Panic on ZFS startup after crash

[Pawel Jakub Dawidek]

On Mon, Jul 21, 2008 at 11:02:36AM +0200, Pawel Jakub Dawidek wrote:
> On Mon, Jul 21, 2008 at 12:29:54AM +0200, Daniel Eriksson wrote:
> > Pawel Jakub Dawidek wrote:
> > 
> > > Can you try this patch?
> > > 
> > > 	http://people.freebsd.org/~pjd/patches/space_map.c.patch
> > 
> > Now it panics (solaris assert) at line 431 in dmu.c. I'll try to get a
> > backtrace in a day or two if it would help.
> 
> The backtrace won't help here. I'm afraid your pool's metadata is
> somehow corrupted that ZFS can't handle that. I saw warnings in your
> first e-mail about ZFS not beeing able to replay ZIL. Can you try
> disabling ZIL? Something like:
> 
> 	# zpool export <name>
> 	# kldunload zfs
> 	# kenv vfs.zfs.zil_disable=1
> 	# kldload zfs
> 	# zpool import <name>
> 
> Although I'm not sure if disabling ZIL will prevent replaying previously
> prepared ZIL. If that won't help, I'm afraid the last suggestion I can
> provide is to try the lastest ZFS version (I can prepare a patch for you
> in a few days).
> 
> The panic you're seeing is in dmu_write() function. You could also try
> to import a pool read-only, but I just tried doing so with
> 'zpool import -o ro <name>' command and it mount file systems
> read-write. Not sure why it doesn't work, but I'll try to fix it today.

I fixed 'zpool import -o ro' problem in HEAD, but you can also patch
your 7.0 sources with this patch:

	http://people.freebsd.org/~pjd/patches/opensolaris_vfs.c.2.patch

With this patch applied and ZIL disabled, try to:

	# zpool import -o ro <name>

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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