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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1242587

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1242587

Title:
  Kernel error while writing to iscsi ext4 filesystem

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Filesytem got blocked because a kernel error.

  IT seems that the systems goes offline mode and readonly while
  writting heavily to the filesystem.

  This is a vmachine over an amd64 system.

  Linux red-maas 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:12:00 UTC
  2013 i686 athlon i686 GNU/Linux

  Ubuntu 3.11.0-12.19-generic 3.11.3

  Ubuntu saucy just installed and up to date.

  I got following while writing to iscsi filesystem:

      5.777528] iscsi: registered transport (tcp)
  [    5.813107] iscsi: registered transport (iser)
  [    6.154085] scsi2 : iSCSI Initiator over TCP/IP
  [    6.425038] scsi 2:0:0:0: Direct-Access     QNAP     VIRTUAL-DISK     0    PQ: 0 ANSI: 4
  [    6.438196] sd 2:0:0:0: Attached scsi generic sg1 type 0
  [    6.439018] sd 2:0:0:0: [sda] 67108864 512-byte logical blocks: (34.3 GB/32.0 GiB)
  [    6.440972] sd 2:0:0:0: [sda] Write Protect is off
  [    6.440984] sd 2:0:0:0: [sda] Mode Sense: 77 00 00 08
  [    6.441899] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  [    6.445312]  sda: sda1
  [    6.447584] sd 2:0:0:0: [sda] Attached SCSI disk
  [    7.070225] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
  [    8.898245] postgres (1251): /proc/1251/oom_adj is deprecated, please use /proc/1251/oom_score_adj instead.
  [  594.707838] EXT4-fs (loop0): mounted filesystem with ordered data mode. Opts: (null)
  [ 1320.592146] INFO: task jbd2/sda1-8:895 blocked for more than 120 seconds.
  [ 1320.592727] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 1320.593378] jbd2/sda1-8     D f68fd580     0   895      2 0x00000000
  [ 1320.593391]  f3e51dc4 00000046 00000000 f68fd580 f3c0a4b0 f68fd580 f3e03380 c1a3d600
  [ 1320.593405]  c18d69a0 000048f6 c1a3d600 f6fee600 f3e03380 00062c96 f3e51d80 c1044467
  [ 1320.593417]  f3e51dbc c10a2838 56cc0dcc 000048f6 ffffffff 00000017 4216743b 00055b7e
  [ 1320.593428] Call Trace:
  [ 1320.593448]  [<c1044467>] ? kvm_clock_get_cycles+0x17/0x20
  [ 1320.593459]  [<c10a2838>] ? ktime_get_ts+0x48/0x140
  [ 1320.593471]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1320.593481]  [<c1629f36>] io_schedule+0x86/0x100
  [ 1320.593488]  [<c1193bed>] sleep_on_buffer+0xd/0x20
  [ 1320.593498]  [<c1628061>] __wait_on_bit+0x51/0x70
  [ 1320.593505]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1320.593512]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1320.593521]  [<c16280db>] out_of_line_wait_on_bit+0x5b/0x70
  [ 1320.593531]  [<c1070cb0>] ? wake_atomic_t_function+0x50/0x50
  [ 1320.593538]  [<c119470e>] __wait_on_buffer+0x2e/0x30
  [ 1320.593549]  [<c123b01c>] jbd2_journal_commit_transaction+0x14ac/0x1630
  [ 1320.593558]  [<c107bf21>] ? finish_task_switch+0x41/0xc0
  [ 1320.593567]  [<c1070c3c>] ? autoremove_wake_function+0x1c/0x40
  [ 1320.593577]  [<c105e752>] ? try_to_del_timer_sync+0x42/0x60
  [ 1320.593586]  [<c123ec00>] kjournald2+0xa0/0x210
  [ 1320.593594]  [<c1070c20>] ? wake_up_atomic_t+0x30/0x30
  [ 1320.593602]  [<c123eb60>] ? commit_timeout+0x10/0x10
