to SkipTest (pythongh-102119)

    da08f1d
  16. JelleZijlstra
    added a commit that references this issue on Sep 10, 2024

    pythongh-95672 fix typo SkitTest to SkipTest (pythongh-102119)

    065e45d
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3.10 (EOL)end of life3.11only security fixes3.12only security fixestestsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error

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