New submission from Michał Górny <mgo...@gentoo.org>:
So I've finally found time to bisect this.
Long story short, test_ctypes started hanging on Gentoo package builds since
3.10.0a2. Previously, the test took less than a second. Now, it just keeps
running for minutes until I kill it.
The weird thing is that I can't reproduce it when running it manually. I've
tried hard to rebuild Portage-like environment to make it hang, to no avail.
I've finally gotten around to bisecting it, and established that the problem is
caused by the following change:
```
commit 976da903a746a5455998e9ca45fbc4d3ad3479d8
Author: Alexey Izbyshev <izbys...@ispras.ru>
Date: 2020-10-24 02:47:01 +0200
bpo-35823: subprocess: Use vfork() instead of fork() on Linux when safe
(GH-11671)
[...]
```
After running the test with a timeout, I get the following backtrace:
```
test_issue_8959_a (ctypes.test.test_callbacks.SampleCallbacksTestCase) ...
Timeout (0:00:30)!
Thread 0x00007f72f2507740 (most recent call first):
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/subprocess.py",
line 1773 in _execute_child
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/subprocess.py",
line 962 in __init__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/ctypes/util.py",
line 289 in _findSoname_ldconfig
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/ctypes/util.py",
line 329 in find_library
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/ctypes/test/test_callbacks.py",
line 183 in test_issue_8959_a
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/case.py",
line 549 in _callTestMethod
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/case.py",
line 592 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/case.py",
line 652 in __call__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 122 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 84 in __call__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 122 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 84 in __call__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 122 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 84 in __call__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 122 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 84 in __call__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 122 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/suite.py",
line 84 in __call__
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/unittest/runner.py",
line 176 in run
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/support/__init__.py",
line 959 in _run_suite
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/support/__init__.py",
line 1082 in run_unittest
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/runtest.py",
line 211 in _test_module
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/runtest.py",
line 236 in _runtest_inner2
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/runtest.py",
line 272 in _runtest_inner
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/runtest.py",
line 155 in _runtest
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/runtest.py",
line 195 in runtest
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/main.py",
line 319 in rerun_failed_tests
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/main.py",
line 696 in _main
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/main.py",
line 639 in main
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/libregrtest/main.py",
line 717 in main
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/test/__main__.py",
line 2 in <module>
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/runpy.py",
line 87 in _run_code
File
"/var/tmp/portage/dev-lang/python-3.10.0_alpha6/work/Python-3.10.0a6/Lib/runpy.py",
line 197 in _run_module_as_main
make: *** [Makefile:1204: test] Error 1
```
I'd appreciate any help in debugging this further.
----------
components: Tests
messages: 388014
nosy: izbyshev, mgorny
priority: normal
severity: normal
status: open
title: test_ctypes hangs inside Portage build env since 'subprocess: Use
vfork() instead of fork() [...]'
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43386>
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