[Ocfs2-users] ocfs2 - Kernel panic on many write/read from both servers

Eduardo Diaz - Gmail ediazrod at gmail.com
Wed Dec 7 02:42:53 PST 2011 

You can make a fsck.ocfs2 to see if the filesystem are broken?

On Wed, Dec 7, 2011 at 11:30 AM, Marek Krolikowski <admin at wset.edu.pl> wrote:
> Hello
> I use: sys-fs/ocfs2-tools-1.6.4 and create file system with all features:
> mkfs.ocfs2 -N 2 -L MAIL --fs-feature-level=max-features /dev/dm-0
> and after this got kernel panic :(
>
>
>
> -----Oryginalna wiadomość----- From: Eduardo Diaz - Gmail
> Sent: Wednesday, December 07, 2011 11:08 AM
> To: Marek Krolikowski
>
> Cc: ocfs2-users at oss.oracle.com
> Subject: Re: [Ocfs2-users] ocfs2 - Kernel panic on many write/read from both
> servers
>
> Try to use other filesystem for example xfs and make a full test.
>
> Try create a one node cluster and filesystem and make tests..
> (fileindex can be the problem)
>
> make a fsck to the filesystem
>
> Try upgrade ocfs2 to last version and use the max features, only has
> two nodes?..
>
> I will do. make a backup, create a new filesystem with all features
> that you need and make mkfs. the cluster only with the number of the
> nodes that you will use.
>
> Restore de data.
>
> Make extensive test for a week before put in production :-)..
>
> On Tue, Dec 6, 2011 at 2:04 PM, Marek Krolikowski <admin at wset.edu.pl> wrote:
>>
>> hey m8
>> Like i say i am not expert too but when i use ext3 and write/read working
>> with np.
>>
>>
>> -----Oryginalna wiadomość----- From: Eduardo Diaz - Gmail
>> Sent: Tuesday, December 06, 2011 3:06 AM
>> To: Marek Królikowski
>> Cc: ocfs2-users at oss.oracle.com
>> Subject: Re: [Ocfs2-users] ocfs2 - Kernel panic on many write/read from
>> both
>> servers
>>
>>
>> I am not a expert, but you have a problem in you EMC system (multipath
>> system) or drivers.
>>
>> Did you test this before put in production? or test this NAS with
>> other filesystem, xfs for example?.
>>
>> As I read I see" that hung_task_timeout_secs" some task wait more that
>> 120 seg may be a problem of you EMC/Fiber/cable problem...
>>
>> 2011/12/4 Marek Królikowski <admin at wset.edu.pl>:
>>>
>>>
>>> I do for all night tests with write/read files from ocfs2 on both servers
>>> something like this:
>>> On MAIL1 server:
>>> #!/bin/bash
>>> while true
>>> do
>>> rm -rf /mnt/EMC/MAIL1
>>> mkdir /mnt/EMC/MAIL1
>>> cp -r /usr /mnt/EMC/MAIL1
>>> rm -rf /mnt/EMC/MAIL1
>>> done;
>>> On MAIL2 server:
>>> #!/bin/bash
>>> while true
>>> do
>>> rm -rf /mnt/EMC/MAIL2
>>> mkdir /mnt/EMC/MAIL2
>>> cp -r /usr /mnt/EMC/MAIL2
>>> rm -rf /mnt/EMC/MAIL2
>>> done;
>>>
>>> Today i check logs and see:
>>> o2dlm: Node 1 joins domain EAC7942B71964050AE2046D3F0CDD7B2
>>> o2dlm: Nodes in domain EAC7942B71964050AE2046D3F0CDD7B2: 0 1
>>> (rm,26136,0):ocfs2_unlink:953 ERROR: status = -2
>>> (touch,26137,0):ocfs2_check_dir_for_entry:2120 ERROR: status = -17
