gh-121794: Don't set ob_tid to zero in fast-path dealloc
#121799
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We should maintain the invariant that a zero `ob_tid` implies the refcount fields are merged. * Move the assignment in `_Py_MergeZeroLocalRefcount` to immediately before the refcount merge. * Update `_PyTrash_thread_destroy_chain` to set `ob_ref_shared` to `_Py_REF_MERGED` when setting `ob_tid` to zero. Also check this invariant with assertions in the GC in debug builds. That uncovered a bug when running out of memory during GC.
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needs backport to 3.13
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🤖 New build scheduled with the buildbot fleet by @colesbury for commit 0e3bac1 🤖 If you want to schedule another build, you need to add the 🔨 test-with-refleak-buildbots label again. |
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Thanks @colesbury for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13. |
miss-islington
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Jul 15, 2024
…honGH-121799) We should maintain the invariant that a zero `ob_tid` implies the refcount fields are merged. * Move the assignment in `_Py_MergeZeroLocalRefcount` to immediately before the refcount merge. * Update `_PyTrash_thread_destroy_chain` to set `ob_ref_shared` to `_Py_REF_MERGED` when setting `ob_tid` to zero. Also check this invariant with assertions in the GC in debug builds. That uncovered a bug when running out of memory during GC. (cherry picked from commit d23be39) Co-authored-by: Sam Gross <colesbury@gmail.com>
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GH-121821 is a backport of this pull request to the 3.13 branch. |
colesbury
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…-121799) (#121821) We should maintain the invariant that a zero `ob_tid` implies the refcount fields are merged. * Move the assignment in `_Py_MergeZeroLocalRefcount` to immediately before the refcount merge. * Update `_PyTrash_thread_destroy_chain` to set `ob_ref_shared` to `_Py_REF_MERGED` when setting `ob_tid` to zero. Also check this invariant with assertions in the GC in debug builds. That uncovered a bug when running out of memory during GC. (cherry picked from commit d23be39) Co-authored-by: Sam Gross <colesbury@gmail.com>
estyxx
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Jul 17, 2024
…hon#121799) We should maintain the invariant that a zero `ob_tid` implies the refcount fields are merged. * Move the assignment in `_Py_MergeZeroLocalRefcount` to immediately before the refcount merge. * Update `_PyTrash_thread_destroy_chain` to set `ob_ref_shared` to `_Py_REF_MERGED` when setting `ob_tid` to zero. Also check this invariant with assertions in the GC in debug builds. That uncovered a bug when running out of memory during GC.
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We should maintain the invariant that a zero
ob_tidimplies the refcount fields are merged._Py_MergeZeroLocalRefcountto immediately before the refcount merge._PyTrash_thread_destroy_chainto setob_ref_sharedto_Py_REF_MERGEDwhen settingob_tidto zero.Also check this invariant with assertions in the GC in debug builds. That uncovered a bug when running out of memory during GC.
_Py_MergeZeroLocalRefcountshould not setob_tidto zero in fast-path dealloc #121794