  [ 1320.593609]  [<c1070164>] kthread+0x94/0xa0
  [ 1320.593617]  [<c1070000>] ? __kthread_parkme+0x60/0x70
  [ 1320.593625]  [<c1632c37>] ret_from_kernel_thread+0x1b/0x28
  [ 1320.593633]  [<c10700d0>] ? kthread_create_on_node+0xc0/0xc0
  [ 1414.914717]  connection1:0: pdu (op 0x5b itt 0x1) rejected. Reason code 0x7
  [ 1440.592343] INFO: task jbd2/sda1-8:895 blocked for more than 120 seconds.
  [ 1440.592907] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 1440.593600] jbd2/sda1-8     D f68fd580     0   895      2 0x00000000
  [ 1440.593612]  f3e51dc4 00000046 00000000 f68fd580 f3c0a4b0 f68fd580 f3e03380 c1a3d600
  [ 1440.593626]  c18d69a0 000048f6 c1a3d600 f6fee600 f3e03380 00062c96 f3e51d80 c1044467
  [ 1440.593637]  f3e51dbc c10a2838 56cc0dcc 000048f6 ffffffff 00000017 4216743b 00055b7e
  [ 1440.593648] Call Trace:
  [ 1440.593669]  [<c1044467>] ? kvm_clock_get_cycles+0x17/0x20
  [ 1440.593680]  [<c10a2838>] ? ktime_get_ts+0x48/0x140
  [ 1440.593691]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1440.593700]  [<c1629f36>] io_schedule+0x86/0x100
  [ 1440.593708]  [<c1193bed>] sleep_on_buffer+0xd/0x20
  [ 1440.593717]  [<c1628061>] __wait_on_bit+0x51/0x70
  [ 1440.593724]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1440.593731]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1440.593740]  [<c16280db>] out_of_line_wait_on_bit+0x5b/0x70
  [ 1440.593749]  [<c1070cb0>] ? wake_atomic_t_function+0x50/0x50
  [ 1440.593757]  [<c119470e>] __wait_on_buffer+0x2e/0x30
  [ 1440.593768]  [<c123b01c>] jbd2_journal_commit_transaction+0x14ac/0x1630
  [ 1440.593777]  [<c107bf21>] ? finish_task_switch+0x41/0xc0
  [ 1440.593786]  [<c1070c3c>] ? autoremove_wake_function+0x1c/0x40
  [ 1440.593796]  [<c105e752>] ? try_to_del_timer_sync+0x42/0x60
  [ 1440.593804]  [<c123ec00>] kjournald2+0xa0/0x210
  [ 1440.593813]  [<c1070c20>] ? wake_up_atomic_t+0x30/0x30
  [ 1440.593821]  [<c123eb60>] ? commit_timeout+0x10/0x10
  [ 1440.593828]  [<c1070164>] kthread+0x94/0xa0
  [ 1440.593836]  [<c1070000>] ? __kthread_parkme+0x60/0x70
  [ 1440.593844]  [<c1632c37>] ret_from_kernel_thread+0x1b/0x28
  [ 1440.593852]  [<c10700d0>] ? kthread_create_on_node+0xc0/0xc0
  [ 1560.593069] INFO: task jbd2/sda1-8:895 blocked for more than 120 seconds.
  [ 1560.593626] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 1560.594335] jbd2/sda1-8     D f68fd580     0   895      2 0x00000000
  [ 1560.594401]  f3e51dc4 00000046 00000000 f68fd580 f3c0a4b0 f68fd580 f3e03380 c1a3d600
  [ 1560.594429]  c18d69a0 000048f6 c1a3d600 f6fee600 f3e03380 00062c96 f3e51d80 c1044467
  [ 1560.594441]  f3e51dbc c10a2838 56cc0dcc 000048f6 ffffffff 00000017 4216743b 00055b7e
  [ 1560.594453] Call Trace:
  [ 1560.594474]  [<c1044467>] ? kvm_clock_get_cycles+0x17/0x20
  [ 1560.594485]  [<c10a2838>] ? ktime_get_ts+0x48/0x140
  [ 1560.594496]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1560.594505]  [<c1629f36>] io_schedule+0x86/0x100
  [ 1560.594513]  [<c1193bed>] sleep_on_buffer+0xd/0x20
  [ 1560.594523]  [<c1628061>] __wait_on_bit+0x51/0x70
  [ 1560.594530]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1560.594537]  [<c1193be0>] ? generic_block_bmap+0x60/0x60
  [ 1560.594546]  [<c16280db>] out_of_line_wait_on_bit+0x5b/0x70
  [ 1560.594555]  [<c1070cb0>] ? wake_atomic_t_function+0x50/0x50