>>> (touch,26137,0):ocfs2_mknod:461 ERROR: status = -17
>>> (touch,26137,0):ocfs2_create:631 ERROR: status = -17
>>> (rm,26142,0):ocfs2_unlink:953 ERROR: status = -2
>>> INFO: task kworker/u:2:20246 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> kworker/u:2     D ffff88107f4525c0     0 20246      2 0x00000000
>>> ffff880b730b57d0 0000000000000046 ffff8810201297d0 00000000000125c0
>>> ffff880f5a399fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff880f5a398000 00000000000125c0 ffff880f5a399fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff81481b71>] ? __mutex_lock_slowpath+0xd1/0x140
>>> [<ffffffff814818d3>] ? mutex_lock+0x23/0x40
>>> [<ffffffffa0937d95>] ? ocfs2_wipe_inode+0x105/0x690 [ocfs2]
>>> [<ffffffffa0935cfb>] ? ocfs2_query_inode_wipe.clone.9+0xcb/0x370 [ocfs2]
>>> [<ffffffffa09385a4>] ? ocfs2_delete_inode+0x284/0x3f0 [ocfs2]
>>> [<ffffffffa0919a10>] ? ocfs2_dentry_attach_lock+0x5a0/0x5a0 [ocfs2]
>>> [<ffffffffa093872e>] ? ocfs2_evict_inode+0x1e/0x50 [ocfs2]
>>> [<ffffffff81145900>] ? evict+0x70/0x140
>>> [<ffffffffa0919322>] ? __ocfs2_drop_dl_inodes.clone.2+0x32/0x60 [ocfs2]
>>> [<ffffffffa0919a39>] ? ocfs2_drop_dl_inodes+0x29/0x90 [ocfs2]
>>> [<ffffffff8106e56f>] ? process_one_work+0x11f/0x440
>>> [<ffffffff8106f279>] ? worker_thread+0x159/0x330
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff81073fa6>] ? kthread+0x96/0xa0
>>> [<ffffffff8148bb24>] ? kernel_thread_helper+0x4/0x10
>>> [<ffffffff81073f10>] ? kthread_worker_fn+0x1a0/0x1a0
>>> [<ffffffff8148bb20>] ? gs_change+0x13/0x13
>>> INFO: task rm:5192 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> rm              D ffff88107f2725c0     0  5192  16338 0x00000000
>>> ffff881014ccb040 0000000000000082 ffff8810206b8040 00000000000125c0
>>> ffff8804d7697fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff8804d7696000 00000000000125c0 ffff8804d7697fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff8148148d>] ? schedule_timeout+0x1ed/0x2e0
>>> [<ffffffffa0886162>] ? dlmconvert_master+0xe2/0x190 [ocfs2_dlm]
>>> [<ffffffffa08878bf>] ? dlmlock+0x7f/0xb70 [ocfs2_dlm]
>>> [<ffffffff81480e0a>] ? wait_for_common+0x13a/0x190
>>> [<ffffffff8104bc50>] ? try_to_wake_up+0x280/0x280
>>> [<ffffffffa0928a38>] ? __ocfs2_cluster_lock.clone.21+0x1d8/0x6b0 [ocfs2]
>>> [<ffffffffa0928fcc>] ? ocfs2_inode_lock_full_nested+0xbc/0x490 [ocfs2]
>>> [<ffffffffa0943c1b>] ? ocfs2_lookup_lock_orphan_dir+0x6b/0x1b0 [ocfs2]
>>> [<ffffffffa09454ba>] ? ocfs2_prepare_orphan_dir+0x4a/0x280 [ocfs2]
>>> [<ffffffffa094616f>] ? ocfs2_unlink+0x6ef/0xb90 [ocfs2]
>>> [<ffffffff811b35a9>] ? may_link.clone.22+0xd9/0x170
>>> [<ffffffff8113aa58>] ? vfs_unlink+0x98/0x100
>>> [<ffffffff8113ac41>] ? do_unlinkat+0x181/0x1b0
>>> [<ffffffff8113e7cd>] ? vfs_readdir+0x9d/0xe0
>>> [<ffffffff811653d8>] ? fsnotify_find_inode_mark+0x28/0x40
>>> [<ffffffff81166324>] ? dnotify_flush+0x54/0x110
>>> [<ffffffff8112b07f>] ? filp_close+0x5f/0x90
>>> [<ffffffff8148aa12>] ? system_call_fastpath+0x16/0x1b
>>> INFO: task kworker/u:2:20246 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> kworker/u:2     D ffff88107f4525c0     0 20246      2 0x00000000
>>> ffff880b730b57d0 0000000000000046 ffff8810201297d0 00000000000125c0
>>> ffff880f5a399fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff880f5a398000 00000000000125c0 ffff880f5a399fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff81481b71>] ? __mutex_lock_slowpath+0xd1/0x140
>>> [<ffffffff814818d3>] ? mutex_lock+0x23/0x40
>>> [<ffffffffa0937d95>] ? ocfs2_wipe_inode+0x105/0x690 [ocfs2]
>>> [<ffffffffa0935cfb>] ? ocfs2_query_inode_wipe.clone.9+0xcb/0x370 [ocfs2]
>>> [<ffffffffa09385a4>] ? ocfs2_delete_inode+0x284/0x3f0 [ocfs2]
>>> [<ffffffffa0919a10>] ? ocfs2_dentry_attach_lock+0x5a0/0x5a0 [ocfs2]
>>> [<ffffffffa093872e>] ? ocfs2_evict_inode+0x1e/0x50 [ocfs2]
>>> [<ffffffff81145900>] ? evict+0x70/0x140
>>> [<ffffffffa0919322>] ? __ocfs2_drop_dl_inodes.clone.2+0x32/0x60 [ocfs2]
>>> [<ffffffffa0919a39>] ? ocfs2_drop_dl_inodes+0x29/0x90 [ocfs2]
>>> [<ffffffff8106e56f>] ? process_one_work+0x11f/0x440
>>> [<ffffffff8106f279>] ? worker_thread+0x159/0x330
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff81073fa6>] ? kthread+0x96/0xa0
>>> [<ffffffff8148bb24>] ? kernel_thread_helper+0x4/0x10
>>> [<ffffffff81073f10>] ? kthread_worker_fn+0x1a0/0x1a0
>>> [<ffffffff8148bb20>] ? gs_change+0x13/0x13
>>> INFO: task rm:5192 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> rm              D ffff88107f2725c0     0  5192  16338 0x00000000
>>> ffff881014ccb040 0000000000000082 ffff8810206b8040 00000000000125c0
>>> ffff8804d7697fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff8804d7696000 00000000000125c0 ffff8804d7697fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff8148148d>] ? schedule_timeout+0x1ed/0x2e0
>>> [<ffffffffa0886162>] ? dlmconvert_master+0xe2/0x190 [ocfs2_dlm]
>>> [<ffffffffa08878bf>] ? dlmlock+0x7f/0xb70 [ocfs2_dlm]
>>> [<ffffffff81480e0a>] ? wait_for_common+0x13a/0x190
>>> [<ffffffff8104bc50>] ? try_to_wake_up+0x280/0x280
>>> [<ffffffffa0928a38>] ? __ocfs2_cluster_lock.clone.21+0x1d8/0x6b0 [ocfs2]
>>> [<ffffffffa0928fcc>] ? ocfs2_inode_lock_full_nested+0xbc/0x490 [ocfs2]
>>> [<ffffffffa0943c1b>] ? ocfs2_lookup_lock_orphan_dir+0x6b/0x1b0 [ocfs2]
>>> [<ffffffffa09454ba>] ? ocfs2_prepare_orphan_dir+0x4a/0x280 [ocfs2]
>>> [<ffffffffa094616f>] ? ocfs2_unlink+0x6ef/0xb90 [ocfs2]
>>> [<ffffffff811b35a9>] ? may_link.clone.22+0xd9/0x170
>>> [<ffffffff8113aa58>] ? vfs_unlink+0x98/0x100
>>> [<ffffffff8113ac41>] ? do_unlinkat+0x181/0x1b0
>>> [<ffffffff8113e7cd>] ? vfs_readdir+0x9d/0xe0
>>> [<ffffffff811653d8>] ? fsnotify_find_inode_mark+0x28/0x40
>>> [<ffffffff81166324>] ? dnotify_flush+0x54/0x110
>>> [<ffffffff8112b07f>] ? filp_close+0x5f/0x90
>>> [<ffffffff8148aa12>] ? system_call_fastpath+0x16/0x1b
>>> INFO: task kworker/u:2:20246 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> kworker/u:2     D ffff88107f4525c0     0 20246      2 0x00000000
>>> ffff880b730b57d0 0000000000000046 ffff8810201297d0 00000000000125c0
>>> ffff880f5a399fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff880f5a398000 00000000000125c0 ffff880f5a399fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff81481b71>] ? __mutex_lock_slowpath+0xd1/0x140
>>> [<ffffffff814818d3>] ? mutex_lock+0x23/0x40
>>> [<ffffffffa0937d95>] ? ocfs2_wipe_inode+0x105/0x690 [ocfs2]
>>> [<ffffffffa0935cfb>] ? ocfs2_query_inode_wipe.clone.9+0xcb/0x370 [ocfs2]
>>> [<ffffffffa09385a4>] ? ocfs2_delete_inode+0x284/0x3f0 [ocfs2]
>>> [<ffffffffa0919a10>] ? ocfs2_dentry_attach_lock+0x5a0/0x5a0 [ocfs2]
>>> [<ffffffffa093872e>] ? ocfs2_evict_inode+0x1e/0x50 [ocfs2]
>>> [<ffffffff81145900>] ? evict+0x70/0x140
>>> [<ffffffffa0919322>] ? __ocfs2_drop_dl_inodes.clone.2+0x32/0x60 [ocfs2]
>>> [<ffffffffa0919a39>] ? ocfs2_drop_dl_inodes+0x29/0x90 [ocfs2]
>>> [<ffffffff8106e56f>] ? process_one_work+0x11f/0x440
>>> [<ffffffff8106f279>] ? worker_thread+0x159/0x330
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff81073fa6>] ? kthread+0x96/0xa0
>>> [<ffffffff8148bb24>] ? kernel_thread_helper+0x4/0x10
>>> [<ffffffff81073f10>] ? kthread_worker_fn+0x1a0/0x1a0
>>> [<ffffffff8148bb20>] ? gs_change+0x13/0x13
>>> INFO: task rm:5192 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> rm              D ffff88107f2725c0     0  5192  16338 0x00000000
>>> ffff881014ccb040 0000000000000082 ffff8810206b8040 00000000000125c0
>>> ffff8804d7697fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff8804d7696000 00000000000125c0 ffff8804d7697fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff8148148d>] ? schedule_timeout+0x1ed/0x2e0
>>> [<ffffffffa0886162>] ? dlmconvert_master+0xe2/0x190 [ocfs2_dlm]
>>> [<ffffffffa08878bf>] ? dlmlock+0x7f/0xb70 [ocfs2_dlm]
>>> [<ffffffff81480e0a>] ? wait_for_common+0x13a/0x190
>>> [<ffffffff8104bc50>] ? try_to_wake_up+0x280/0x280
>>> [<ffffffffa0928a38>] ? __ocfs2_cluster_lock.clone.21+0x1d8/0x6b0 [ocfs2]
>>> [<ffffffffa0928fcc>] ? ocfs2_inode_lock_full_nested+0xbc/0x490 [ocfs2]
>>> [<ffffffffa0943c1b>] ? ocfs2_lookup_lock_orphan_dir+0x6b/0x1b0 [ocfs2]
>>> [<ffffffffa09454ba>] ? ocfs2_prepare_orphan_dir+0x4a/0x280 [ocfs2]
>>> [<ffffffffa094616f>] ? ocfs2_unlink+0x6ef/0xb90 [ocfs2]
>>> [<ffffffff811b35a9>] ? may_link.clone.22+0xd9/0x170
>>> [<ffffffff8113aa58>] ? vfs_unlink+0x98/0x100
>>> [<ffffffff8113ac41>] ? do_unlinkat+0x181/0x1b0
>>> [<ffffffff8113e7cd>] ? vfs_readdir+0x9d/0xe0
>>> [<ffffffff811653d8>] ? fsnotify_find_inode_mark+0x28/0x40
>>> [<ffffffff81166324>] ? dnotify_flush+0x54/0x110
>>> [<ffffffff8112b07f>] ? filp_close+0x5f/0x90
>>> [<ffffffff8148aa12>] ? system_call_fastpath+0x16/0x1b
>>> INFO: task kworker/u:2:20246 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> kworker/u:2     D ffff88107f4525c0     0 20246      2 0x00000000
>>> ffff880b730b57d0 0000000000000046 ffff8810201297d0 00000000000125c0
>>> ffff880f5a399fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff880f5a398000 00000000000125c0 ffff880f5a399fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff81481b71>] ? __mutex_lock_slowpath+0xd1/0x140
>>> [<ffffffff814818d3>] ? mutex_lock+0x23/0x40
>>> [<ffffffffa0937d95>] ? ocfs2_wipe_inode+0x105/0x690 [ocfs2]
>>> [<ffffffffa0935cfb>] ? ocfs2_query_inode_wipe.clone.9+0xcb/0x370 [ocfs2]
>>> [<ffffffffa09385a4>] ? ocfs2_delete_inode+0x284/0x3f0 [ocfs2]
>>> [<ffffffffa0919a10>] ? ocfs2_dentry_attach_lock+0x5a0/0x5a0 [ocfs2]
>>> [<ffffffffa093872e>] ? ocfs2_evict_inode+0x1e/0x50 [ocfs2]
>>> [<ffffffff81145900>] ? evict+0x70/0x140
>>> [<ffffffffa0919322>] ? __ocfs2_drop_dl_inodes.clone.2+0x32/0x60 [ocfs2]
>>> [<ffffffffa0919a39>] ? ocfs2_drop_dl_inodes+0x29/0x90 [ocfs2]
>>> [<ffffffff8106e56f>] ? process_one_work+0x11f/0x440
>>> [<ffffffff8106f279>] ? worker_thread+0x159/0x330
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff81073fa6>] ? kthread+0x96/0xa0
>>> [<ffffffff8148bb24>] ? kernel_thread_helper+0x4/0x10
>>> [<ffffffff81073f10>] ? kthread_worker_fn+0x1a0/0x1a0
>>> [<ffffffff8148bb20>] ? gs_change+0x13/0x13
>>> INFO: task rm:5192 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> rm              D ffff88107f2725c0     0  5192  16338 0x00000000
>>> ffff881014ccb040 0000000000000082 ffff8810206b8040 00000000000125c0
>>> ffff8804d7697fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff8804d7696000 00000000000125c0 ffff8804d7697fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff8148148d>] ? schedule_timeout+0x1ed/0x2e0
>>> [<ffffffffa0886162>] ? dlmconvert_master+0xe2/0x190 [ocfs2_dlm]
>>> [<ffffffffa08878bf>] ? dlmlock+0x7f/0xb70 [ocfs2_dlm]
>>> [<ffffffff81480e0a>] ? wait_for_common+0x13a/0x190
>>> [<ffffffff8104bc50>] ? try_to_wake_up+0x280/0x280
>>> [<ffffffffa0928a38>] ? __ocfs2_cluster_lock.clone.21+0x1d8/0x6b0 [ocfs2]
>>> [<ffffffffa0928fcc>] ? ocfs2_inode_lock_full_nested+0xbc/0x490 [ocfs2]
>>> [<ffffffffa0943c1b>] ? ocfs2_lookup_lock_orphan_dir+0x6b/0x1b0 [ocfs2]
>>> [<ffffffffa09454ba>] ? ocfs2_prepare_orphan_dir+0x4a/0x280 [ocfs2]
>>> [<ffffffffa094616f>] ? ocfs2_unlink+0x6ef/0xb90 [ocfs2]
>>> [<ffffffff811b35a9>] ? may_link.clone.22+0xd9/0x170
>>> [<ffffffff8113aa58>] ? vfs_unlink+0x98/0x100
>>> [<ffffffff8113ac41>] ? do_unlinkat+0x181/0x1b0
>>> [<ffffffff8113e7cd>] ? vfs_readdir+0x9d/0xe0
>>> [<ffffffff811653d8>] ? fsnotify_find_inode_mark+0x28/0x40
>>> [<ffffffff81166324>] ? dnotify_flush+0x54/0x110
>>> [<ffffffff8112b07f>] ? filp_close+0x5f/0x90
>>> [<ffffffff8148aa12>] ? system_call_fastpath+0x16/0x1b
>>> INFO: task kworker/u:2:20246 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> kworker/u:2     D ffff88107f4525c0     0 20246      2 0x00000000
