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| og:image:alt | Bug report
Issue: 157841
Type: crash / data race in a free-threaded build
functools.partial mutates its own state from __setstate__() with no
synchronisation against the readers of that state. Un... |
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| Free-threaded CPython 3.14: concurrent functools.partial.__setstate__ crashes with repr(), calls, or another __setstate__ #157841 | https://github.com/python/cpython/issues/157841 |
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| September 21, 2026 18:08 | https://github.com/python/cpython/pull/157979#commits-pushed-1479169 |
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| pythongh-157841 | https://github.com/python/cpython/issues/157841 |
| : Synchronize access to functools.partial's mutable state | https://github.com/python/cpython/pull/157979/commits/14791690daf9763a19f70b50e53d370d40cdf9fe |
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Sep 23, 2026
| https://github.com/python/cpython/pull/157979#ref-issue-5516367783 |
|
Free-threaded CPython 3.14: concurrent functools.partial.__setstate__ crashes with repr(), calls, or another __setstate__
#157841
| https://github.com/python/cpython/issues/157841 |
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awaiting review
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Oct 10, 2026
| https://github.com/python/cpython/pull/157979#ref-issue-5796098873 |
|
Free-threaded 3.15: a functools.partial shared between threads no longer scales (it slows down as you add threads)
#159157
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