kern/47851: kernel panic: callout_softclock(v=0x0) -> nfs_timer(arg=0x0)

[cheusov%tut.by@localhost]

>Number:         47851
>Category:       kern
>Synopsis:       kernel panic: callout_softclock(v=0x0) -> nfs_timer(arg=0x0)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 24 13:40:00 +0000 2013
>Originator:     Aleksey Cheusov
>Release:        NetBSD 6.0.1_PATCH
>Organization:
>Environment:
System: NetBSD cheusov.imb.invention.com 6.0.1_PATCH NetBSD 6.0.1_PATCH 
(GENERIC) #4: Wed Mar 13 17:27:04 FET 2013 
cheusov%cheusov.imb.invention.com@localhost:/srv/obj/sys/arch/i386/compile/GENERIC
 i386
Architecture: i386
Machine: i386
>Description:
Stacktrace is below. This crash happened immediately after

   /etc/rc.d/mountd onestart; /etc/rc.d/nfsd onestart

and attempt to nfsmount one exported directory from Linux.

#3  0xc0788def in panic (fmt=0xc0ba72f2 "trap") at 
/srv/src_netbsd6/sys/kern/subr_prf.c:205
#4  0xc07cee5b in trap (frame=0xdc319be8) at 
/srv/src_netbsd6/sys/arch/i386/i386/trap.c:396
#5  0xc010cfb8 in ?? ()
#6  0xc0613538 in nfs_timer (arg=0x0) at 
/srv/src_netbsd6/sys/nfs/nfs_socket.c:846
#7  0xc055ecf8 in callout_softclock (v=0x0) at 
/srv/src_netbsd6/sys/kern/kern_timeout.c:734
#8  0xc05544af in softint_execute (s=<optimized out>, si=<optimized out>, 
l=<optimized out>) at /srv/src_netbsd6/sys/kern/kern_softint.c:543
#9  softint_dispatch (pinned=0xc9b6d540, s=2) at 
/srv/src_netbsd6/sys/kern/kern_softint.c:825

>Fix:

Unknown