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PyType_Freeze() stopped the world under the type lock without pinning it, so the lock could be released while waiting for the pause. Pin it with type_lock_prevent_release() like the other type-lock callers of types_stop_world().
nascheme
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type-bug
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This fix in this PR is the same code change as suggested by @scasella, without the additional code comment. |
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Is it possible to add a test that exposes the original issue being fixed? (I can see this might not be consistently reproducible though, not sure what the precedence is for that for) |
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Yeah, that would be a good idea. I would guess it's possible. |
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This probably needs a re-write, given GH-159972. |
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Fix
PyType_Freezereleasing the type lock while waiting for a stop-the-world pause in the free-threaded build. Another thread could modify the type before the frozen type's caches were invalidated, and the release could deadlock against a thread waiting for the pause with the type lock held.