vfs deadlock during panic?

[Jeremy Chadwick]

On Wed, Feb 24, 2010 at 10:36:14PM -0800, Jake Holland wrote:
> I'm running today's stable/8 -r 204294 on a Dell r610 (2 processors with
> 4 cores per processor).  I have turned on WITNESS and DEBUG_VFS_LOCKS,
> because I've been trying to troubleshoot an occasional hang during
> panic, and I think I have reason to believe a vfs deadlock is occurring.
> Some details below.
> {snip}

All the backtraces indicate UFS snapshots are being used, as in you're
doing dump -L or mksnap_ffs.  Is that the case?

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |