[zfs-discuss] task z_wr_int_h blocked nfs issues

Brock Murch bmurch at mail.usf.edu
Sun Dec 6 14:43:15 EST 2015


Hello all.

All suggestions are appreciated.

Three times in the last 6 weeks (and specifically this Sunday and last), I 
have had zfs crash with these errors resulting in an unusable state. 

They appear to be zfs / nfs related.  rpc.idmapd mapping is lost as well (some 
users homes files are marked as nobody which is the default when maps are 
lost. (But this seems to happen frequently without the zfs failures and I 
can't figure that out either)

The last 2 failures (the only logs I can see) appeared in between a long 
smartd test the mirrored 500 GB SATA drives which not part of the zfs pool? 
It has not been scrubbed in a while but has been up since Jan 1, 2014 with 
few issues. 

Brock Murch

The ZFS pool is large group of 24 mirrored 4TB SAS drives:

[root at seahorse log]# zpool status tank
  pool: tank
 state: ONLINE
  scan: scrub repaired 0 in 152h58m with 0 errors on Fri Jun 20 09:38:51 2014
config:

        NAME                                               STATE     READ 
WRITE CKSUM
        tank                                            ONLINE       0     0     
0
          mirror-0                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a74d71-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a758c5-lun-0  ONLINE       0     
0     0
          mirror-1                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca0249305d1-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a74f1d-lun-0  ONLINE       0     
0     0
          mirror-2                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a75bad-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a744f9-lun-0  ONLINE       0     
0     0
          mirror-3                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a755f5-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a75731-lun-0  ONLINE       0     
0     0
          mirror-4                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a75c0d-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a757e9-lun-0  ONLINE       0     
0     0
          mirror-5                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a758f1-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a74ba1-lun-0  ONLINE       0     
0     0
          mirror-6                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a75875-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a74891-lun-0  ONLINE       0     
0     0
          mirror-7                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a7554d-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca0249c3501-lun-0  ONLINE       0     
0     0
          mirror-8                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca0248bf3b9-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a75239-lun-0  ONLINE       0     
0     0
          mirror-9                                         ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a36765-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a2ad8d-lun-0  ONLINE       0     
0     0
          mirror-10                                        ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a74701-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a73385-lun-0  ONLINE       0     
0     0
          mirror-11                                        ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a757a5-lun-0  ONLINE       0     
0     0
            pci-0000:06:00.0-sas-0x5000cca024a75a29-lun-0  ONLINE       0     
0     0

