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test_import leaked [1, 1, 6] memory blocks on s390x Fedora Refleaks 3.x #110096

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test_import leaked [1, 1, 6] memory blocks on s390x Fedora Refleaks 3.x#110096
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testsTests in the Lib/test dir

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@vstinner
vstinner
opened on Sep 29, 2023

s390x Fedora Refleaks 3.x:

0:19:28 load avg: 8.18 [406/467/1] test_import failed (reference leak) -- running (2): test.test_multiprocessing_spawn.test_manager (2 min 56 sec), test.test_multiprocessing_spawn.test_processes (3 min 38 sec)
beginning 6 repetitions
123456
......
test_import leaked [1, 1, 6] memory blocks, sum=8

when re-run in verbose mode in a fresh process, regrtest no longer detects a memory leak:

0:24:10 load avg: 3.66 Re-running 1 failed tests in verbose mode in subprocesses
0:24:10 load avg: 3.66 Run 1 test in parallel using 1 worker process (timeout: 3 hour 20 min, worker timeout: 3 hour 25 min)
0:24:24 load avg: 3.30 [1/1] test_import passed
Re-running test_import in verbose mode
beginning 6 repetitions
123456
(...)
OK (skipped=3)
(...)
Result: FAILURE then SUCCESS

build: https://buildbot.python.org/all/#/builders/433/builds/896

Activity

  1. vstinner
    added
    testsTests in the Lib/test dir
    on Sep 29, 2023

  2. vstinner commented on Oct 5, 2023

    @vstinner
    vstinner
    on Oct 5, 2023
    MemberAuthor

    Similar failure:

    test_functools leaked [1, 1, 1] memory blocks, sum=3

    build: https://buildbot.python.org/all/#/builders/562/builds/902

    I already saw that test_functools in 2019 and 2020: issue gh-80741.

  3. vstinner commented on Oct 5, 2023

    @vstinner
    vstinner
    on Oct 5, 2023
    MemberAuthor

    test_functools is not 100% stable in terms of "allocated blocks". Sometimes, one run allocates 2 blocks, blocks which are released later. Dump of Lib/test/libregrtest/refleak.py "alloc_deltas". Ignore the first 3 values which are "warmup" runs":

    ./python -m test test_functools -R 3:10 -F -j1 stopped after 5 processes:

    • alloc_deltas [88192, 6, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    • alloc_deltas [88179, 8, 0, -1, 1, 0, 0, 0, 0, 0, 0, 0, 0]
    • alloc_deltas [88180, 7, 0, 2, -1, 1, 0, -1, 1, 0, 0, 0, 0]
    • alloc_deltas [88180, 7, 0, 0, 0, -1, 0, 1, 0, 0, 0, 1, 1]
    • alloc_deltas [88180, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

    Patterns like 2, -1, 1, 0, -1, 1, and 0, 1, 1 can explain why the test "fails" sometimes.

  4. vstinner commented on Nov 8, 2023

    @vstinner
    vstinner
    on Nov 8, 2023
    MemberAuthor

    I didn't see the issue recently on s390x Fedora Refleaks 3.x. I close the issue.

  5. vstinner
    closed this as completedon Nov 8, 2023
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