Update registry.rs #14695
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Update registry.rs #14695
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If before Entry::drop() calls Registry::maybe_remove, the weak ref under the same key1 and key2 is replaced, Entry::drop can be called recursively resulting in a deadlock. The crux is we try to see if the entry has been replaced by trying to upgrading it to a strong ref, and it possible that the upgrade is successful and the result becomes a only ref to the new entry. This tries to fix it by determining the same thing by seeing if Weak::strong_count() is 0 instead of upgrading the weak ref.
Reverting the condition to check whether the bench tests failures persists.
⏱️ 16m total CI duration on this PR
🚨 1 job on the last run was significantly faster/slower than expected
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Reverting the condition to check whether the bench tests failures persists.
Description
If before Entry::drop() calls Registry::maybe_remove, the weak ref under the same key1 and key2 is replaced, Entry::drop can be called recursively resulting in a deadlock. The crux is we try to see if the entry has been replaced by trying to upgrading it to a strong ref, and it possible that the upgrade is successful and the result becomes a only ref to the new entry.
This tries to fix it by determining the same thing by seeing if Weak::strong_count() is 0 instead of upgrading the weak ref.
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