kern/59455: lock order reversal

[dirk.meyer at dinoex.sub.org]

>Number:         59455
>Category:       kern
>Synopsis:       lock order reversal
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Nov 19 00:20:19 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     Dirk Meyer
>Release:        FreeBSD 5.1-CURRENT i386
>Organization:
privat
>Environment:

FreeBSD current.dinoex.sub.de 5.1-CURRENT FreeBSD 5.1-CURRENT #4: Tue Nov 11 22:06:00 CET 2003     root at current.dinoex.sub.de:/usr/obj/usr/src/sys/NET5  i386

>Description:

Nov 19 05:51:18 current kernel: Sleeping on "stopevent" with the following non-sleepable locks held:
Nov 19 05:51:18 current kernel: exclusive sleep mutex sigacts r = 0 (0xc4e34aa8) locked @ /usr/src/sys/kern/kern_synch.c:293
Nov 19 05:51:18 current kernel: lock order reversal
Nov 19 05:51:18 current kernel: 1st 0xc4e34aa8 sigacts (sigacts) @ /usr/src/sys/kern/kern_synch.c:293
Nov 19 05:51:18 current kernel: 2nd 0xc49337fc process lock (process lock) @ /usr/src/sys/kern/kern_synch.c:309
Nov 19 05:51:18 current kernel: Stack backtrace:
Nov 19 05:51:18 current kernel: Sleeping on "stopevent" with the following non-sleepable locks held:
Nov 19 05:51:18 current kernel: exclusive sleep mutex sigacts r = 0 (0xc4e34aa8) locked @ /usr/src/sys/kern/subr_trap.c:260
Nov 19 05:51:18 current kernel: Sleeping on "stopevent" with the following non-sleepable locks held:
Nov 19 05:51:18 current kernel: exclusive sleep mutex sigacts r = 0 (0xc4e34aa8) locked @ /usr/src/sys/kern/subr_trap.c:260

>How-To-Repeat:

	a client was mounting nfs from thsi machine.
	I can't reproduce it.

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: