panic while zfs scrubbing

[Roger Hammerstein]

> Thank you for this data.
> Please see if the following patch may help you.
> 
> --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
> +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_scan.c
> @@ -801,7 +801,7 @@ dsl_scan_visitbp(blkptr_t *bp, const zbookmark_t *zb,
>  	if (dsl_scan_check_resume(scn, dnp, zb))
>  		return;
> 
> -	if (bp->blk_birth == 0)
> +	if (bp->blk_birth == 0 || BP_GET_TYPE(bp) == DMU_OT_NONE)
>  		return;
> 
>  	scn->scn_visited_this_txg++;


it worked to get through an entire scrub.


zpool status -v zzzz

 pool: zzzz
 state: ONLINE
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
   see: http://illumos.org/msg/ZFS-8000-8A
  scan: scrub repaired 135K in 3h46m with 4 errors on Thu Aug 23 17:14:50 2012
config:

        NAME        STATE     READ WRITE CKSUM
        zzzz      ONLINE       0     0     4
          raidz2-0  ONLINE       0     0     8
            ada3    ONLINE       0     0     0
            ada7    ONLINE       0     0     4
            ada6    ONLINE       0     0     0
            ada9    ONLINE       0     0     0
            ada4    ONLINE       0     0     0
            ada2    ONLINE       0     0     2
            ada5    ONLINE       0     0     0

errors: Permanent errors have been detected in the following files:
<snip>


I started a second scrub.