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The server-side ping echo wrote the response but never closed the smux stream. Without an explicit close, smux buffers the 2-byte response and the client's read times out waiting for data that never arrives. Also add defensive nil check in Stream.Close().
Yamux: increase AcceptBacklog to 512, reduce StreamOpenTimeout to 20s and StreamCloseTimeout to 30s, suppress stderr logging via io.Discard. Smux: upgrade to protocol v2 (adds flow control), reduce MaxReceiveBuffer to 1MB per session (from 4MB).
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