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Title: data race when resizing unicode objects · Issue #132070 · python/cpython · GitHub

Open Graph Title: data race when resizing unicode objects · Issue #132070 · python/cpython

X Title: data race when resizing unicode objects · Issue #132070 · python/cpython

Description: When running ctypes tests in parallel, the following data race is detected: env TSAN_OPTIONS="suppressions=Tools/tsan/suppressions_free_threading.txt halt_on_error=1" ./python -m test test_ctypes --parallel-threads 4 ================== W...

Open Graph Description: When running ctypes tests in parallel, the following data race is detected: env TSAN_OPTIONS="suppressions=Tools/tsan/suppressions_free_threading.txt halt_on_error=1" ./python -m test test_ctypes -...

X Description: When running ctypes tests in parallel, the following data race is detected: env TSAN_OPTIONS="suppressions=Tools/tsan/suppressions_free_threading.txt halt_on_error=1" ./python -m test tes...

Opengraph URL: https://github.com/python/cpython/issues/132070

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(BuildId: cd844f32564aba7a2b18bdb1e258a78c397c8ebc)\n    #11 calcsize /home/realkumaraditya/cpython/./Modules/clinic/_struct.c.h:266:10 (_struct.cpython-314t-x86_64-linux-gnu.so+0x4ac7) (BuildId: cd844f32564aba7a2b18bdb1e258a78c397c8ebc)\n    #12 _PyEval_EvalFrameDefault /home/realkumaraditya/cpython/Python/generated_cases.c.h:2225:35 (python+0x3fef50) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #13 _PyEval_EvalFrame /home/realkumaraditya/cpython/./Include/internal/pycore_ceval.h:119:16 (python+0x3f7150) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #14 _PyEval_Vector /home/realkumaraditya/cpython/Python/ceval.c:1908:12 (python+0x3f7150)\n    #15 _PyFunction_Vectorcall /home/realkumaraditya/cpython/Objects/call.c (python+0x1f1cdf) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #16 _PyObject_VectorcallTstate /home/realkumaraditya/cpython/./Include/internal/pycore_call.h:169:11 (python+0x1f66b0) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    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(python+0x1f1cdf) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #25 _PyObject_VectorcallTstate /home/realkumaraditya/cpython/./Include/internal/pycore_call.h:169:11 (python+0x1f65ff) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #26 method_vectorcall /home/realkumaraditya/cpython/Objects/classobject.c:72:20 (python+0x1f65ff)\n    #27 _PyVectorcall_Call /home/realkumaraditya/cpython/Objects/call.c:273:16 (python+0x1f196f) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #28 _PyObject_Call /home/realkumaraditya/cpython/Objects/call.c:348:16 (python+0x1f196f)\n    #29 PyObject_Call /home/realkumaraditya/cpython/Objects/call.c:373:12 (python+0x1f19d5) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #30 thread_run /home/realkumaraditya/cpython/./Modules/_threadmodule.c:353:21 (python+0x5998d2) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #31 pythread_wrapper /home/realkumaraditya/cpython/Python/thread_pthread.h:242:5 (python+0x4f4157) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n\n  Previous write of size 8 at 0x7f1b0a230680 by thread T1321:\n    #0 __tsan_memcpy \u003cnull\u003e (python+0xdd10f) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #1 _mi_memcpy /home/realkumaraditya/cpython/./Include/internal/mimalloc/mimalloc/internal.h:929:3 (python+0x2af9bf) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #2 _mi_heap_realloc_zero /home/realkumaraditya/cpython/Objects/mimalloc/alloc.c:745:7 (python+0x2af9bf)\n    #3 mi_heap_realloc /home/realkumaraditya/cpython/Objects/mimalloc/alloc.c:753:10 (python+0x2cce30) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #4 _PyObject_MiRealloc /home/realkumaraditya/cpython/Objects/obmalloc.c:276:12 (python+0x2cce30)\n    #5 PyObject_Realloc /home/realkumaraditya/cpython/Objects/obmalloc.c:1416:12 (python+0x2cfc12) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #6 resize_compact /home/realkumaraditya/cpython/Objects/unicodeobject.c:1178:31 (python+0x359915) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #7 _PyUnicodeWriter_Finish /home/realkumaraditya/cpython/Objects/unicodeobject.c:14157:16 (python+0x33162a) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #8 PyUnicode_Format /home/realkumaraditya/cpython/Objects/unicodeobject.c:15361:12 (python+0x35e728) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #9 unicode_mod /home/realkumaraditya/cpython/Objects/unicodeobject.c:14332:12 (python+0x36df71) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #10 binary_op1 /home/realkumaraditya/cpython/Objects/abstract.c:964:13 (python+0x1bdb83) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #11 binary_op /home/realkumaraditya/cpython/Objects/abstract.c:1003:24 (python+0x1be2a8) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #12 PyNumber_Remainder /home/realkumaraditya/cpython/Objects/abstract.c:1187:1 (python+0x1be2a8)\n    #13 _PyEval_EvalFrameDefault /home/realkumaraditya/cpython/Python/generated_cases.c.h:62:35 (python+0x3f7ae5) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #14 _PyEval_EvalFrame /home/realkumaraditya/cpython/./Include/internal/pycore_ceval.h:119:16 (python+0x3f7150) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #15 _PyEval_Vector /home/realkumaraditya/cpython/Python/ceval.c:1908:12 (python+0x3f7150)\n    #16 _PyFunction_Vectorcall /home/realkumaraditya/cpython/Objects/call.c (python+0x1f1cdf) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #17 _PyObject_VectorcallTstate /home/realkumaraditya/cpython/./Include/internal/pycore_call.h:169:11 (python+0x1f66b0) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #18 method_vectorcall /home/realkumaraditya/cpython/Objects/classobject.c:94:18 (python+0x1f66b0)\n    #19 _PyVectorcall_Call /home/realkumaraditya/cpython/Objects/call.c:273:16 (python+0x1f196f) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #20 _PyObject_Call /home/realkumaraditya/cpython/Objects/call.c:348:16 (python+0x1f196f)\n    #21 PyObject_Call /home/realkumaraditya/cpython/Objects/call.c:373:12 (python+0x1f19d5) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #22 _PyEval_EvalFrameDefault /home/realkumaraditya/cpython/Python/generated_cases.c.h:2411:32 (python+0x3ff399) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #23 _PyEval_EvalFrame /home/realkumaraditya/cpython/./Include/internal/pycore_ceval.h:119:16 (python+0x3f7150) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #24 _PyEval_Vector /home/realkumaraditya/cpython/Python/ceval.c:1908:12 (python+0x3f7150)\n    #25 _PyFunction_Vectorcall /home/realkumaraditya/cpython/Objects/call.c (python+0x1f1cdf) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #26 _PyObject_VectorcallTstate /home/realkumaraditya/cpython/./Include/internal/pycore_call.h:169:11 (python+0x1f65ff) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #27 method_vectorcall /home/realkumaraditya/cpython/Objects/classobject.c:72:20 (python+0x1f65ff)\n    #28 _PyVectorcall_Call /home/realkumaraditya/cpython/Objects/call.c:273:16 (python+0x1f196f) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #29 _PyObject_Call /home/realkumaraditya/cpython/Objects/call.c:348:16 (python+0x1f196f)\n    #30 PyObject_Call /home/realkumaraditya/cpython/Objects/call.c:373:12 (python+0x1f19d5) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #31 thread_run /home/realkumaraditya/cpython/./Modules/_threadmodule.c:353:21 (python+0x5998d2) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n    #32 pythread_wrapper /home/realkumaraditya/cpython/Python/thread_pthread.h:242:5 (python+0x4f4157) (BuildId: 27b79e16bbd11b196a3f4a8232b4b09ecf4e18ee)\n\n```\n\n\n\n\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-132091\n* gh-132468\n* gh-133039\n* gh-133121\n* gh-133126\n* gh-143441\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/kumaraditya303","@type":"Person","name":"kumaraditya303"},"datePublished":"2025-04-04T11:49:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/132070/cpython/issues/132070"}
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og:image:altWhen running ctypes tests in parallel, the following data race is detected: env TSAN_OPTIONS="suppressions=Tools/tsan/suppressions_free_threading.txt halt_on_error=1" ./python -m test test_ctypes -...
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data race when resizing unicode objectshttps://github.com/python/cpython/issues/132070#top
interpreter-core(Objects, Python, Grammar, and Parser dirs)https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22interpreter-core%22
topic-free-threadinghttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22topic-free-threading%22
topic-unicodehttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22topic-unicode%22
type-bugAn unexpected behavior, bug, or errorhttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22type-bug%22
https://github.com/kumaraditya303
kumaraditya303https://github.com/kumaraditya303
on Apr 4, 2025https://github.com/python/cpython/issues/132070#issue-2972140701
gh-132070: use _PyObject_IsUniquelyReferenced in unicodeobject #132091https://github.com/python/cpython/pull/132091
gh-132070: add PyObject_Realloc suppression in free-threading #132468https://github.com/python/cpython/pull/132468
gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject #133039https://github.com/python/cpython/pull/133039
[3.13] gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject (gh-133039) #133121https://github.com/python/cpython/pull/133121
[3.13] gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject (gh-133039) #133126https://github.com/python/cpython/pull/133126
gh-132070: Fix PyObject_Realloc thread-safety in free threaded Python #143441https://github.com/python/cpython/pull/143441
interpreter-core(Objects, Python, Grammar, and Parser dirs)https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22interpreter-core%22
topic-free-threadinghttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22topic-free-threading%22
topic-unicodehttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22topic-unicode%22
type-bugAn unexpected behavior, bug, or errorhttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22type-bug%22
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