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test_import leaked [1, 1, 6] memory blocks on s390x Fedora Refleaks 3.x #110096
Description
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
vstinner commentedon Oct 5, 2023
Similar failure:
build: https://buildbot.python.org/all/#/builders/562/builds/902
I already saw that test_functools in 2019 and 2020: issue gh-80741.
vstinner commentedon Oct 5, 2023
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 -j1stopped after 5 processes:Patterns like
2, -1, 1, 0, -1, 1,and0, 1, 1can explain why the test "fails" sometimes.vstinner commentedon Nov 8, 2023
I didn't see the issue recently on s390x Fedora Refleaks 3.x. I close the issue.