Cherry-pick #8519 to v1.75.x#8530
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…ler_server (grpc#8519) Fixes: grpc#8514 The mutex that guards the trailers should be held while copying the trailers. We do lock the mutex in [the regular gRPC server transport](https://github.com/grpc/grpc-go/blob/9ac0ec87ca2ecc66b3c0c084708aef768637aef6/internal/transport/http2_server.go#L1140-L1142), but have missed it in the std lib http/2 transport. The only place where a write happens is `writeStatus()` is when the status contains a proto. https://github.com/grpc/grpc-go/blob/4375c784450aa7e43ff15b8b2879c896d0917130/internal/transport/handler_server.go#L251-L252 RELEASE NOTES: * transport: Fix a data race while copying headers for stats handlers in the std lib http2 server transport.
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## v1.75.x #8530 +/- ##
===========================================
- Coverage 81.77% 81.74% -0.04%
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Files 413 413
Lines 40530 40570 +40
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+ Hits 33145 33163 +18
- Misses 6003 6005 +2
- Partials 1382 1402 +20
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dfawley
approved these changes
Aug 21, 2025
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Original PR: #8519
Related issue: #8514
RELEASE NOTES: