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From: Greg Bonett <greg@bonett.org>
To: freebsd-stable <freebsd-stable@freebsd.org>
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Date: Sun, 06 Feb 2011 13:01:14 -0800
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Subject: 8.1 amd64 lockup (maybe zfs or disk related)
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Hi all,
I am experiencing hard lockup when running 8.1-RELEASE amd64.  The last
two times it has happened I was running a zpool scrub (high cpu and io
load).  /var/log/messages has some errors looking like:
kernel: ad0: FAILURE - READ_DMA4

but these didn't seem to correspond to the exact time of the lockup.  

any suggestions?

Thanks,
Greg