  [ 1560.594563]  [<c119470e>] __wait_on_buffer+0x2e/0x30
  [ 1560.594574]  [<c123b01c>] jbd2_journal_commit_transaction+0x14ac/0x1630
  [ 1560.594583]  [<c107bf21>] ? finish_task_switch+0x41/0xc0
  [ 1560.594592]  [<c1070c3c>] ? autoremove_wake_function+0x1c/0x40
  [ 1560.594602]  [<c105e752>] ? try_to_del_timer_sync+0x42/0x60
  [ 1560.594610]  [<c123ec00>] kjournald2+0xa0/0x210
  [ 1560.594619]  [<c1070c20>] ? wake_up_atomic_t+0x30/0x30
  [ 1560.594627]  [<c123eb60>] ? commit_timeout+0x10/0x10
  [ 1560.594634]  [<c1070164>] kthread+0x94/0xa0
  [ 1560.594642]  [<c1070000>] ? __kthread_parkme+0x60/0x70
  [ 1560.594650]  [<c1632c37>] ret_from_kernel_thread+0x1b/0x28
  [ 1560.594658]  [<c10700d0>] ? kthread_create_on_node+0xc0/0xc0
  [ 1560.594705] INFO: task celeryd:1788 blocked for more than 120 seconds.
  [ 1560.595270] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 1560.595942] celeryd         D f3baded0     0  1788    543 0x00000000
  [ 1560.595950]  f3badef4 00200086 00000101 f3baded0 f3254dfc 00002fef 00000000 c1a3d600
  [ 1560.595962]  d17fcd2d 00000148 c1a3d600 f6fee600 f3bb0000 c1122097 0000000e f3badedc
  [ 1560.595972]  00000003 f3badf20 c11173c4 00000001 0000000e 00000001 f3cb885c f3baded4
  [ 1560.595982] Call Trace:
  [ 1560.596002]  [<c1122097>] ? pagevec_lookup_tag+0x27/0x30
  [ 1560.596056]  [<c11173c4>] ? filemap_fdatawait_range+0xf4/0x140
  [ 1560.596064]  [<c10451d8>] ? default_spin_lock_flags+0x8/0x10
  [ 1560.596073]  [<c1070a38>] ? prepare_to_wait+0x48/0x70
  [ 1560.596079]  [<c1629ca3>] schedule+0x23/0x60
  [ 1560.596088]  [<c123e685>] jbd2_log_wait_commit+0x95/0x100
  [ 1560.596096]  [<c1070c20>] ? wake_up_atomic_t+0x30/0x30
  [ 1560.596105]  [<c12407d6>] jbd2_complete_transaction+0x46/0x80
  [ 1560.596115]  [<c11e9ee0>] ext4_sync_file+0x250/0x2d0
  [ 1560.596124]  [<c11e9c90>] ? ext4_file_write+0x480/0x480
  [ 1560.596133]  [<c1192663>] vfs_fsync+0x33/0x50
  [ 1560.596141]  [<c1192828>] do_fsync+0x28/0x50
  [ 1560.596150]  [<c1192a85>] SyS_fdatasync+0x15/0x20
  [ 1560.596157]  [<c1632ccd>] sysenter_do_call+0x12/0x28
  [ 1565.385540] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385550] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385553] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385557] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385559] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385562] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385565] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385568] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385570] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385608] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385613] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385616] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385618] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385621] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385624] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385627] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385629] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385632] sd 2:0:0:0: Device offlined - not ready after error recovery
  [ 1565.385643] sd 2:0:0:0: [sda] Unhandled error code
  [ 1565.385647] sd 2:0:0:0: [sda]

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