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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1230041

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1230041

Title:
  i915_hotplug_work_func cause system crash

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  i915_hotplug_work_func cause system crash

  NoteBook:X200
  lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 13.04
  Release:	13.04
  Codename:	raring
   uname -a
  Linux julien-X200 3.8.0-30-generic #44-Ubuntu SMP Thu Aug 22 20:54:42 UTC 2013 i686 i686 i686 GNU/Linux

  Mostly the notebook crashes when it restore to work from "suspend" status. Occacionally it also stop work when I use firefox for some time.
  When the problem happens, I can not use keyboard, mouse and I can not switch to terminal mode through ctl+alt+F1~F6.
  I can ssh to the notebook from other pc, but I can not kill Xorg or reboot the notebook. The proc xorg in "uninterruptable sleep" staus.
  It seems i915_hotplug_work_func has dead lock.

  Information from dmesg:
  [ 2520.564119] INFO: task kworker/u:3:225 blocked for more than 120 seconds.
  [ 2520.564129] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 2520.564135] kworker/u:3     D 00000000     0   225      2 0x00000000
  [ 2520.564146]  f6f59e90 00000046 f68659b0 00000000 f6f59e48 c1010c58 c19c9100 dcb5da4d
  [ 2520.564165]  0000021d c19c9100 f7bc8100 f68659b0 00000002 a205ca2a 00000000 efbecfc0
  [ 2520.564181]  f6f59ed0 c1612d00 00000296 00000000 ed87c426 ef4cc000 c19c9100 00000001
  [ 2520.564198] Call Trace:
  [ 2520.564217]  [<c1010c58>] ? __switch_to+0x2a8/0x330
  [ 2520.564230]  [<c1612d00>] ? __schedule+0x360/0x780
  [ 2520.564242]  [<c103ce48>] ? default_spin_lock_flags+0x8/0x10
  [ 2520.564252]  [<c161427d>] ? _raw_spin_lock_irqsave+0x2d/0x40
  [ 2520.564269]  [<c16133c3>] schedule+0x23/0x60
  [ 2520.564278]  [<c161360d>] schedule_preempt_disabled+0xd/0x10
  [ 2520.564287]  [<c1612366>] __mutex_lock_slowpath+0xc6/0x120
  [ 2520.564295]  [<c1611ef4>] mutex_lock+0x24/0x40
  [ 2520.564344]  [<f8b03948>] i915_hotplug_work_func+0x28/0x90 [i915]
  [ 2520.564356]  [<c1064b5b>] ? cwq_dec_nr_in_flight+0x5b/0x90
  [ 2520.564366]  [<c1065785>] process_one_work+0x135/0x3e0
  [ 2520.564376]  [<c161b973>] ? common_interrupt+0x33/0x38
  [ 2520.564386]  [<c1066c99>] worker_thread+0x119/0x3c0
  [ 2520.564394]  [<c1066b80>] ? manage_workers+0x240/0x240
  [ 2520.564403]  [<c106b6d4>] kthread+0x94/0xa0
  [ 2520.564414]  [<c1070000>] ? __hrtimer_start_range_ns+0x1f0/0x460
  [ 2520.564424]  [<c161b3b7>] ret_from_kernel_thread+0x1b/0x28
  [ 2520.564432]  [<c106b640>] ? kthread_create_on_node+0xc0/0xc0
  [ 2520.564450] INFO: task Xorg:1283 blocked for more than 120 seconds.
  [ 2520.564455] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 2520.564459] Xorg            D 00000000     0  1283   1275 0x00400004
  [ 2520.564468]  ef4cdc90 00203086 f34035c0 00000000 000007ff f6f58000 c19c9100 dcb4371d
  [ 2520.564485]  0000021d c19c9100 f7bc8100 ed87c010 00000000 00000000 00000000 00000000
  [ 2520.564509]  00000000 00000000 00000000 00000000 f344f700 ef4cdcf0 ef4cdcfc c10867f9
  [ 2520.564525] Call Trace:
  [ 2520.564537]  [<c10867f9>] ? load_balance+0x99/0x670
  [ 2520.564546]  [<c16133c3>] schedule+0x23/0x60
  [ 2520.564555]  [<c1611b8d>] schedule_timeout+0x19d/0x240
  [ 2520.564565]  [<c1613241>] wait_for_common+0xa1/0x120
  [ 2520.564575]  [<c107c760>] ? try_to_wake_up+0x230/0x230
  [ 2520.564584]  [<c1613397>] wait_for_completion+0x17/0x20
  [ 2520.564594]  [<c1064ef7>] flush_workqueue+0xe7/0x330
  [ 2520.564604]  [<c1030000>] ? perf_ibs_start+0x10/0x120
  [ 2520.564613]  [<c1030101>] ? perf_ibs_start+0x111/0x120
  [ 2520.564658]  [<f8b299c7>] intel_crtc_page_flip+0x127/0x360 [i915]
  [ 2520.564671]  [<c114d953>] ? kmem_cache_alloc_trace+0x103/0x110
  [ 2520.564715]  [<f890c998>] drm_mode_page_flip_ioctl+0x238/0x310 [drm]
  [ 2520.564732]  [<c1611ee8>] ? mutex_lock+0x18/0x40
  [ 2520.564766]  [<f890c760>] ? drm_mode_gamma_get_ioctl+0xe0/0xe0 [drm]
  [ 2520.564794]  [<f88fceda>] drm_ioctl+0x42a/0x490 [drm]
  [ 2520.564830]  [<f890c760>] ? drm_mode_gamma_get_ioctl+0xe0/0xe0 [drm]
  [ 2520.564861]  [<f88fcab0>] ? drm_copy_field+0x80/0x80 [drm]
  [ 2520.564871]  [<c116fb90>] do_vfs_ioctl+0x80/0x580
  [ 2520.564900]  [<f88fd8f6>] ? drm_read+0xb6/0x160 [drm]
  [ 2520.564917]  [<c1050f33>] ? do_setitimer+0x123/0x210
  [ 2520.564927]  [<c1160505>] ? vfs_read+0xe5/0x160
  [ 2520.564955]  [<f88fd840>] ? drm_fasync+0x90/0x90 [drm]
  [ 2520.564964]  [<c11700fb>] sys_ioctl+0x6b/0x80
  [ 2520.564974]  [<c161b44d>] sysenter_do_call+0x12/0x28

  stack Information from proc kworker/u:3:225
  [<f8b03948>] i915_hotplug_work_func+0x28/0x90 [i915]
  [<c1065785>] process_one_work+0x135/0x3e0
  [<c1066c99>] worker_thread+0x119/0x3c0
  [<c106b6d4>] kthread+0x94/0xa0
  [<c161b3b7>] ret_from_kernel_thread+0x1b/0x28
  [<ffffffff>] 0xffffffff

  From the attached pictures,
  I915 has about 1300 intertups per seconds, and i915_hotplug_work_func take about 734 ms/s.

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