[PR #10923/19643c9c backport][3.12] Fix weakref garbage collection race condition in DNS resolver manager #10924
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bdraco
approved these changes
May 21, 2025
Codecov ReportAll modified and coverable lines are covered by tests ✅
✅ All tests successful. No failed tests found. Additional details and impacted files@@ Coverage Diff @@
## 3.12 #10924 +/- ##
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Coverage 98.14% 98.15%
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Files 130 130
Lines 39279 39302 +23
Branches 2220 2222 +2
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+ Hits 38552 38575 +23
Misses 554 554
Partials 173 173
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. |
CodSpeed Performance ReportMerging #10924 will not alter performanceComparing Summary
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bdraco
deleted the
patchback/backports/3.12/19643c9cfe734ced3d2a821aa53c7f30c737a097/pr-10923
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This is a backport of PR #10923 as merged into master (19643c9).
Fix
AttributeError: NoneType object has no attribute cancelin DNS resolver cleanupDownstream users reported a crash during test teardown with the following error:
The issue occurs in
_DNSResolverManager.release_resolver()when the weakref-managed resolver object gets garbage collected before it can be properly cancelled. This creates a race condition where the resolver reference becomesNonebut the cleanup code still tries to callresolver.cancel().