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[Jamie <451518@xxxxxxxxxxxxxxxxxx>]

Am seeing this on a Dell Optiplex 980 under karmic:

00:02.0 VGA compatible controller: Intel Corporation Clarkdale
Integrated Graphics Controller (rev 02)

[  838.848500] INFO: task i915/3:428 blocked for more than 120 seconds.
[  838.848506] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  838.848510] i915/3        D ffffffff815eb720     0   428      2 0x00000000
[  838.848517]  ffff88011046bda0 0000000000000046 0000000000000000 00000000ffffffff
[  838.848524]  ffff88011046bd30 ffffffff8104af6b ffff88010dce2d98 000000010000a007
[  838.848529]  ffff88010dce3110 000000000000f6e8 0000000000015580 ffff88010dce3110
[  838.848535] Call Trace:
[  838.848547]  [<ffffffff8104af6b>] ? dequeue_entity+0x1b/0x240
[  838.848555]  [<ffffffff815d3fd7>] __mutex_lock_slowpath+0xd7/0x160
[  838.848560]  [<ffffffff815d3ed6>] mutex_lock+0x26/0x50
[  838.848589]  [<ffffffffa00b8398>] i915_gem_retire_work_handler+0x38/0x90 [i915]
[  838.848608]  [<ffffffffa00b8360>] ? i915_gem_retire_work_handler+0x0/0x90 [i915]
[  838.848615]  [<ffffffff8106ca55>] worker_thread+0x165/0x290
[  838.848621]  [<ffffffff81071cb0>] ? autoremove_wake_function+0x0/0x40
[  838.848626]  [<ffffffff8106c8f0>] ? worker_thread+0x0/0x290
[  838.848631]  [<ffffffff810718c6>] kthread+0xa6/0xb0
[  838.848637]  [<ffffffff81012f8a>] child_rip+0xa/0x20
[  838.848642]  [<ffffffff81071820>] ? kthread+0x0/0xb0
[  838.848646]  [<ffffffff81012f80>] ? child_rip+0x0/0x20

May be related: saw several nfs timeout errors in the log at around the
same time.

-- 
[i945g] karmic: INFO: task i915/* blocked for more than 120 seconds.
https://bugs.launchpad.net/bugs/451518
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