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[Mathieu Trudel-Lapierre <mathieu.tl@xxxxxxxxx>]

Reassigning to the linux package; the kernel team would more likely know
if there is a fix available for this.

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1443325

Title:
  ISST-LTE:Ubuntu15.04: task aio-stress:12277 blocked for more than 120
  seconds.

Status in linux package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Hemant Kumar <hemantkbajaj@xxxxxxxxxx> - 2015-04-13 01:29:44 ==
  Defect Description:
  ===============

  I am having one ubuntu 15.04 LE lpar running with regression
  run(BASE/IO/TCP). After some hours of run i was not able to get
  virtual terminal of lpar but i am able to login via ssh. I did ssh and
  i saw these stack traces in dmesg:

  [14889.385371] blk_update_request: critical target error, dev dm-10, sector 13842352
  [14889.385389] dm-16: WRITE SAME failed. Manually zeroing.
  [16080.244960] INFO: task aio-stress:12275 blocked for more than 120 seconds.
  [16080.244976]       Not tainted 3.19.0-12-generic #12-Ubuntu
  [16080.244979] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [16080.244983] aio-stress      D 00003fff7e420818     0 12275  12092 0x00040000
  [16080.244985] Call Trace:
  [16080.244989] [c0000007704633f0] [c000000000015a4c] __switch_to+0x1fc/0x350
  [16080.244992] [c000000770463440] [c000000000a3601c] __schedule+0x37c/0x8d0
  [16080.244994] [c000000770463670] [c000000000a3a8b4] schedule_timeout+0x254/0x2f0
  [16080.244996] [c000000770463760] [c000000000a377dc] wait_for_common+0xec/0x240
  [16080.244998] [c0000007704637e0] [c0000000002ff1c8] writeback_inodes_sb_nr+0xb8/0xe0
  [16080.245000] [c000000770463880] [c0000000002ffa78] try_to_writeback_inodes_sb_nr+0x98/0xd0
  [16080.245002] [c0000007704638c0] [c0000000003774bc] ext4_nonda_switch+0xdc/0xf0
  [16080.245004] [c000000770463900] [c00000000037e340] ext4_da_write_begin+0x90/0x3d0
  [16080.245006] [c0000007704639c0] [c0000000002134f4] generic_perform_write+0xf4/0x280
  [16080.245008] [c000000770463a60] [c0000000002159e0] __generic_file_write_iter+0x2a0/0x430
  [16080.245009] [c000000770463ac0] [c000000000371428] ext4_file_write_iter+0x118/0x480
  [16080.245011] [c000000770463b80] [c000000000329c78] aio_run_iocb+0x268/0x450
  [16080.245013] [c000000770463ce0] [c00000000032afc4] do_io_submit+0x294/0x670
  [16080.245015] [c000000770463e30] [c000000000009258] syscall_exit+0x0/0x98
  [16080.245017] INFO: task aio-stress:12276 blocked for more than 120 seconds.
  [16080.245022]       Not tainted 3.19.0-12-generic #12-Ubuntu
  [16080.245025] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

  
  I am running IO regression run from last many weeks but i have not seen this issue in any previous kernel. 

  root@riverlp1:~# cat /etc/issue
  Ubuntu Vivid Vervet (development branch) \n \l

  
  root@riverlp1:~# uname -a
  Linux riverlp1 3.19.0-12-generic #12-Ubuntu SMP Fri Apr 3 04:03:54 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
  root@riverlp1:~#

  
  Contact Info: hemantkbajaj@xxxxxxxxxx

  == Comment: #1 - Hemant Kumar <hemantkbajaj@xxxxxxxxxx> - 2015-04-13
  01:32:40 ==

  
  == Comment: #2 - Hemant Kumar <hemantkbajaj@xxxxxxxxxx> - 2015-04-13 01:35:52 ==

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