On 20151206
Dec  6 02:42:03 seahorse kernel: INFO: task z_wr_int_h/0:2331 blocked for more 
than 120 seconds.
Dec  6 02:42:03 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:03 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:03 seahorse kernel: z_wr_int_h/0  D 0000000000000000     0  2331      
2 0x00000000
Dec  6 02:42:03 seahorse kernel: ffff8808676d3b20 0000000000000046 
ffff88089c4168a8 ffff88089c416840
Dec  6 02:42:03 seahorse kernel: 0000000000000000 ffff8806abb9d9c0 
ffff8808676d3ac0 ffffffff81069384
Dec  6 02:42:03 seahorse kernel: ffff88086ec92638 ffff8808676d3fd8 
000000000000fbc8 ffff88086ec92638
Dec  6 02:42:03 seahorse kernel: Call Trace:
Dec  6 02:42:03 seahorse kernel: [<ffffffff81069384>] ? 
enqueue_task_fair+0x64/0x100
Dec  6 02:42:03 seahorse kernel: [<ffffffff81266c60>] ? 
generic_make_request+0x240/0x5a0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:03 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:03 seahorse kernel: [<ffffffffa031ace2>] 
txg_rele_to_sync+0x32/0x80 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa02db688>] dmu_tx_commit+0xd8/0x130 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa035c410>] 
zil_lwb_write_done+0x80/0x90 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa036407c>] zio_done+0x24c/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0317a1e>] ? 
spa_config_exit+0x7e/0xc0 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0325f51>] ? 
vdev_mirror_map_free+0x21/0x30 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0360ab3>] zio_execute+0xb3/0x140 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7628>] taskq_thread+0x218/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff81527920>] ? 
thread_return+0x4e/0x76e
Dec  6 02:42:03 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7410>] ? taskq_thread+0x0/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:03 seahorse kernel: INFO: task z_wr_int_h/1:2332 blocked for more 
than 120 seconds.
Dec  6 02:42:03 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:03 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:03 seahorse kernel: z_wr_int_h/1  D 0000000000000001     0  2332      
2 0x00000000
Dec  6 02:42:03 seahorse kernel: ffff8808676d5b20 0000000000000046 
0000000000000000 ffff880028216840
Dec  6 02:42:03 seahorse kernel: 0000000000000001 ffff88017ea19180 
ffff8808676d5ac0 ffffffff81069384
Dec  6 02:42:03 seahorse kernel: ffff88086ec29058 ffff8808676d5fd8 
000000000000fbc8 ffff88086ec29058
Dec  6 02:42:03 seahorse kernel: Call Trace:
Dec  6 02:42:03 seahorse kernel: [<ffffffff81069384>] ? 
enqueue_task_fair+0x64/0x100
Dec  6 02:42:03 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:03 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:03 seahorse kernel: [<ffffffffa031ace2>] 
txg_rele_to_sync+0x32/0x80 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa02db688>] dmu_tx_commit+0xd8/0x130 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa035c410>] 
zil_lwb_write_done+0x80/0x90 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa036407c>] zio_done+0x24c/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0317a1e>] ? 
spa_config_exit+0x7e/0xc0 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0325f51>] ? 
vdev_mirror_map_free+0x21/0x30 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0360ab3>] zio_execute+0xb3/0x140 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7628>] taskq_thread+0x218/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff81527920>] ? 
thread_return+0x4e/0x76e
Dec  6 02:42:03 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7410>] ? taskq_thread+0x0/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:03 seahorse kernel: INFO: task z_wr_int_h/2:2333 blocked for more 
than 120 seconds.
Dec  6 02:42:03 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:03 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:03 seahorse kernel: z_wr_int_h/2  D 0000000000000002     0  2333      
2 0x00000000
Dec  6 02:42:03 seahorse kernel: ffff8808676d7b20 0000000000000046 
ffff88086ec920b8 ffff880028216840
Dec  6 02:42:03 seahorse kernel: ffff8808676d7ae0 ffff88087457de00 
ffff8808676d7ac0 ffffffff8106941b
Dec  6 02:42:03 seahorse kernel: ffff8808711c9ab8 ffff8808676d7fd8 
000000000000fbc8 ffff8808711c9ab8
Dec  6 02:42:03 seahorse kernel: Call Trace:
Dec  6 02:42:03 seahorse kernel: [<ffffffff8106941b>] ? 
enqueue_task_fair+0xfb/0x100
Dec  6 02:42:03 seahorse kernel: [<ffffffff81266c60>] ? 
generic_make_request+0x240/0x5a0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:03 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:03 seahorse kernel: [<ffffffffa031ace2>] 
txg_rele_to_sync+0x32/0x80 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa02db688>] dmu_tx_commit+0xd8/0x130 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa035c410>] 
zil_lwb_write_done+0x80/0x90 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa036407c>] zio_done+0x24c/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0317a1e>] ? 
