Re: need help how to debug xfs crash issue xfs_iunlink_remove: xfs_inotobp() returned error 22

[符永涛 <yongtaofu@xxxxxxxxx>]

Dear Brian and xfs experts,

Brain your scripts works and I am able to reproduce it with glusterfs rebalance on our test cluster. 2 of our server xfs shutdown during glusterfs rebalance, the shutdown userspace stacktrace both related to pthread. See logs bellow, What's your opinion? Thank you very much!

logs:
[root@xxxxxxxxxxx ~]# cat xfs.log

--- xfs_imap -- module("xfs").function("xfs_imap@fs/xfs/xfs_ialloc.c:1257").return -- return=0x16
vars: mp=0xffff882017a50800 tp=0xffff881c81797c70 ino=0xffffffff imap=0xffff88100e2f7c08 flags=0x0 agbno=? agino=? agno=? blks_per_cluster=? chunk_agbno=? cluster_agbno=? error=? offset=? offset_agbno=? __func__=[...]
mp: m_agno_log = 0x5, m_agino_log = 0x20
mp->m_sb: sb_agcount = 0x1c, sb_agblocks = 0xffffff0, sb_inopblog = 0x4, sb_agblklog = 0x1c, sb_dblocks = 0x1b4900000
imap: im_blkno = 0x0, im_len = 0xa078, im_boffset = 0x86ea
kernel backtrace:
Returning from:  0xffffffffa02b3ab0 : xfs_imap+0x0/0x280 [xfs]
Returning to  :  0xffffffffa02b9599 : xfs_inotobp+0x49/0xc0 [xfs]
 0xffffffffa02b96f1 : xfs_iunlink_remove+0xe1/0x320 [xfs]
 0xffffffff81501a69
 0x0 (inexact)
user backtrace:
 0x3bd1a0e5ad [/lib64/libpthread-2.12.so+0xe5ad/0x219000]

--- xfs_iunlink_remove -- module("xfs").function("xfs_iunlink_remove@fs/xfs/xfs_inode.c:1680").return -- return=0x16
vars: tp=0xffff881c81797c70 ip=0xffff881003c13c00 next_ino=? mp=? agi=? dip=? agibp=0xffff880109b47e20 ibp=? agno=? agino=? next_agino=? last_ibp=? last_dip=0xffff882000000000 bucket_index=? offset=? last_offset=0xffffffffffff8810 error=? __func__=[...]
ip: i_ino = 0x113, i_flags = 0x0
ip->i_d: di_nlink = 0x0, di_gen = 0x0
[root@xxxxxxxxxxx ~]#
[root@xxxxxxxxxxx ~]# cat xfs.log

--- xfs_imap -- module("xfs").function("xfs_imap@fs/xfs/xfs_ialloc.c:1257").return -- return=0x16
vars: mp=0xffff881017c6c800 tp=0xffff8801037acea0 ino=0xffffffff imap=0xffff882017101c08 flags=0x0 agbno=? agino=? agno=? blks_per_cluster=? chunk_agbno=? cluster_agbno=? error=? offset=? offset_agbno=? __func__=[...]
mp: m_agno_log = 0x5, m_agino_log = 0x20
mp->m_sb: sb_agcount = 0x1c, sb_agblocks = 0xffffff0, sb_inopblog = 0x4, sb_agblklog = 0x1c, sb_dblocks = 0x1b4900000
imap: im_blkno = 0x0, im_len = 0xd98, im_boffset = 0x547
kernel backtrace:
Returning from:  0xffffffffa02b3ab0 : xfs_imap+0x0/0x280 [xfs]
Returning to  :  0xffffffffa02b9599 : xfs_inotobp+0x49/0xc0 [xfs]
 0xffffffffa02b96f1 : xfs_iunlink_remove+0xe1/0x320 [xfs]
 0xffffffff81501a69
 0x0 (inexact)
user backtrace:
 0x30cd40e5ad [/lib64/libpthread-2.12.so+0xe5ad/0x219000]

