Fix race condition panic in loadbalancer.nextServer #10318
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Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
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briandowns
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Jun 7, 2024
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #10318 +/- ##
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- Coverage 47.72% 41.55% -6.18%
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Files 177 177
Lines 14802 14806 +4
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- Hits 7064 6152 -912
- Misses 6396 7479 +1083
+ Partials 1342 1175 -167
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. |
vitorsavian
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Jun 7, 2024
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Proposed Changes
Fix race condition panic in loadbalancer.nextServer
Multiple goroutines may increment the nextServerIndex field at the same time, after its value has been clamped to the size of the list by another goroutine. This leads to an attempt to reference an item past the end of the list.
Types of Changes
bugfix
Verification
See linked issue.
This may be hard to replicate on k3s, as it requires a large number of goroutines dialing connections using a loadbalancer with multiple failed servers in the list.
Testing
Linked Issues
User-Facing Change
Further Comments