gh-117657: Fix race involving GC and heap initialization - #119923
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colesbury merged 1 commit intoJun 4, 2024
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The `_PyThreadState_Bind()` function is called before the first `PyEval_AcquireThread()` so it's not synchronized with the stop the world GC. We had a race where `gc_visit_heaps()` might visit a thread's heap while it's being initialized. Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before `tstate_mimalloc_bind()` is called). The race was reproducible by running: `python Lib/test/test_importlib/partial/pool_in_threads.py`.
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I guess we could have also used the presence of current_object_heap and made that an atomic sign but I suppose the extra flag is a little clearer. |
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DinoV
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Jun 3, 2024
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LGTM!
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Thanks @colesbury for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. |
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miss-islington
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…nGH-119923) The `_PyThreadState_Bind()` function is called before the first `PyEval_AcquireThread()` so it's not synchronized with the stop the world GC. We had a race where `gc_visit_heaps()` might visit a thread's heap while it's being initialized. Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before `tstate_mimalloc_bind()` is called). The race was reproducible by running: `python Lib/test/test_importlib/partial/pool_in_threads.py`. (cherry picked from commit e69d068) Co-authored-by: Sam Gross <colesbury@gmail.com>
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GH-120038 is a backport of this pull request to the 3.13 branch. |
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colesbury
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…19923) (#120038) The `_PyThreadState_Bind()` function is called before the first `PyEval_AcquireThread()` so it's not synchronized with the stop the world GC. We had a race where `gc_visit_heaps()` might visit a thread's heap while it's being initialized. Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before `tstate_mimalloc_bind()` is called). The race was reproducible by running: `python Lib/test/test_importlib/partial/pool_in_threads.py`. (cherry picked from commit e69d068) Co-authored-by: Sam Gross <colesbury@gmail.com>
barneygale
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…n#119923) The `_PyThreadState_Bind()` function is called before the first `PyEval_AcquireThread()` so it's not synchronized with the stop the world GC. We had a race where `gc_visit_heaps()` might visit a thread's heap while it's being initialized. Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before `tstate_mimalloc_bind()` is called). The race was reproducible by running: `python Lib/test/test_importlib/partial/pool_in_threads.py`.
noahbkim
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…n#119923) The `_PyThreadState_Bind()` function is called before the first `PyEval_AcquireThread()` so it's not synchronized with the stop the world GC. We had a race where `gc_visit_heaps()` might visit a thread's heap while it's being initialized. Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before `tstate_mimalloc_bind()` is called). The race was reproducible by running: `python Lib/test/test_importlib/partial/pool_in_threads.py`.
estyxx
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…n#119923) The `_PyThreadState_Bind()` function is called before the first `PyEval_AcquireThread()` so it's not synchronized with the stop the world GC. We had a race where `gc_visit_heaps()` might visit a thread's heap while it's being initialized. Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before `tstate_mimalloc_bind()` is called). The race was reproducible by running: `python Lib/test/test_importlib/partial/pool_in_threads.py`.
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The _PyThreadState_Bind() function is called before PyEval_AcquireThread() so it's not synchronized with the stop the world GC. We had a race where gc_visit_heaps() might visit a thread's heap while it's being initialized.
Use a simple atomic int to avoid visiting heaps for threads that are not yet fully initialized (i.e., before tstate_mimalloc_bind() is called).
The race was reproducible by running:
python Lib/test/test_importlib/partial/pool_in_threads.py.