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Ettore Di Giacinto
5847f6ee80
A dead yamux session does not always arrive wrapped. Session.close publishes shutdownErr and closes shutdownCh before it force-closes the streams, so a Write or Close landing in that window gets the raw cause back instead (session.go:507-510, 528-533), and for a peer that vanished the raw cause is a bare io.EOF. The generic io.EOF clause then reported the dead session as a clean completion. Remove the clause. A clean read-side EOF never reached it anyway: io.Copy consumes that and reports nil, and neither *yamux.Stream nor *net.TCPConn takes a WriteTo/ReadFrom path that would hand one back. Every existing spec still passes, the io.EOF entry in the normal-termination table included, which is what showed the branch was dead for legitimate endings and live only for the bug. Add a spec driving a real yamux session end to end. Every mux shape until now was a synthesized error, which is exactly why a race inside the real library stayed invisible. Assisted-by: Claude Opus 5 [claude-code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io>