From owner-freebsd-current@FreeBSD.ORG  Tue Sep 28 19:58:43 2010
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Date: Wed, 29 Sep 2010 04:56:01 +0900
From: Takanori Watanabe <takawata@init-main.com>
Subject: UFS related panic at night.
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I happend to encountered panic related to UFS.
It is occured by find(1) from daily script by 
NULL pointing sx(9) lock from UFS dirhash.


Mounted filesystem is like this.

%mount 
/dev/ada0s2a on / (ufs, local, soft-updates)
devfs on /dev (devfs, local, multilabel)
/dev/ada0s2e on /usr (ufs, NFS exported, local, soft-updates)
/dev/ada0s2d on /var (ufs, local, soft-updates)
procfs on /proc (procfs, local)

And stack backtrace is at
http://www.init-main.com/DVC00052.JPG
(screen shot.)