Ref leaks on test_import

./python -m test -R : test_import
0:00:00 load avg: 0.27 Run tests sequentially
0:00:00 load avg: 0.27 [1/1] test_import
beginning 9 repetitions
123456789
.........
test_import leaked [60, 60, 60, 60] references, sum=240
test_import leaked [48, 48, 48, 48] memory blocks, sum=192
test_import failed (reference leak)

== Tests result: FAILURE ==

1 test failed:
    test_import

Total duration: 14.8 sec
Tests result: FAILURE

tested on heads/main:a24e25d74b

This result is also seen in many build bots,

such as

https://buildbot.python.org/all/#/builders/562/builds/838 https://buildbot.python.org/all/#/builders/123/builds/802 https://buildbot.python.org/all/#/builders/562/builds/838 https://buildbot.python.org/all/#/builders/384/builds/829

Linked PRs

bisected to 75c974f #107184

Also, test_disallowed_reimport fails with segfault if we run his with --forever parameter:

cpython % ./python.exe -m test -v  test_import -m test_disallowed_reimport --forever
== CPython 3.13.0a0 (heads/main:3979150a0d, Jul 31 2023, 11:09:08) [Clang 14.0.3 (clang-1403.0.22.14.1)]
== macOS-13.5-arm64-arm-64bit little-endian
== Python build: debug
== cwd: /Users/admin/Projects/cpython/build/test_python_1319æ
== CPU count: 8
== encodings: locale=UTF-8, FS=utf-8
0:00:00 load avg: 1.57 Run tests sequentially
0:00:00 load avg: 1.57 [  1] test_import
test_disallowed_reimport (test.test_import.SubinterpImportTests.test_disallowed_reimport) ... ok

----------------------------------------------------------------------
Ran 1 test in 0.010s

OK
0:00:00 load avg: 1.57 [  2] test_import
test_disallowed_reimport (test.test_import.SubinterpImportTests.test_disallowed_reimport) ... Debug memory block at address p=0x104ad4770: API '�'
    15987178197214944733 bytes originally requested
    The 7 pad bytes at p-7 are not all FORBIDDENBYTE (0xfd):
        at p-7: 0xdd *** OUCH
        at p-6: 0xdd *** OUCH
        at p-5: 0xdd *** OUCH
        at p-4: 0xdd *** OUCH
        at p-3: 0xdd *** OUCH
        at p-2: 0xdd *** OUCH
        at p-1: 0xdd *** OUCH
    Because memory is corrupted at the start, the count of bytes requested
       may be bogus, and checking the trailing pad bytes may segfault.
    The 8 pad bytes at tail=0xdddddddee28b254d are Fatal Python error: Segmentation fault

Current thread 0x00000001ec922080 (most recent call first):
  File "/Users/admin/Projects/cpython/Lib/test/test_import/__init__.py", line 153 in restore__testsinglephase
  File "/Users/admin/Projects/cpython/Lib/test/test_import/__init__.py", line 165 in meth
  File "/Users/admin/Projects/cpython/Lib/unittest/case.py", line 589 in _callTestMethod
  File "/Users/admin/Projects/cpython/Lib/unittest/case.py", line 634 in run
  File "/Users/admin/Projects/cpython/Lib/unittest/case.py", line 690 in __call__
  File "/Users/admin/Projects/cpython/Lib/unittest/suite.py", line 122 in run
  File "/Users/admin/Projects/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/Users/admin/Projects/cpython/Lib/unittest/suite.py", line 122 in run
  File "/Users/admin/Projects/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/Users/admin/Projects/cpython/Lib/unittest/suite.py", line 122 in run
  File "/Users/admin/Projects/cpython/Lib/unittest/suite.py", line 84 in __call__
  File "/Users/admin/Projects/cpython/Lib/unittest/runner.py", line 240 in run
  File "/Users/admin/Projects/cpython/Lib/test/support/__init__.py", line 1115 in _run_suite
  File "/Users/admin/Projects/cpython/Lib/test/support/__init__.py", line 1241 in run_unittest
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/runtest.py", line 294 in _test_module
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/runtest.py", line 330 in _runtest_inner2
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/runtest.py", line 373 in _runtest_inner
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/runtest.py", line 248 in _runtest
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/runtest.py", line 278 in runtest
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/main.py", line 483 in run_tests_sequential
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/main.py", line 621 in run_tests
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/main.py", line 799 in _main
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/main.py", line 758 in main
  File "/Users/admin/Projects/cpython/Lib/test/libregrtest/main.py", line 822 in main
  File "/Users/admin/Projects/cpython/Lib/test/__main__.py", line 2 in <module>
  File "/Users/admin/Projects/cpython/Lib/runpy.py", line 88 in _run_code
  File "/Users/admin/Projects/cpython/Lib/runpy.py", line 198 in _run_module_as_main

Extension modules: _testcapi, _testinternalcapi, _testsinglephase, _testmultiphase, _xxsubinterpreters (total: 5)
zsh: segmentation fault  ./python.exe -m test -v test_import -m test_disallowed_reimport --forever

gh-107471: Fix Refleaks in test_import (gh-107569)

pythongh-107471: Fix Refleaks in test_import (pythongh-107569)

[3.12] gh-107471: Fix Refleaks in test_import (gh-107569) (#107571)

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Ref leaks on test_import #107471

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sunmy2019 commented on Jul 31, 2023

Eclips4 commented on Jul 31, 2023

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Ref leaks on `test_import` #107471