port-amd64/45251: Kernel panic on nfs server

[ober%netbsd.org@localhost]

>Number:         45251
>Category:       port-amd64
>Synopsis:       Kernel panic on nfs server
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 14 11:25:00 +0000 2011
>Originator:     Jaime Fournier
>Release:        HEAD/5.99.55 from Jul 22 2011
>Organization:
NetBSD
>Environment:
NetBSD 5.99.55 (GENERIC) #0: Fri Jul 22 14:18:03 UTC 2011
        
builds%b7.netbsd.org@localhost:/home/builds/ab/HEAD/amd64/201107221240Z-obj/home/builds/ab/HEAD/src/sys/arch/amd64/compile/GENERIC
>Description:
/home/builds/ab/HEAD/src/sys/netinet/tcp_output.c:708: tcpcb 0xffff800003c46010
reass already locked
panic: tcp_reass_lock
cpu0: begin traceback...
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff8025d9ff cs 8 rflags 10246 cr2 e00001ff cpl 4 rsp
 ffff8000471a3ff0
Skipping crash dump on recursive panic
panic: trap
Fauled in mid-traceback; aborting;

>How-To-Repeat:
Only one crash after several hours of heavy nfs traffic.

>Fix:
Updated to latest head to see if problem persists.