kern/38215: panic: tcp_output REXMT on 3.1.0_PATCH

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

>Number:         38215
>Category:       kern
>Synopsis:       panic: tcp_output REXMT on 3.1.0_PATCH
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 10 21:30:00 +0000 2008
>Originator:     Manuel Bouyer
>Release:        3.1.0_PATCH
>Organization:

LIP6

>Environment:
NetBSD 3.1.0_PATCH (FTP) #3: Sat Dec  2 22:16:27 CET 2006
Architecture: i386
Machine: i386
>Description:

        This is a fairly busy ftp/http server. It paniced with:
panic: tcp_output REXMT
Stopped at      netbsd:cpu_Debugger+0x5:        leave
db>  tr                            
cpu_Debugger() at netbsd:cpu_Debugger+0x5
panic() at netbsd:panic+0x1c8
tcp_segsize() at netbsd:tcp_segsize
tcp_timer_persist() at netbsd:tcp_timer_persist+0x73
softclock() at netbsd:softclock+0x2c9
softintr_dispatch() at netbsd:softintr_dispatch+0x99
DDB lost frame for netbsd:Xsoftclock+0x2d, trying 0xffffffff8069bcd0
Xsoftclock() at netbsd:Xsoftclock+0x2d
--- interrupt ---
>How-To-Repeat:
        lots of TCP connections on a public server ?
>Fix: