kern/121322: 'panic: spin lock held too long' on reboot

[Kris Kennaway]

The following reply was made to PR kern/121322; it has been noted by GNATS.

From: Kris Kennaway <kris at FreeBSD.org>
To: Lars Stokholm <lars.stokholm at gmail.com>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: kern/121322: 'panic: spin lock held too long' on reboot
Date: Tue, 04 Mar 2008 22:07:33 +0100

 Lars Stokholm wrote:
 > On Mon, Mar 3, 2008 at 9:56 PM, Kris Kennaway <kris at freebsd.org> wrote:
 >>  Can you enable WITNESS and DDB and reproduce the problem?  It will drop
 >>  into the debugger and you can do 'show locks' to show who holds it, then
 >>  'bt <#>' that thread.
 > 
 > I was unsure of what to do with 'bt', so here's just the output of the
 > command without arguments. If that's not what you wanted me to do,
 > I'll try again. :)
 
 Sorry, I meant 'show alllocks'.  Look for the spinlock and pass that 
 thread ID as the argument to bt.
 
 > I apologize for giving you the output as an image. Is there a way to
 > write it to the disk as plain text?
 
 If you call doadump then the DDB output will often be saved for display 
 by kgdb.
 
 Kris