[3.12] gh-128679: Fix tracemalloc.stop() race conditions (#128897) #129022
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…n#128897) tracemalloc_alloc(), tracemalloc_realloc(), PyTraceMalloc_Track(), PyTraceMalloc_Untrack() and _PyTraceMalloc_TraceRef() now check tracemalloc_config.tracing after calling TABLES_LOCK(). _PyTraceMalloc_Stop() now protects more code with TABLES_LOCK(), especially setting tracemalloc_config.tracing to 1. Add a test using PyTraceMalloc_Track() to test tracemalloc.stop() race condition. Call _PyTraceMalloc_Init() at Python startup. (cherry picked from commit 6b47499)
This was referenced Jan 19, 2025
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I tested manually my change on FreeBSD with Python built in release mode. I ran test_tracemalloc_track_race() 1,000x in a loop (using |
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tracemalloc_alloc(), tracemalloc_realloc(), PyTraceMalloc_Track(), PyTraceMalloc_Untrack() and _PyTraceMalloc_TraceRef() now check tracemalloc_config.tracing after calling TABLES_LOCK().
_PyTraceMalloc_Stop() now protects more code with TABLES_LOCK(), especially setting tracemalloc_config.tracing to 1.
Add a test using PyTraceMalloc_Track() to test tracemalloc.stop() race condition.
Call _PyTraceMalloc_Init() at Python startup.
(cherry picked from commit 6b47499)