FS hang when creating snapshots on a UFS SU+J setup

I have a RELENG_9 machine that hangs when a snapshot is created on the
root fs (UFS, with SU+J). =A0More accurately, all the processes show a
state of "suspfs" (with ^T) and no fs activity is completed from then
on. =A0A hard reboot (power cycle) was the only way to proceed.

Here's some reference info - let me know what else I should provide.

$uname -a
FreeBSD xxx.xxx.net 9.0-PRERELEASE FreeBSD 9.0-PRERELEASE #0: Sun Dec
25 05:04:37 UTC 2011 =A0 =A0 root@xxx.xxx.net:/usr/obj/usr/src/sys/GENERIC
amd64

csup was run just before build[world|kernel] so you have reference on
the version information.

$mount
/dev/gpt/root on / (ufs, local, journaled soft-updates)
devfs on /dev (devfs, local, multilabel)
linprocfs on /compat/linux/proc (linprocfs, local)
{ zfs info removed }

$df -h
Filesystem =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Size =A0 =A0Used =A0 Avail Ca=
pacity =A0Mounted on
/dev/gpt/root =A0 =A0 =A0 =A0 =A0 =A0 =A0 454G =A0 =A09.1G =A0 =A0409G =A0 =
=A0 2% =A0 =A0/
devfs =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 1.0k =A0 =A01.0k =A0 =A0 =
=A00B =A0 100% =A0 =A0/dev
linprocfs =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 4.0k =A0 =A04.0k =A0 =A0 =A00=
B =A0 100% =A0 =A0/compat/linux/proc
{ zfs info removed }

After the hard reset, there was a snapshot file listed in /.snap and
it was ~465 GB, iirc. =A0Unfortunately, I needed to get things going
again so I was not able to debug or diagnose further. =A0I may be able
to schedule a time that I could recreate the issue and diagnose
better, but I wanted to get your input on what data points and/or
command you would be interested in.

Thanks in advance,

Bryce
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