ZFS: zpool scrub lockup

Thomas Ronner thomas at ronner.org
Thu Jul 9 15:35:13 UTC 2009

Hi Andriy,

Andriy Gapon wrote:
> on 08/07/2009 23:30 Thomas Ronner said the following:
>> Hello,
>> I don't know whether this is the right list; maybe freebsd-fs is more
>> appropriate. So please redirect me there if this isn't the right place.
>> My system (i386, Athlon XP) locks hard when scrubbing a certain pool. It
>> has been doing this for at least a couple of months now. For this reason
>> I upgraded to 7.2-STABLE recently as this had the latest ZFS bits, but
>> this doesn't help. It even makes the problem worse: in previous versions
>> I just hit the reset button and forgot about it, but now it "remembers"
>> that it was scrubbing (I presume) and tries to resume at the exact same
>> place, locking up again. This means I haven't been able to mount these
>> ZFS volumes successfully: the moment I do a /etc/rc.d/zfs start from
>> single user mode (I have my /, /var and /usr on UFS) it locks up in a
>> couple of seconds. And by locks up I really mean locks up. No panic,
>> nothing. Pressing the reset button on the chassis is the only way to
>> reboot. 
> You can try adding SW_WATCHDOG option to your kernel which might help catching the
> lockup. Things like INVARIANTS and WITNESS might help th debugging too.
> Serial console for remote debugging would be very useful too.

I'll definitely try those and report back on this list. Thanks for your 

Regards, Thomas

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