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Date: Tue, 11 Mar 2008 01:35:33 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Eric F Crist <ecrist@secure-computing.net>
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Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS kernel panic in single user
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Eric F Crist wrote:
> Hey folks,
> 
> Please 'reply-all' as I'm not on the mailing list.
> 
> For background, we've got the following setup:
>     
>     Dell PowerEdge 1650 w/2xP3 1.113GHz 1GB ECC RAM
>     Dell SCSI ACI Backplane 1x3
>     2x 73GB Seagate 10K SCSI Drives
>     1x IDE->CF Converter
>     1x 1GB CF Card
> 
> We loosely followed the instructions over at 
> http://www.ish.com.au/solutions/articles/freebsdzfs.  There is one key 
> difference to our setup from the ish.com.au instructions.  We are using 
> the CF card for our /bootdir partition to get the FreeBSD kernel loaded 
> enough to load the ZFS modules.  We don't have a boot record or anything 
> on the two SCSI drives.  Our idea being that, if a drive fails, the CF 
> card and all the boot goodness stays where it is.
> 
> To my point.  I ran across the ZFSKnownProblems wiki page which strongly 
> encourages the reporting of any problems we have.  From a booted system, 
> I issued the 'shutdown now' command to bring the system down to 
> single-user mode.  Issuing a reboot command from this point, I get the 
> following errors:
> 
>     Spin lock 0xc0bdca00 (sched lock) held by 0xc3f10c60 (tid 100001) 
> too long
>     panic: spin lock held too long

Please add WITNESS and DDB and determine the backtrace of the thread 
holding the lock, then file this information in a PR.

Kris