--- xfs_iunlink_remove -- module("xfs").function("xfs_iunlink_remove@fs/xfs/xfs_inode.c:1680").return -- return=0x16
vars: tp=0xffff8801037acea0 ip=0xffff880e697c8800 next_ino=? mp=? agi=? dip=? agibp=0xffff880d846c2d60 ibp=? agno=? agino=? next_agino=? last_ibp=? last_dip=0xffff881017c6c800 bucket_index=? offset=? last_offset=0xffffffffffff880e error=? __func__=[...]
ip: i_ino = 0x142, i_flags = 0x0
ip->i_d: di_nlink = 0x0, di_gen = 0x3565732e

2013/4/15 符永涛 <yongtaofu@xxxxxxxxx>

Also glusterfs use a lot of hardlink for self-heal:
--------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/998416323
---------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/999296624
---------T 2 root root 0 Apr 15 12:24 /mnt/xfsd/testbug/999568484
---------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/999956875
---------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/.glusterfs/05/2f/052f4e3e-c379-4a3c-b995-a10fdaca33d0
---------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/.glusterfs/05/95/0595272e-ce2b-45d5-8693-d02c00b94d9d
---------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/.glusterfs/05/ca/05ca00a0-92a7-44cf-b6e3-380496aafaa4
---------T 2 root root 0 Apr 15 12:24 /mnt/xfsd/testbug/.glusterfs/0a/23/0a238ca7-3cef-4540-9c98-6bf631551b21
---------T 2 root root 0 Apr 15 11:58 /mnt/xfsd/testbug/.glusterfs/0a/4b/0a4b640b-f675-4708-bb59-e2369ffbbb9d

Does it related?

2013/4/15 符永涛 <yongtaofu@xxxxxxxxx>

Dear xfs experts,

Now I'm deploying Brian's system script in out cluster. But from last night till now 5 servers in our 24 servers xfs shutdown with the same error. I run xfs_repair command and found all the lost inodes are glusterfs dht link files. This explains why the xfs shutdown tend to happen during glusterfs rebalance. During glusterfs rebalance procedure a lot of dhk link files may be unlinked. For example the following inodes are found in lost+found in one of the servers:
[root@* lost+found]# pwd
/mnt/xfsd/lost+found
[root@* lost+found]# ls -l
total 740
---------T 1 root root 0 Apr  8 21:06 100119
---------T 1 root root 0 Apr  8 21:11 101123
---------T 1 root root 0 Apr  8 21:19 102659
---------T 1 root root 0 Apr 12 14:46 1040919
---------T 1 root root 0 Apr 12 14:58 1041943
---------T 1 root root 0 Apr  8 21:32 105219
---------T 1 root root 0 Apr  8 21:37 105731
---------T 1 root root 0 Apr 12 17:48 1068055
---------T 1 root root 0 Apr 12 18:38 1073943
---------T 1 root root 0 Apr  8 21:54 108035
---------T 1 root root 0 Apr 12 21:49 1091095
---------T 1 root root 0 Apr 13 00:17 1111063
---------T 1 root root 0 Apr 13 03:51 1121815
---------T 1 root root 0 Apr  8 22:25 112387
---------T 1 root root 0 Apr 13 06:39 1136151
...
[root@* lost+found]# getfattr -m . -d -e hex *

# file: 96007
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0xa0370d8a9f104dafbebbd0e6dd7ce1f7
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3600
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x0000000049dff000

# file: 97027
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0xc1c1fe2ec7034442a623385f43b04c25
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3600
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x000000006ac78000

# file: 97559
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0xcf7c17013c914511bda4d1c743fae118
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3500
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x00000000519fb000

# file: 98055
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0xe86abc6e2c4b44c28d415fbbe34f2102
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3600
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x000000004c098000

# file: 98567
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0x12543a2efbdf4b9fa61c6d89ca396f80
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3500
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x000000006bc98000

# file: 98583
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0x760d16d3b7974cfb9c0a665a0982c470
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3500
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x000000006cde9000

# file: 99607
trusted.afr.mams-cq-mt-video-client-3=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-4=0x000000000000000000000000
trusted.afr.mams-cq-mt-video-client-5=0x000000000000000000000000
trusted.gfid=0x0849a732ea204bc3b8bae830b46881da
trusted.glusterfs.dht.linkto=0x6d616d732d63712d6d742d766964656f2d7265706c69636174652d3500
trusted.glusterfs.quota.ca34e1ce-f046-4ed4-bbd1-261b21bfe0b8.contri=0x00000000513f1000
...

What do you think about it? Thank you very much.

