System deadlock when using mksnap_ffs

[Kostik Belousov]

On Wed, Nov 12, 2008 at 05:58:26PM +0000, Tim Bishop wrote:
> I've been playing around with snapshots lately but I've got a problem on
> one of my servers running 7-STABLE amd64:
> 
> FreeBSD paladin 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #8: Mon Nov 10 20:49:51 GMT 2008 tdb at paladin:/usr/obj/usr/src/sys/PALADIN  amd64
> 
> I run the mksnap_ffs command to take the snapshot and some time later
> the system completely freezes up:
> 
> paladin# cd /u2/.snap/
> paladin# mksnap_ffs /u2 test.1
> 
> It only happens on this one filesystem, though, which might be to do
> with its size. It's not over the 2TB marker, but it's pretty close. It's
> also backed by a hardware RAID system, although a smaller filesystem on
> the same RAID has no issues.
> 
> Filesystem  1K-blocks       Used     Avail Capacity  Mounted on
> /dev/da0s1a 2078881084 921821396 990749202    48%    /u2
> 
> To clarify "completely freezes up": unresponsive to all services over
> the network, except ping. On the console I can switch between the ttys,
> but none of them respond. The only way out is to hit the reset button.
> 
> Any advice? I'm happy to help debug this further to get to the bottom of
> it.

You need to provide information described in the
http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html
and especially
http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
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