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This patch fixes a race condition that occurs when connecting to a NT 3.51 host without specifying a NetBIOS name. In that case a RFC1002_NEGATIVE_SESSION_RESPONSE is received and the SMB negotiation is reattempted, but under some conditions it leads SendReceive() to hang forever while waiting for srv_mutex. This, in turn, sets the calling process to an uninterruptible sleep state and makes it unkillable. The solution is to unlock the srv_mutex acquired in the demux thread *before* going to sleep (after the reconnect error) and before reattempting the connection.