panic: sx_xlock() of destroyed sx @ /zoo/kris/src8/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/co mmon/fs/zfs/zfs_rlock.c:535

[Jaakko Heinonen]

On 2009-09-11, Pawel Jakub Dawidek wrote:
> > >panic: sx_xlock() of destroyed sx @ 
> > >/zoo/kris/src8/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_rlock.c:535 
> 
> I was trying to reproduce it by doing much more frequent syncs and
> lowering vnodes limit, so they are inactivated more often, but I wasn't
> able to reproduce it.
> 
> The problem here is that we lock a range for the given znode, but before
> we unlock the range, znode is destroyed.

I wonder if this could be related to PR kern/132068 (i.e. zfs_zget() can
return reclaimed vnodes).

If you can reproduce the panic you could try this patch:

http://www.saunalahti.fi/~jh3/patches/zfs_zget-vnode-reclaim-race.diff

-- 
Jaakko