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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_tracemalloc: test_tracemalloc_track_race() crashs on GHA iOS CI","articleBody":"# Crash report\n\niOS: https://github.com/python/cpython/actions/runs/26457870719/job/77897032289?pr=150441\n\nThis issue is likely the same as issue gh-143143, but I'm not 100% sure so I created a separated issue.\n\n```\n    0:11:19 load avg: 2.79 [435/505] test_tracemalloc\n  Fatal Python error: Segmentation fault\n  \n  Current thread 0x0000000322193000 (most recent call first):\n  \n  Thread 0x0000000321187000 (most recent call first):\n  \n  Thread 0x000000032017b000 (most recent call first):\n  \n  (...)\n  \n  Thread 0x00000003100bb000 (most recent call first):\n  \n  \u003cfreed thread state\u003e\n  \n  Current thread's C stack trace (most recent call first):\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at _Py_DumpStack+0x44 [0x102407804]\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at faulthandler_fatal_error+0x264 [0x10241e4a0]\n    Binary file \"/usr/lib/system/libsystem_platform.dylib\", at _sigtramp+0x34 [0x100a6f7e0]\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at PyGILState_Ensure+0xf8 [0x1023eab50]\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at PyGILState_Ensure+0xf8 [0x1023eab50]\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at tracemalloc_alloc+0xa8 [0x1024097a4]\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at PyGILState_Ensure+0x58 [0x1023eaab0]\n    Binary file \"/Users/runner/work/cpython/cpython/cross-build/iOS-testbed.1779809388208/DerivedData/Build/Products/Debug-iphonesimulator/Python.framework/Python\", at PyTraceMalloc_Track+0x34 [0x1024088ec]\n    Binary file \"/Users/runner/Library/Developer/CoreSimulator/Devices/D3F1CE55-196D-4DC8-9D1F-6D2D3AB3D118/data/Containers/Bundle/Application/130788EC-7B24-4534-8FF0-89C57EC65B80/iOSTestbed.app/Frameworks/_testcapi.framework/_testcapi\", at tracemalloc_track_race_thread+0x20 [0x106f251b0]\n    (...)\n  \n  Extension modules: _testcapi, _testinternalcapi, _testlimitedcapi, _testmultiphase, _testbuffer, _ctypes_test, xxsubtype, _testsinglephase_basic_wrapper, _testsinglephase_basic_copy, _testsinglephase_with_reinit, _testsinglephase_with_state, _test_non_isolated, _test_shared_gil_only, _test_no_multiple_interpreter_slot, _testsinglephase (total: 15)\n  \n  Restarting after unexpected exit, crash, or test timeout in -[TestbedTests testPython]; summary will include totals from previous launches.\n```","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2026-05-26T16:11:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/150485/cpython/issues/150485"}