spa_config_exit+0x7e/0xc0 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0325f51>] ? 
vdev_mirror_map_free+0x21/0x30 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0360ab3>] zio_execute+0xb3/0x140 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7628>] taskq_thread+0x218/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff81527920>] ? 
thread_return+0x4e/0x76e
Dec  6 02:42:03 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7410>] ? taskq_thread+0x0/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:03 seahorse kernel: INFO: task z_wr_int_h/3:2334 blocked for more 
than 120 seconds.
Dec  6 02:42:03 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:03 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:03 seahorse kernel: z_wr_int_h/3  D 0000000000000003     0  2334      
2 0x00000000
Dec  6 02:42:03 seahorse kernel: ffff8808676d9b20 0000000000000046 
ffff8808676d9ae8 ffff8808676d9ae4
Dec  6 02:42:03 seahorse kernel: ffff8808676d9ae0 ffff88087fc24700 
ffff880028216840 0000000000000207
Dec  6 02:42:03 seahorse kernel: ffff88087162daf8 ffff8808676d9fd8 
000000000000fbc8 ffff88087162daf8
Dec  6 02:42:03 seahorse kernel: Call Trace:
Dec  6 02:42:03 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:03 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:03 seahorse kernel: [<ffffffffa031ace2>] 
txg_rele_to_sync+0x32/0x80 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa02db688>] dmu_tx_commit+0xd8/0x130 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa035c410>] 
zil_lwb_write_done+0x80/0x90 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa036407c>] zio_done+0x24c/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0317a1e>] ? 
spa_config_exit+0x7e/0xc0 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0325f51>] ? 
vdev_mirror_map_free+0x21/0x30 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0360ab3>] zio_execute+0xb3/0x140 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7628>] taskq_thread+0x218/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff81527920>] ? 
thread_return+0x4e/0x76e
Dec  6 02:42:03 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7410>] ? taskq_thread+0x0/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:03 seahorse kernel: INFO: task z_wr_int_h/4:2335 blocked for more 
than 120 seconds.
Dec  6 02:42:03 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:03 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:03 seahorse kernel: z_wr_int_h/4  D 0000000000000004     0  2335      
2 0x00000000
Dec  6 02:42:03 seahorse kernel: ffff8808676dbb20 0000000000000046 
0000000000000000 ffff88089c496840
Dec  6 02:42:03 seahorse kernel: 0000000000000004 ffff880fcc711680 
ffff8808676dbac0 ffffffff81069384
Dec  6 02:42:03 seahorse kernel: ffff88087129fab8 ffff8808676dbfd8 
000000000000fbc8 ffff88087129fab8
Dec  6 02:42:03 seahorse kernel: Call Trace:
Dec  6 02:42:03 seahorse kernel: [<ffffffff81069384>] ? 
enqueue_task_fair+0x64/0x100
Dec  6 02:42:03 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:03 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:03 seahorse kernel: [<ffffffffa031ace2>] 
txg_rele_to_sync+0x32/0x80 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa02db688>] dmu_tx_commit+0xd8/0x130 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa035c410>] 
zil_lwb_write_done+0x80/0x90 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa036407c>] zio_done+0x24c/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0317a1e>] ? 
spa_config_exit+0x7e/0xc0 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0325f51>] ? 
vdev_mirror_map_free+0x21/0x30 [zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0364517>] zio_done+0x6e7/0xd40 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa0360ab3>] zio_execute+0xb3/0x140 
[zfs]
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7628>] taskq_thread+0x218/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff81527920>] ? 
thread_return+0x4e/0x76e
Dec  6 02:42:03 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffffa01f7410>] ? taskq_thread+0x0/0x4b0 
[spl]
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:03 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:03 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:03 seahorse kernel: INFO: task txg_sync:2411 blocked for more 
than 120 seconds.
Dec  6 02:42:03 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:04 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:04 seahorse kernel: txg_sync      D 0000000000000002     0  2411      
2 0x00000000
Dec  6 02:42:04 seahorse kernel: ffff880868e4d9e0 0000000000000046 
0000000000000001 ffff88087120b930
Dec  6 02:42:04 seahorse kernel: 0000000000000000 0000000000000000 
ffff880868e4d960 ffffffff81065e02
Dec  6 02:42:04 seahorse kernel: ffff88086ec27af8 ffff880868e4dfd8 
000000000000fbc8 ffff88086ec27af8
Dec  6 02:42:04 seahorse kernel: Call Trace:
Dec  6 02:42:04 seahorse kernel: [<ffffffff81065e02>] ? 
default_wake_function+0x12/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffff810a70b1>] ? ktime_get_ts+0xb1/0xf0
