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Title: gh-151218: Fix data race in sys_set_flag for free-threading by bhuvi27 · Pull Request #151220 · python/cpython · GitHub

Open Graph Title: gh-151218: Fix data race in sys_set_flag for free-threading by bhuvi27 · Pull Request #151220 · python/cpython

X Title: gh-151218: Fix data race in sys_set_flag for free-threading by bhuvi27 · Pull Request #151220 · python/cpython

Description: Fixes #151218 Concurrent calls to sys.set_int_max_str_digits() in free-threaded builds could double-free the same sys.flags tuple item because sys_set_flag() updated the slot without synchronization. Protect sys.flags updates with a mutex in free-threaded builds, and hold the same lock across flag and interpreter int_max_str_digits state updates so sys.get_int_max_str_digits() stays consistent with sys.flags. Add a concurrent stress regression test in test_sys.py. Issue: gh-151218

Open Graph Description: Fixes #151218 Concurrent calls to sys.set_int_max_str_digits() in free-threaded builds could double-free the same sys.flags tuple item because sys_set_flag() updated the slot without synchronizatio...

X Description: Fixes #151218 Concurrent calls to sys.set_int_max_str_digits() in free-threaded builds could double-free the same sys.flags tuple item because sys_set_flag() updated the slot without synchronizatio...

Opengraph URL: https://github.com/python/cpython/pull/151220

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