ZFS hang in production on 8.2-RELEASE

[Luke Marsden]

On Mon, 2011-08-29 at 23:02 +0100, Luke Marsden wrote:
> On Mon, 2011-08-29 at 22:54 +0200, Martin Matuska wrote:
> > No, I think this is more likely fixed by pjd's bugfix in r224791 (MFC'ed
> > to stable/8 as r225100).
> > 
> > The corresponding patch is:
> > http://people.freebsd.org/~pjd/patches/zfsdev_state_lock.patch
> > 
> 
> Great, thanks!  Will this patch apply to ZFS v15?  We can't upgrade to
> v28 yet.
> 

We just got another hang in production, same procstat -kk on zfs umount
-f as before:

52739 100186 zfs              -                mi_switch+0x176
sleepq_wait+0x42 _sleep+0x317 zfsvfs_teardown+0x269 zfs_umount+0x1c4
dounmount+0x32a unmount+0x38b syscallenter+0x1e5 syscall+0x4b
Xfast_syscall+0xe2 

Please advise whether the zfsdev_state_lock patch with apply to
8.2-RELEASE and whether it is wise to attempt to apply it?

Thank you!

-- 
Best Regards,
Luke Marsden
CTO, Hybrid Logic Ltd.

Web: http://www.hybrid-cluster.com/
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