RESOLVED FIXED298499
AbortController with event listeners causes memory leak due to incorrect GC reachability check 
https://bugs.webkit.org/show_bug.cgi?id=298499
Summary AbortController with event listeners causes memory leak due to incorrect GC r...
tbvjaos510
Reported 2025-09-06 09:29:48 PDT
AbortController objects with event listeners are never garbage collected, causing memory leaks. Steps to Reproduce: 1. Create AbortController instances 2. Add event listeners to their signals 3. Remove all references to the controllers 4. Force garbage collection Expected Result: AbortController objects should be garbage collected when no longer referenced. Actual Result: AbortController objects with event listeners remain in memory indefinitely. Root Cause: The JSAbortSignalOwner::isReachableFromOpaqueRoots() method incorrectly marks all AbortSignals with event listeners as always reachable, preventing garbage collection even when they have no other references.
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tbvjaos510
Comment 1 2025-09-06 22:30:01 PDT
Pull request: https://github.com/WebKit/WebKit/pull/50419
tbvjaos510
Comment 2 2025-09-07 01:50:19 PDT
Pull request: https://github.com/Webkit/Webkit/pull/50419
EWS
Comment 3 2025-09-09 10:18:29 PDT
Committed 299758@main (1f6b6bea2079): <https://commits.webkit.org/299758@main> Reviewed commits have been landed. Closing PR #50419 and removing active labels.
Radar WebKit Bug Importer
Comment 4 2025-09-09 10:19:12 PDT
<rdar://problem/160211727>
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