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test_lazy_import.test_deeply_dotted_name() leaks 19,650 references on PPC64LE CentOS9 #159538

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test_lazy_import.test_deeply_dotted_name() leaks 19,650 references on PPC64LE CentOS9#159538
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testsTests in the Lib/test dirtopic-lazy-importstype-bugAn unexpected behavior, bug, or error

Description

@vstinner
vstinner
opened on Oct 16, 2026

Example on PPC64LE CentOS9 Refleaks 3.x buildbot (I ran the test manually):

$ ./python -m test -R 3:3 test_lazy_import -m test_deeply_dotted_name
...
test_lazy_import leaked [19650, 19650, 19650] references, sum=58950
test_lazy_import leaked [9829, 9829, 9829] memory blocks, sum=29487
...
Result: FAILURE

See also the leak on PPC64LE CentOS9 Refleaks 3.x: https://buildbot.python.org/#/builders/867/builds/3577

Linked PRs

Activity

  1. vstinner
    added
    type-bugAn unexpected behavior, bug, or error
    testsTests in the Lib/test dir
    topic-lazy-imports
    on Oct 16, 2026

  2. StanFromIreland commented on Oct 16, 2026

    @StanFromIreland
    StanFromIreland
    on Oct 16, 2026
    Member

    CC @brittanyrey

  3. vstinner commented on Oct 16, 2026

    @vstinner
    vstinner
    on Oct 16, 2026
    MemberAuthor

    The test was added by #159289.

  4. brittanyrey commented on Oct 16, 2026

    @brittanyrey
    brittanyrey
    on Oct 16, 2026
    Contributor

    Taking a look!

  5. brittanyrey commented on Oct 16, 2026

    @brittanyrey
    brittanyrey
    on Oct 16, 2026
    Contributor

    I put up a fix that adds an explicit call to self.addCleanup. #159576

    There's also another workaround that changes the restricted stack size from 256 -> 512 which should also suffice:

    -    @support.run_with_limited_c_stack(depth=10_000, size=256 * 1024)
+    @support.run_with_limited_c_stack(depth=10_000, size=512 * 1024)
  6. vstinner
    added a commit that references this issue on Oct 17, 2026

    gh-159538: Fix deep chain leak in test_deeply_dotted_name (#159576)

    c84d4b5
  7. vstinner
    closed this as completedon Oct 17, 2026
  8. vstinner
    added a commit that references this issue on Oct 17, 2026

    [3.15] gh-159538: Fix deep chain leak in test_deeply_dotted_name (GH-…

    491ccaf
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