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SubjectRe: send_head NULL in FIN_WAIT1 (Pre2.0.14)
>>>>> "Eric" == Eric Schenk <schenk@cs.toronto.edu> writes:

Hi Eric,

Eric> Looking over the code I expect this is over zealous checking
Eric> of potential bug conditions on my part. You can get the
Eric> above message if TCP is doing a zero window probe when it
Eric> gets the FIN from the far end. I've revised the bug check to
Eric> actually look for the error condition I'm worried about
Eric> rather than the short cut check I was using.

That would be mostly unusual.
I believe that what is happening is that the ack is being processed
before tcp_fin in tcp_ack and removes the fin segment out of the
queue. Pretty normal situation.

regards,
Pedro.


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