fix: race condition accessing packConnection.stderrBuf
#1635
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Go's built-in data race detector keeps reporting a race between the read of
packConnection.stderrBufbycheckError()and the write to it byioutil.CopyBufferPool.I must confess that I don't fully understand the rationale here. Can't the goroutine that includes
ioutil.CopyBufferPool(&c.stderrBuf, stderr)run afterHashshake()returns? There's no synchronization between the parent and child goroutines; hence, we may miss the stderr.