Han-Wen Nienhuys
2e74c77368
Use channels and a dedicated write loop for managing the rekeying process. This lets us collect packets to be written while a key exchange is in progress. Previously, the read loop ran the key exchange, and writers would block if a key exchange was going on. If a reader wrote back a packet while processing a read packet, it could block, stopping the read loop, thus causing a deadlock. Such coupled read/writes are inherent with handling requests that want a response (eg. keepalive, opening/closing channels etc.). The buffered channels (most channels have capacity 16) papered over these problems, but under load SSH connections would occasionally deadlock. Fixes #18439. Change-Id: I7c14ff4991fa3100a5d36025125d0cf1119c471d Reviewed-on: https://go-review.googlesource.com/35012 Run-TryBot: Han-Wen Nienhuys <hanwen@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
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