zfs diff deadlock

[Andriy Gapon]

on 17/11/2012 00:35 Peter Jeremy said the following:
> On 2012-Nov-14 07:27:30 +1100, Peter Jeremy <peter at server.rulingia.com> 
> wrote:
>> On head, I get some normal differences terminated by: Unable to
>> determine path or stats for object 2128453 in tank/beckett/home at 20120518:
>> Invalid argument
> 
> I've done some more digging and got the following.  Does it make sense for 
> an object that is a "ZFS plain file" to have another "ZFS plain file" as a 
> parent?  It doesn't sound right to me.

There was a bug that could result in a problem like this (because of corrupted
znode attributes) after certain operations.
What version of FreeBSD do you run there (branch+rev) ?

> root at FB10-64:~ # zdb -vvv tank/beckett/home at 20120518 2128453 Dataset 
> tank/beckett/home at 20120518 [ZPL], ID 605, cr_txg 8379, 143G, 2026419 
> objects, rootbp DVA[0]=<0:266a0efa00:200> DVA[1]=<0:31b07fbc00:200> [L0
> DMU objset] fletcher4 lzjb LE contiguous unique double size=800L/200P 
> birth=8375L/8375P fill=2026419 
> cksum=1acdb1fbd9:93bf9c61e94:1b35c72eb8adb:389743898e4f79
> 
> Object  lvl   iblk   dblk  dsize  lsize   %full  type 2128453    1    16K 
> 1.50K  1.50K  1.50K  100.00  ZFS plain file 264   bonus  ZFS znode dnode 
> flags: USED_BYTES USERUSED_ACCOUNTED dnode maxblkid: 0 path 
> ???<object#2128453> uid     1000 gid     1000 atime   Fri Mar 23 16:34:52 
> 2012 mtime   Sat Oct 22 16:13:42 2011 ctime   Sun Oct 23 21:09:02 2011 
> crtime  Sat Oct 22 16:13:42 2011 gen     2237174 mode    100444 size 1089
> parent  2242171 links   1 pflags  40800000004 xattr   0 rdev 
> 0x0000000000000000
> 
> root at FB10-64:~ # zdb -vvv tank/beckett/home at 20120518 2242171 Dataset 
> tank/beckett/home at 20120518 [ZPL], ID 605, cr_txg 8379, 143G, 2026419 
> objects, rootbp DVA[0]=<0:266a0efa00:200> DVA[1]=<0:31b07fbc00:200> [L0
> DMU objset] fletcher4 lzjb LE contiguous unique double size=800L/200P 
> birth=8375L/8375P fill=2026419 
> cksum=1acdb1fbd9:93bf9c61e94:1b35c72eb8adb:389743898e4f79
> 
> Object  lvl   iblk   dblk  dsize  lsize   %full  type 2242171    3    16K 
> 128K  25.4M  25.5M  100.00  ZFS plain file 264   bonus  ZFS znode dnode 
> flags: USED_BYTES USERUSED_ACCOUNTED dnode maxblkid: 203 path 
> /jashank/Pictures/sch/pdm-a4-11/stereo-pair-2.png uid     1000 gid 1000
> atime   Fri Mar 23 16:41:53 2012 mtime   Mon Oct 24 21:15:56 2011 ctime
> Mon Oct 24 21:15:56 2011 crtime  Mon Oct 24 21:15:37 2011 gen 2286679 mode
> 100644 size    26625731 parent  7001490 links   1 pflags 40800000004 xattr
> 0 rdev    0x0000000000000000
> 
> root at FB10-64:~ # zdb -vvv tank/beckett/home at 20120518 7001490 Dataset 
> tank/beckett/home at 20120518 [ZPL], ID 605, cr_txg 8379, 143G, 2026419 
> objects, rootbp DVA[0]=<0:266a0efa00:200> DVA[1]=<0:31b07fbc00:200> [L0
> DMU objset] fletcher4 lzjb LE contiguous unique double size=800L/200P 
> birth=8375L/8375P fill=2026419 
> cksum=1acdb1fbd9:93bf9c61e94:1b35c72eb8adb:389743898e4f79
> 
> Object  lvl   iblk   dblk  dsize  lsize   %full  type 7001490    1    16K 
> 512     1K    512  100.00  ZFS directory 264   bonus  ZFS znode dnode 
> flags: USED_BYTES USERUSED_ACCOUNTED dnode maxblkid: 0 path 
> /jashank/Pictures/sch/pdm-a4-11 uid     1000 gid     1000 atime   Thu May 
> 17 03:38:32 2012 mtime   Mon Oct 24 21:15:37 2011 ctime   Mon Oct 24 
> 21:15:37 2011 crtime  Fri Oct 14 22:17:44 2011 gen     2088407 mode 40755
> size    6 parent  6370559 links   2 pflags  40800000144 xattr   0 rdev
> 0x0000000000000000 microzap: 512 bytes, 4 entries
> 
> stereo-pair-2.png = 2242171 (type: Regular File) stereo-pair-2.xcf = 
> 7002074 (type: Regular File) stereo-pair-1.xcf = 7001512 (type: Regular 
> File) stereo-pair-1.png = 2241802 (type: Regular File)
> 
> root at FB10-64:~ #
> 


-- 
Andriy Gapon