Dec  6 02:42:04 seahorse kernel: [<ffffffff815280b3>] io_schedule+0x73/0xc0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01fe41c>] 
cv_wait_common+0xac/0x1c0 [spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0360a00>] ? zio_execute+0x0/0x140 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109b2b0>] ? 
autoremove_wake_function+0x0/0x40
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01fe548>] __cv_wait_io+0x18/0x20 
[spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0360c3b>] zio_wait+0xfb/0x1b0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c758d>] dbuf_read+0x3fd/0x750 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02cefc8>] dmu_buf_hold+0x108/0x1d0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa032fbe7>] zap_lockdir+0x57/0x730 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa03319ca>] 
zap_lookup_norm+0x4a/0x190 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81528f1e>] ? mutex_lock+0x1e/0x50
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0331ba3>] zap_lookup+0x33/0x40 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0331c2f>] 
spa_feature_is_active+0x7f/0x90 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff810a70b1>] ? ktime_get_ts+0xb1/0xf0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02f9c63>] 
dsl_scan_active+0x63/0xc0 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa031b51b>] 
txg_sync_thread+0x11b/0x590 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81059329>] ? 
set_user_nice+0xc9/0x130
Dec  6 02:42:04 seahorse kernel: [<ffffffffa031b400>] ? 
txg_sync_thread+0x0/0x590 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01f6478>] 
thread_generic_wrapper+0x68/0x80 [spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01f6410>] ? 
thread_generic_wrapper+0x0/0x80 [spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:04 seahorse kernel: INFO: task nfsd4:13212 blocked for more than 
120 seconds.
Dec  6 02:42:04 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:04 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:04 seahorse kernel: nfsd4         D 0000000000000000     0 13212      
2 0x00000080
Dec  6 02:42:04 seahorse kernel: ffff88081f86dd30 0000000000000046 
0000000000000000 ffff88087fc24100
Dec  6 02:42:04 seahorse kernel: ffff88081f86dd70 ffffffff81060b13 
0000000000000000 0000000000000200
Dec  6 02:42:04 seahorse kernel: ffff8808231e1098 ffff88081f86dfd8 
000000000000fbc8 ffff8808231e1098
Dec  6 02:42:04 seahorse kernel: Call Trace:
Dec  6 02:42:04 seahorse kernel: [<ffffffff81060b13>] ? 
perf_event_task_sched_out+0x33/0x70
Dec  6 02:42:04 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f73d0>] ? 
laundromat_main+0x0/0x3f0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f2ee5>] 
nfs4_lock_state+0x15/0x20 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f73fa>] 
laundromat_main+0x2a/0x3f0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f73d0>] ? 
laundromat_main+0x0/0x3f0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81094d30>] 
worker_thread+0x170/0x2a0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109b2b0>] ? 
autoremove_wake_function+0x0/0x40
Dec  6 02:42:04 seahorse kernel: [<ffffffff81094bc0>] ? 
worker_thread+0x0/0x2a0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:04 seahorse kernel: INFO: task nfsd:13214 blocked for more than 
120 seconds.
Dec  6 02:42:04 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:04 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:04 seahorse kernel: nfsd          D 0000000000000002     0 13214      
2 0x00000080
Dec  6 02:42:04 seahorse kernel: ffff8806f395b950 0000000000000046 
0000000000000000 0000000000000202
Dec  6 02:42:04 seahorse kernel: ffff8806f395b8e0 ffffffffa02c5686 
ffff88058b6011c0 0000000000000002
Dec  6 02:42:04 seahorse kernel: ffff880821054638 ffff8806f395bfd8 
000000000000fbc8 ffff880821054638
Dec  6 02:42:04 seahorse kernel: Call Trace:
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c5686>] ? 
RW_WRITE_HELD+0x66/0xb0 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8152908e>] 
__mutex_lock_slowpath+0x13e/0x180
Dec  6 02:42:04 seahorse kernel: [<ffffffff81528f2b>] mutex_lock+0x2b/0x50
Dec  6 02:42:04 seahorse kernel: [<ffffffffa031a8d8>] txg_hold_open+0x48/0x80 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02dba25>] 
dmu_tx_assign+0x205/0x4e0 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02dcb96>] ? 
dmu_tx_hold_sa+0x166/0x190 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa034e857>] 
zfs_dirty_inode+0xa7/0x260 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff811a5260>] ? iput+0x30/0x70
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d7800>] ? 
nfsd_acceptable+0x0/0x120 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07cf5e8>] ? 
find_acceptable_alias+0x28/0x100 [exportfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07cf759>] ? 
exportfs_decode_fh+0x99/0x2bc [exportfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0369220>] 
