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[Dagfinn Ilmari Mannsåker <ilmari@xxxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

Occasionally X hangs completely, not even SAK will kill it, however SAK
followed by ctrl-alt-del successfully switches to the shutdown splash.

When this happens, the following shows up in dmesg:

[ 5169.457964] INFO: task i915:302 blocked for more than 120 seconds.
[ 5169.457970] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 5169.457974] i915          D 00000000ffffffff     0   302      2 0x00000000
[ 5169.457981]  ffff88022e0d9d20 0000000000000046 0000000000015bc0 0000000000015bc0
[ 5169.457988]  ffff88022f791ab0 ffff88022e0d9fd8 0000000000015bc0 ffff88022f7916f0
[ 5169.457994]  0000000000015bc0 ffff88022e0d9fd8 0000000000015bc0 ffff88022f791ab0
[ 5169.458000] Call Trace:
[ 5169.458015]  [<ffffffff8153f867>] __mutex_lock_slowpath+0xe7/0x170
[ 5169.458021]  [<ffffffff8153f75b>] mutex_lock+0x2b/0x50
[ 5169.458063]  [<ffffffffa00d5550>] intel_idle_update+0x60/0x1d0 [i915]
[ 5169.458085]  [<ffffffffa00d54f0>] ? intel_idle_update+0x0/0x1d0 [i915]
[ 5169.458095]  [<ffffffff81080777>] run_workqueue+0xc7/0x1a0
[ 5169.458101]  [<ffffffff810808f3>] worker_thread+0xa3/0x110
[ 5169.458107]  [<ffffffff81085320>] ? autoremove_wake_function+0x0/0x40
[ 5169.458113]  [<ffffffff81080850>] ? worker_thread+0x0/0x110
[ 5169.458117]  [<ffffffff81084fa6>] kthread+0x96/0xa0
[ 5169.458124]  [<ffffffff810141ea>] child_rip+0xa/0x20
[ 5169.458129]  [<ffffffff81084f10>] ? kthread+0x0/0xa0
[ 5169.458133]  [<ffffffff810141e0>] ? child_rip+0x0/0x20
[ 5169.458154] INFO: task Xorg:1364 blocked for more than 120 seconds.
[ 5169.458157] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 5169.458160] Xorg          D 0000000000000000     0  1364   1263 0x00400004
[ 5169.458166]  ffff88020bd13ca8 0000000000000082 0000000000015bc0 0000000000015bc0
[ 5169.458172]  ffff880208c74890 ffff88020bd13fd8 0000000000015bc0 ffff880208c744d0
[ 5169.458177]  0000000000015bc0 ffff88020bd13fd8 0000000000015bc0 ffff880208c74890
[ 5169.458183] Call Trace:
[ 5169.458189]  [<ffffffff8153f867>] __mutex_lock_slowpath+0xe7/0x170
[ 5169.458195]  [<ffffffff8153f75b>] mutex_lock+0x2b/0x50
[ 5169.458214]  [<ffffffffa00c3435>] i915_gem_madvise_ioctl+0x55/0x160 [i915]
[ 5169.458231]  [<ffffffffa006de2a>] drm_ioctl+0x27a/0x480 [drm]
[ 5169.458250]  [<ffffffffa00c33e0>] ? i915_gem_madvise_ioctl+0x0/0x160 [i915]
[ 5169.458256]  [<ffffffff81085320>] ? autoremove_wake_function+0x0/0x40
[ 5169.458264]  [<ffffffff81152a92>] vfs_ioctl+0x22/0xa0
[ 5169.458269]  [<ffffffff81152d41>] do_vfs_ioctl+0x81/0x380
[ 5169.458274]  [<ffffffff811431df>] ? vfs_read+0x12f/0x1a0
[ 5169.458279]  [<ffffffff811530c1>] sys_ioctl+0x81/0xa0
[ 5169.458286]  [<ffffffff810131b2>] system_call_fastpath+0x16/0x1b

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
[arrandale] deadlock in i915_gem_madvise_ioctl
https://bugs.launchpad.net/bugs/568138
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