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From: "Lawrence Farr" <freebsd-stable@epcdirect.co.uk>
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Date: Wed, 27 May 2009 17:25:11 +0100
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Subject: ZFS panic in zfs_fuid_create
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I updated my backup boxes to the latest and greatest ZFS code,
and started getting the following panic on them all (3 machines):

panic: zfs_fuid_create
cpuid = 1
Uptime: 1h28m48s
Cannot dump. No dump device defined.
Automatic reboot in 15 seconds - press a key on the console to abort

A quick google found kern/133020 with a patch from PJD that has fixed
it for me. Should it be in stable or does it break something else?