2013/4/12 符永涛 <yongtaofu@xxxxxxxxx>

Hi Brian,

Your scripts works for me now after I installed all the rpm built out from kernel srpm. I'll try it. Thank you.

2013/4/12 Brian Foster <bfoster@xxxxxxxxxx>

On 04/12/2013 04:32 AM, 符永涛 wrote:
> Dear xfs experts,
> Can I just call xfs_stack_trace(); in the second line of
> xfs_do_force_shutdown() to print stack and rebuild kernel to check
> what's the error?
>

I suppose that's a start. If you're willing/able to create and run a
modified kernel for the purpose of collecting more debug info, perhaps
we can get a bit more creative in collecting more data on the problem
(but a stack trace there is a good start).

BTW- you might want to place the call after the XFS_FORCED_SHUTDOWN(mp)
check almost halfway into the function to avoid duplicate messages.

Brian

>
> 2013/4/12 符永涛 <yongtaofu@xxxxxxxxx <mailto:yongtaofu@xxxxxxxxx>>

>
>     Hi Brian,
>     What else I'm missing? Thank you.
>     stap -e 'probe module("xfs").function("xfs_iunlink"){}'
>
>     WARNING: cannot find module xfs debuginfo: No DWARF information found
>     semantic error: no match while resolving probe point
>     module("xfs").function("xfs_iunlink")
>     Pass 2: analysis failed.  Try again with another '--vp 01' option.
>
>

>     2013/4/12 符永涛 <yongtaofu@xxxxxxxxx <mailto:yongtaofu@xxxxxxxxx>>

>
>         ls -l
>         /usr/lib/debug/lib/modules/2.6.32-279.el6.x86_64/kernel/fs/xfs/xfs.ko.debug
>         -r--r--r-- 1 root root 21393024 Apr 12 12:08
>         /usr/lib/debug/lib/modules/2.6.32-279.el6.x86_64/kernel/fs/xfs/xfs.ko.debug
>
>         rpm -qa|grep  kernel
>         kernel-headers-2.6.32-279.el6.x86_64
>         kernel-devel-2.6.32-279.el6.x86_64
>         kernel-2.6.32-358.el6.x86_64
>         kernel-debuginfo-common-x86_64-2.6.32-279.el6.x86_64
>         abrt-addon-kerneloops-2.0.8-6.el6.x86_64
>         kernel-firmware-2.6.32-358.el6.noarch
>         kernel-debug-2.6.32-358.el6.x86_64
>         kernel-debuginfo-2.6.32-279.el6.x86_64
>         dracut-kernel-004-283.el6.noarch
>         libreport-plugin-kerneloops-2.0.9-5.el6.x86_64
>         kernel-devel-2.6.32-358.el6.x86_64
>         kernel-2.6.32-279.el6.x86_64
>
>         rpm -q kernel-debuginfo
>         kernel-debuginfo-2.6.32-279.el6.x86_64
>
>         rpm -q kernel
>         kernel-2.6.32-279.el6.x86_64
>         kernel-2.6.32-358.el6.x86_64
>
>         do I need to re probe it?
>
>
>         2013/4/12 Eric Sandeen <sandeen@xxxxxxxxxxx

>         <mailto:sandeen@xxxxxxxxxxx>>

>
>             On 4/11/13 11:32 PM, 符永涛 wrote:
>             > Hi Brian,
>             > Sorry but when I execute the script it says:
>             > WARNING: cannot find module xfs debuginfo: No DWARF
>             information found
>             > semantic error: no match while resolving probe point
>             module("xfs").function("xfs_iunlink")
>             >
>             > uname -a
>             > 2.6.32-279.el6.x86_64
>             > kernel debuginfo has been installed.
>             >
>             > Where can I find the correct xfs debuginfo?
>
>             it should be in the kernel-debuginfo rpm (of the same
>             version/release as the kernel rpm you're running)
>
>             You should have:
>
>             /usr/lib/debug/lib/modules/2.6.32-279.el6.x86_64/kernel/fs/xfs/xfs.ko.debug
>
>             If not, can you show:
>
>             # uname -a
>             # rpm -q kernel
>             # rpm -q kernel-debuginfo
>
>             -Eric
>
>
>
>
>
>         --
>         符永涛
>
>
>
>
>     --
>     符永涛
>
>
>
>
> --
> 符永涛
>
>

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