From owner-freebsd-fs@FreeBSD.ORG  Wed Jul 29 11:42:21 2009
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Date: Wed, 29 Jul 2009 14:42:16 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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Cc: freebsd-fs@FreeBSD.org, FreeBSD current <freebsd-current@FreeBSD.org>,
	Pawel Jakub Dawidek <pjd@FreeBSD.org>
Subject: Re: zfs: Fatal trap 12: page fault while in kernel mode
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on 29/07/2009 14:21 Andriy Gapon said the following:
> Your panics are superficially similar but seem to be different.
> But it is hard to tell as function argument values are not available in your
> backtraces for the interesting calls.
> One difference that I see is that your panics happen one level below _sx_xlock, in
> sx_xlock_hard and sx argument value appears to be far from NULL
> (0xffffff0043557d50) - in the panic that started this thread it was near NULL.
> Another difference is that you panics do not involve zfs_znode_dmu_fini and
> mu_buf_update_user, in your case sx_xlock is called directly from
> zfs_freebsd_reclaim. So it must a problem with a different lock.

BTW, have you tried to reproduce the problem with INVARIANTS enabled?
Do you have crashdumps with debugging symbols?


-- 
Andriy Gapon