[Bug 494476] Re: "Smbd", "kjournald2" and "rsync" blocked for more than 120 seconds while using ext4.

[Lars]

Hi!

Last night the backup was interrupted again.
Our backup process timed out while waiting to be scheduled:

[71881.750043] INFO: task mbuffer:8637 blocked for more than 120 seconds.
[71881.750531] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[71881.751090] mbuffer1      D 0000000000000000     0  8637   4348 0x00000000
[71881.751094]  ffff8801ef339c18 0000000000000086 0000000000015bc0 0000000000015bc0
[71881.751098]  ffff880405c231a0 ffff8801ef339fd8 0000000000015bc0 ffff880405c22de0
[71881.751101]  0000000000015bc0 ffff8801ef339fd8 0000000000015bc0 ffff880405c231a0
[71881.751104] Call Trace:
[71881.751115]  [<ffffffff81558e2d>] schedule_timeout+0x22d/0x300
[71881.751120]  [<ffffffff812b5377>] ? kobject_put+0x27/0x60
[71881.751123]  [<ffffffff8155a985>] ? _spin_lock_irq+0x15/0x20
[71881.751128]  [<ffffffff8138b63a>] ? scsi_request_fn+0xda/0x5e0
[71881.751131]  [<ffffffff815580d6>] wait_for_common+0xd6/0x180
[...]

This was with »cfq«. This happened at about 80% backup done.
I switch back to »noop« and report again.

Lars

PS: We have no snapshots. There is no lvm device at all on this system.
(only SW-RAID6)

-- 
"Smbd","kjournald2" and  "rsync"  blocked for more than 120 seconds while using ext4.
https://bugs.launchpad.net/bugs/494476
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