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fix: Synchronize access to reads of fields in retry test#63967
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The reads for
s.streamFailureFuncands.streamErrorfields must be mutex protectedsince another method may perform writes to those fields at the same time, and both
reads and writes must use the same mutex.
Test plan
I ran
bazel test //internal/grpc/retry:retry_test --runs_per_test=100and no longer seea data race failure, but I see other errors, see Slack thread.