[Bug 628530] Re: 10.04 LTS Servers Hang with task kjournald blocked for more than 120 seconds

[Craig Box]

I was getting a similar error (io_schedule/sync_buffer, filesystem
unusably slow) on a c1.medium EC2 instance. I removed irqbalanced and
rebooting and quickly crashed like this:

[  480.722484] INFO: task apache2:822 blocked for more than 120 seconds.
[  480.722498] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  480.722505] apache2       D 00004000     0   822    762 0x00000000
[  480.722510]  ec1a9e58 00000282 00000000 00004000 c055ac00 00000000 00031ab5 00000000
[  480.722517]  c06ea1c0 ec20b2ec c06ea1c0 c06ea1c0 c06ea1c0 ec20b2ec c06ea1c0 c06ea1c0
[  480.722522]  ebcb5040 00000041 ec20b040 ec844d00 c1ceaa64 00000000 ec1a9e3c 00000000
[  480.722532] Call Trace:
[  480.722542]  [<c05297b4>] __mutex_lock_slowpath+0xd4/0x140
[  480.722559]  [<c0529619>] mutex_lock+0x19/0x30
[  480.722564]  [<c019801f>] generic_file_aio_write+0x3f/0xb0
[  480.722568]  [<c01cdb0c>] do_sync_write+0xbc/0x100
[  480.722573]  [<c014c5c0>] ? autoremove_wake_function+0x0/0x40
[  480.722579]  [<c0393f3f>] ? security_file_permission+0xf/0x20
[  480.722582]  [<c01cdcad>] ? rw_verify_area+0x5d/0xd0
[  480.722585]  [<c01cddba>] vfs_write+0x9a/0x190
[  480.722587]  [<c01cda50>] ? do_sync_write+0x0/0x100
[  480.722590]  [<c01ce7dd>] sys_write+0x3d/0x70
[  480.722593]  [<c01047e0>] syscall_call+0x7/0xb

-- 
10.04 LTS Servers Hang with task kjournald blocked for more than 120 seconds
https://bugs.launchpad.net/bugs/628530
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