waneal opened a new pull request, #40197:
URL: https://github.com/apache/beam/pull/40197

   Fixes #32656
   
   ## Summary
   
   `Server.artifacts` (`map[string][]byte`) was read and written without
   synchronization from `ReverseArtifactRetrievalService` (write) and
   `GetArtifact` (read), causing `fatal error: concurrent map writes`
   under the race detector.
   
   [#32657](https://github.com/apache/beam/pull/32657) proposed the same
   fix in 2024 but was never merged, and no longer applies cleanly to the
   current `Server` struct (which has since gained `logger`/`mw` fields).
   [#35024](https://github.com/apache/beam/pull/35024) separately fixed a
   race on `s.jobs`, but left `s.artifacts` unguarded.
   
   This PR adds a dedicated `artifactsMu sync.RWMutex` around
   `s.artifacts`, adapted to the current code.
   
   ------------------------
   
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