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[Bug 1443325] [NEW] ISST-LTE:Ubuntu15.04: task aio-stress:12277 blocked for more than 120 seconds.

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From: Launchpad Bug Tracker <1443325@xxxxxxxxxxxxxxxxxx>
Date: Tue, 19 May 2015 18:02:44 -0000
Reply-to: Bug 1443325 <1443325@xxxxxxxxxxxxxxxxxx>
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== 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 ==

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bot-comment bugnameltc-123817 severity-medium targetmilestone-inin---
-- 
ISST-LTE:Ubuntu15.04: task aio-stress:12277 blocked for more than 120 seconds.
https://bugs.launchpad.net/bugs/1443325
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