events: fix weak listener retention overwrite - #64024
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Friendly ping, could a collaborator approve CI when there's a moment , happy to address any review feedback. |
jasnell
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CI workflows are still awaiting approval, could someone approve the workflow run when there's a moment? |
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CI ran but two jobs failed (node-test-commit, node-test-pull-request) I don't have Jenkins read access to check the logs, could a collaborator check ? |
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avivkeller
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@aryansaves Can you please rebase? Flaky tests are failing in |
The weakListeners() retention map in EventTarget stored a single listener per retainer key. Multiple addEventListener() calls sharing the same retainer (e.g. two listeners on one target using the same AbortSignal) silently evicted each other's strong reference, allowing the evicted listener to be garbage collected before its signal aborted, so only the most recently registered listener was ever actually removed on abort. Changed the retention map to store a Set of listeners per retainer key instead of a single listener, and added matching cleanup in remove() so entries are released once their retainer's set is empty. This also fixes the same class of bug in events.aborted() and the streams kWeakHandler usage, since both go through the same EventTarget.prototype.addEventListener() code path. Fixes: nodejs#63954 Signed-off-by: aryan7905 <aryansrivastava354@gmail.com>
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@trivikr rebase done, CI needs approval |
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #64024 +/- ##
==========================================
- Coverage 90.14% 90.13% -0.01%
==========================================
Files 751 751
Lines 253679 253700 +21
Branches 47789 47800 +11
==========================================
+ Hits 228671 228684 +13
- Misses 16264 16272 +8
Partials 8744 8744
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The weakListeners() retention map in EventTarget stored a single listener per retainer key. Multiple addEventListener() calls sharing the same retainer (e.g. two listeners on one target using the same AbortSignal) silently evicted each other's strong reference, allowing the evicted listener to be garbage collected before its signal aborted, so only the most recently registered listener was ever actually removed on abort.
Changed the retention map to store a Set of listeners per retainer key instead of a single listener, and added matching cleanup in remove() so entries are released once their retainer's set is empty.
This also fixes the same class of bug in events.aborted() and the streams kWeakHandler usage, since both go through the same EventTarget.prototype.addEventListener() code path.
Fixes: #63954