From owner-freebsd-bugs  Tue Jul 10 10:14:41 2001
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To: neteng@tide.iadfw.net
Cc: freebsd-bugs@FreeBSD.ORG
Subject: re: kern/26224:  VFS Panic/SMP/CFLOW(HEAVY network)/Heavy NFS
From: Tor.Egge@fast.no
In-Reply-To: Your message of "Tue, 10 Jul 2001 06:20:01 -0700 (PDT)"
References: <200107101320.f6ADK1152861@freefall.freebsd.org>
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The panic message and the stack backtrace indicates that a process has
gone to sleep while holding a vnode interlock.  When pagedaemon tries
to obtain the vnode interlock (in vput() called from vm_pageout()) the
machine will either hang (if the vnode interlock was held by the other
CPU) or panic (if the vnode interlock was held by the same CPU).

Use
	ps axlww -N kernel.debug.76 -M vmcore.76

to list the processes on the system when it died.

Use gdb to list the kernel stack of each process.  The offending
process probably has an uncommon WCHAN string.

- Tor Egge

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