Fix locking of stable class values for JI proxies #8845
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Because the proxy calculation tends to recurse for classes, there may be multiple StableValue preparing proxies at the same time. Depending on the ordering of the classes encountered, this can lead to deadlocks. This fixes the deadlock by matching MapBasedClassValue's one lock per ClassValue instance, and also properly double-checks the value which was missing in the previous version.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Because the proxy calculation tends to recurse for classes, there may be multiple StableValue preparing proxies at the same time. Depending on the ordering of the classes encountered, this can lead to deadlocks.
This fixes the deadlock by matching MapBasedClassValue's one lock per ClassValue instance, and also properly double-checks the value which was missing in the previous version.