#20371
89%

Ran 29 Jul 2026 06:36AM UTC

Jobs 1

Files 686

Run time 1min

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Committed 29 Jul 2026 06:23AM UTC coverage: 89.171% (-0.004%) from 89.175%

Build # #20371

Build Type

push

github

Committed by

web-flow

Commit Message

xds: Fix concurrent StreamObserver usage in ExternalProcessorClientInterceptorTest (#12915)

Synchronize calls to the gRPC StreamObserver (responseObserver) inside
mock ExternalProcessor implementations. The mock servers in several
tests spawn background threads to handle requests, but they invoke
responseObserver.onNext(), onCompleted(), and onError() concurrently
without synchronization. Since standard StreamObservers are not
thread-safe, this leads to ThreadSanitizer-reported data races in gRPC
internals (such as ServerCallImpl).

This change wraps all asynchronous/background invocations of
responseObserver methods inside synchronized blocks on the observer
instance to ensure serialized execution.

Flagged by TSAN in b/533413322

Coverage Stats

38272 of 42920 relevant lines covered (89.17%)

0.89 hits per line

Coverage Regressions

Lines	Coverage	∆	File
3	95.07	-0.44%	../core/src/main/java/io/grpc/internal/RetriableStream.java
3	74.14	-2.59%	../servlet/src/main/java/io/grpc/servlet/ServletServerStream.java
2	90.63	-0.69%	../core/src/main/java/io/grpc/internal/DelayedClientCall.java
1	87.6	-0.83%	../rls/src/main/java/io/grpc/rls/LinkedHashLruCache.java

Jobs

ID	Job ID	Ran	Files	Coverage
1	#20371.1	29 Jul 2026 06:36AM UTC	686	89.17

grpc / grpc-java / #20371
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