zpl_dirty_inode+0x10/0x20 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff811b490b>] 
__mark_inode_dirty+0x3b/0x160
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0367f22>] zpl_release+0x42/0x80 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8118a735>] __fput+0xf5/0x210
Dec  6 02:42:04 seahorse kernel: [<ffffffff8118a875>] fput+0x25/0x30
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f1894>] 
__nfs4_file_put_access+0x44/0x90 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f18fb>] 
nfs4_file_put_access+0x1b/0x50 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f573d>] 
free_generic_stateid+0x5d/0xe0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f623b>] 
release_open_stateid+0x4b/0x60 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f67f1>] nfsd4_close+0xc1/0x140 
[nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07e7458>] 
nfsd4_proc_compound+0x3d8/0x490 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4425>] nfsd_dispatch+0xe5/0x230 
[nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0594844>] 
svc_process_common+0x344/0x640 [sunrpc]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0594e80>] svc_process+0x110/0x160 
[sunrpc]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4b52>] nfsd+0xc2/0x160 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4a90>] ? nfsd+0x0/0x160 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:04 seahorse kernel: INFO: task nfsd:13215 blocked for more than 
120 seconds.
Dec  6 02:42:04 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:04 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:04 seahorse kernel: nfsd          D 0000000000000001     0 13215      
2 0x00000080
Dec  6 02:42:04 seahorse kernel: ffff8806f5a9b5d0 0000000000000046 
0000000000000000 ffffffffa0325a40
Dec  6 02:42:04 seahorse kernel: ffff880051d82250 00000002a52c5218 
0000000000000004 00000000a035f4e3
Dec  6 02:42:04 seahorse kernel: ffff88081faae5f8 ffff8806f5a9bfd8 
000000000000fbc8 ffff88081faae5f8
Dec  6 02:42:04 seahorse kernel: Call Trace:
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0325a40>] ? 
vdev_mirror_child_done+0x0/0x30 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff815280b3>] io_schedule+0x73/0xc0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01fe41c>] 
cv_wait_common+0xac/0x1c0 [spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109b2b0>] ? 
autoremove_wake_function+0x0/0x40
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01fe548>] __cv_wait_io+0x18/0x20 
[spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0360c3b>] zio_wait+0xfb/0x1b0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c758d>] dbuf_read+0x3fd/0x750 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c6639>] ? 
dbuf_rele_and_unlock+0x169/0x210 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c7a69>] 
__dbuf_hold_impl+0x189/0x480 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c7de6>] dbuf_hold_impl+0x86/0xc0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c8ed0>] dbuf_hold+0x20/0x30 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02cef57>] dmu_buf_hold+0x97/0x1d0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa032fbe7>] zap_lockdir+0x57/0x730 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c73c9>] ? dbuf_read+0x239/0x750 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0331874>] 
zap_cursor_retrieve+0x1e4/0x2f0 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0306123>] ? 
sa_lookup_impl+0x13/0x20 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa03061ed>] ? sa_lookup+0x4d/0x60 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa03521b2>] zfs_readdir+0x172/0x500 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8112f3b3>] ? 
__alloc_pages_nodemask+0x113/0x8d0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d7982>] ? 
nfsd_setuser_and_check_port+0x62/0xb0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07cf7bd>] ? 
exportfs_decode_fh+0xfd/0x2bc [exportfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0367e48>] zpl_readdir+0x58/0x80 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d8c40>] ? 
nfsd_buffered_filldir+0x0/0x70 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81186232>] ? dentry_open+0x52/0xc0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d8c40>] ? 
nfsd_buffered_filldir+0x0/0x70 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8119f000>] vfs_readdir+0xc0/0xe0
Dec  6 02:42:04 seahorse kernel: [<ffffffff81167aaa>] ? 
alloc_pages_current+0xaa/0x110
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f0f10>] ? 
nfsd4_encode_dirent+0x0/0x2d0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07dae36>] nfsd_readdir+0xd6/0x240 
[nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07ef5e4>] 
nfsd4_encode_readdir+0x144/0x250 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07e9435>] 
nfsd4_encode_operation+0x75/0x180 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07e7215>] 
nfsd4_proc_compound+0x195/0x490 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4425>] nfsd_dispatch+0xe5/0x230 
[nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0594844>] 
svc_process_common+0x344/0x640 [sunrpc]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0594e80>] svc_process+0x110/0x160 
[sunrpc]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4b52>] nfsd+0xc2/0x160 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4a90>] ? nfsd+0x0/0x160 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20
Dec  6 02:42:04 seahorse kernel: INFO: task nfsd:13216 blocked for more than 
120 seconds.
Dec  6 02:42:04 seahorse kernel:      Tainted: P           ---------------    
2.6.32-431.3.1.el6.x86_64 #1
Dec  6 02:42:04 seahorse kernel: "echo 0 
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec  6 02:42:04 seahorse kernel: nfsd          D 0000000000000002     0 13216      
2 0x00000080
Dec  6 02:42:04 seahorse kernel: ffff8806f3bbd5d0 0000000000000046 
0000000000000000 ffffffffa0325a40
Dec  6 02:42:04 seahorse kernel: ffff8800693d7f70 00000002ed8687b8 
0000000000000004 00000000a035f4e3
Dec  6 02:42:04 seahorse kernel: ffff88081fb19af8 ffff8806f3bbdfd8 
000000000000fbc8 ffff88081fb19af8
Dec  6 02:42:04 seahorse kernel: Call Trace:
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0325a40>] ? 
vdev_mirror_child_done+0x0/0x30 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff815280b3>] io_schedule+0x73/0xc0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01fe41c>] 
cv_wait_common+0xac/0x1c0 [spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109b2b0>] ? 
autoremove_wake_function+0x0/0x40
Dec  6 02:42:04 seahorse kernel: [<ffffffffa01fe548>] __cv_wait_io+0x18/0x20 
[spl]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0360c3b>] zio_wait+0xfb/0x1b0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c758d>] dbuf_read+0x3fd/0x750 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c6639>] ? 
dbuf_rele_and_unlock+0x169/0x210 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c7a69>] 
__dbuf_hold_impl+0x189/0x480 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c7de6>] dbuf_hold_impl+0x86/0xc0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c8ed0>] dbuf_hold+0x20/0x30 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02cef57>] dmu_buf_hold+0x97/0x1d0 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa032fbe7>] zap_lockdir+0x57/0x730 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa02c73c9>] ? dbuf_read+0x239/0x750 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0331874>] 
zap_cursor_retrieve+0x1e4/0x2f0 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0306123>] ? 
sa_lookup_impl+0x13/0x20 [zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa03061ed>] ? sa_lookup+0x4d/0x60 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa03521b2>] zfs_readdir+0x172/0x500 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8112f3b3>] ? 
__alloc_pages_nodemask+0x113/0x8d0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d7982>] ? 
nfsd_setuser_and_check_port+0x62/0xb0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07cf7bd>] ? 
exportfs_decode_fh+0xfd/0x2bc [exportfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0367e48>] zpl_readdir+0x58/0x80 
[zfs]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d8c40>] ? 
nfsd_buffered_filldir+0x0/0x70 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81186232>] ? dentry_open+0x52/0xc0
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d8c40>] ? 
nfsd_buffered_filldir+0x0/0x70 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8119f000>] vfs_readdir+0xc0/0xe0
Dec  6 02:42:04 seahorse kernel: [<ffffffff81167aaa>] ? 
alloc_pages_current+0xaa/0x110
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07f0f10>] ? 
nfsd4_encode_dirent+0x0/0x2d0 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07dae36>] nfsd_readdir+0xd6/0x240 
[nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07ef5e4>] 
nfsd4_encode_readdir+0x144/0x250 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07e9435>] 
nfsd4_encode_operation+0x75/0x180 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07e7215>] 
nfsd4_proc_compound+0x195/0x490 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4425>] nfsd_dispatch+0xe5/0x230 
[nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0594844>] 
svc_process_common+0x344/0x640 [sunrpc]
Dec  6 02:42:04 seahorse kernel: [<ffffffff81065df0>] ? 
default_wake_function+0x0/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffffa0594e80>] svc_process+0x110/0x160 
[sunrpc]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4b52>] nfsd+0xc2/0x160 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffffa07d4a90>] ? nfsd+0x0/0x160 [nfsd]
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109af06>] kthread+0x96/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c20a>] child_rip+0xa/0x20
Dec  6 02:42:04 seahorse kernel: [<ffffffff8109ae70>] ? kthread+0x0/0xa0
Dec  6 02:42:04 seahorse kernel: [<ffffffff8100c200>] ? child_rip+0x0/0x20


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