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test_faulthandler fails randomly on x86-64 MacOS Intel ASAN NoGIL 3.x #159606
Description
x86-64 MacOS Intel ASAN NoGIL 3.x: https://buildbot.python.org/#/builders/1366/builds/8260/steps/5/logs/stdio
(...) test_register_max_threads (test.test_faulthandler.FaultHandlerTests.test_register_max_threads) ... ok test_register_threads (test.test_faulthandler.FaultHandlerTests.test_register_threads) ... ok test_sigabrt (test.test_faulthandler.FaultHandlerTests.test_sigabrt) ... ok test_sigbus (test.test_faulthandler.FaultHandlerTests.test_sigbus) ... Timeout (0:35:00)! Thread 0x00007ff84b416a00 (most recent call first): File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/selectors.py", line 398 in select File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/subprocess.py", line 291 in _communicate_io_posix File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/subprocess.py", line 2436 in _communicate File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/subprocess.py", line 1395 in communicate File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/test/test_faulthandler.py", line 97 in get_output File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/test/test_faulthandler.py", line 159 in check_error File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/test/test_faulthandler.py", line 168 in check_fatal_error File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/test/test_faulthandler.py", line 259 in test_sigbus File "/Users/buildbot/buildarea/3.x.itamaro-macos-intel-aws.macos-with-brew.asan.nogil/build/Lib/unittest/case.py", line 637 in _callTestMethod (...)
Activity
vstinner commented on Oct 17, 2026
The 3.14 and 3.15 branches are also affected.
Example of failure on x86-64 MacOS Intel ASAN NoGIL 3.14: https://buildbot.python.org/#/builders/1729/builds/1754.
vstinner commented on Oct 17, 2026
cc @itamaro
vstinner commented on Oct 17, 2026
test_largefile also fails randomly since 2 days on the same buildbot: #159608.
vstinner commented on Oct 19, 2026
test_faulthandler pass again since @itamaro rebooted the buildbot, so I just closed my PR.