>>> ffff880b730b57d0 0000000000000046 ffff8810201297d0 00000000000125c0
>>> ffff880f5a399fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff880f5a398000 00000000000125c0 ffff880f5a399fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff81481b71>] ? __mutex_lock_slowpath+0xd1/0x140
>>> [<ffffffff814818d3>] ? mutex_lock+0x23/0x40
>>> [<ffffffffa0937d95>] ? ocfs2_wipe_inode+0x105/0x690 [ocfs2]
>>> [<ffffffffa0935cfb>] ? ocfs2_query_inode_wipe.clone.9+0xcb/0x370 [ocfs2]
>>> [<ffffffffa09385a4>] ? ocfs2_delete_inode+0x284/0x3f0 [ocfs2]
>>> [<ffffffffa0919a10>] ? ocfs2_dentry_attach_lock+0x5a0/0x5a0 [ocfs2]
>>> [<ffffffffa093872e>] ? ocfs2_evict_inode+0x1e/0x50 [ocfs2]
>>> [<ffffffff81145900>] ? evict+0x70/0x140
>>> [<ffffffffa0919322>] ? __ocfs2_drop_dl_inodes.clone.2+0x32/0x60 [ocfs2]
>>> [<ffffffffa0919a39>] ? ocfs2_drop_dl_inodes+0x29/0x90 [ocfs2]
>>> [<ffffffff8106e56f>] ? process_one_work+0x11f/0x440
>>> [<ffffffff8106f279>] ? worker_thread+0x159/0x330
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff8106f120>] ? manage_workers.clone.21+0x120/0x120
>>> [<ffffffff81073fa6>] ? kthread+0x96/0xa0
>>> [<ffffffff8148bb24>] ? kernel_thread_helper+0x4/0x10
>>> [<ffffffff81073f10>] ? kthread_worker_fn+0x1a0/0x1a0
>>> [<ffffffff8148bb20>] ? gs_change+0x13/0x13
>>> INFO: task rm:5192 blocked for more than 120 seconds.
>>> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>>> rm              D ffff88107f2725c0     0  5192  16338 0x00000000
>>> ffff881014ccb040 0000000000000082 ffff8810206b8040 00000000000125c0
>>> ffff8804d7697fd8 00000000000125c0 00000000000125c0 00000000000125c0
>>> ffff8804d7696000 00000000000125c0 ffff8804d7697fd8 00000000000125c0
>>> Call Trace:
>>> [<ffffffff8148148d>] ? schedule_timeout+0x1ed/0x2e0
>>> [<ffffffffa0886162>] ? dlmconvert_master+0xe2/0x190 [ocfs2_dlm]
>>> [<ffffffffa08878bf>] ? dlmlock+0x7f/0xb70 [ocfs2_dlm]
>>> [<ffffffff81480e0a>] ? wait_for_common+0x13a/0x190
>>> [<ffffffff8104bc50>] ? try_to_wake_up+0x280/0x280
>>> [<ffffffffa0928a38>] ? __ocfs2_cluster_lock.clone.21+0x1d8/0x6b0 [ocfs2]
>>> [<ffffffffa0928fcc>] ? ocfs2_inode_lock_full_nested+0xbc/0x490 [ocfs2]
>>> [<ffffffffa0943c1b>] ? ocfs2_lookup_lock_orphan_dir+0x6b/0x1b0 [ocfs2]
>>> [<ffffffffa09454ba>] ? ocfs2_prepare_orphan_dir+0x4a/0x280 [ocfs2]
>>> [<ffffffffa094616f>] ? ocfs2_unlink+0x6ef/0xb90 [ocfs2]
>>> [<ffffffff811b35a9>] ? may_link.clone.22+0xd9/0x170
>>> [<ffffffff8113aa58>] ? vfs_unlink+0x98/0x100
>>> [<ffffffff8113ac41>] ? do_unlinkat+0x181/0x1b0
>>> [<ffffffff8113e7cd>] ? vfs_readdir+0x9d/0xe0
>>> [<ffffffff811653d8>] ? fsnotify_find_inode_mark+0x28/0x40
>>> [<ffffffff81166324>] ? dnotify_flush+0x54/0x110
>>> [<ffffffff8112b07f>] ? filp_close+0x5f/0x90
>>> [<ffffffff8148aa12>] ? system_call_fastpath+0x16/0x1b
>>>
>>>
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