[v18] Fix data race in Kubernetes StreamSession#61818
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rosstimothy merged 1 commit intobranch/v18from Nov 28, 2025
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The websocket used to communicate with Kubernetes was proctected by a mutex to prevent data races from concurrent writes. The mutex was however not being acquired when closing the session which could lead to data races since handling of various aspects of an interactive session are done in multiple goroutines. All existing direct calls to `WriteMessage` were replaced with the new `(SessionStream) write` function which serializes all writes as intended by acquiring the `writeSync` mutex. `(SessionStream) Close` was also reorganized to reduce indentation and return any errors that may be returned from closing the websocket. `SessionStream.closed` has been updated to atomic.Bool instead of an int32 that was accessed via the atomic.Int32 APIs.
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Backport #61807 to branch/v18
changelog: Prevent data races when terminating interactive Kubernetes sessions