9.0-RC1 panic in tcp_input: negative winow.

Lawrence Stewart lstewart at freebsd.org
Sun Oct 23 01:50:25 UTC 2011

On 10/22/11 19:49, Pawel Jakub Dawidek wrote:
> The panic message says:
> 	panic: tcp_input negative window: tp 0xfffffe007763e000 rcv_nxt 3718269252 rcv_adv 3718268291
> I only have picture of the backtrace:
> 	http://people.freebsd.org/~pjd/misc/panic_negative_window.jpg

ewww that is not good. Can you give us any more information about the 
machine and what it's doing? Is it terminating TCP connections from the 
internet at large or only local LAN (i.e. is there likely to be packet 
loss happening)? Are you doing TSO or LRO? Do you have any non-default 
tuning in place?


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