Comment 30 for bug 1097315

Strike the above comment about quantal kernels not showing this. I just saw it with 3.7.0-7-generic:

[ 3000.776154] INFO: task Xorg:1758 blocked for more than 120 seconds.
[ 3000.776163] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3000.776168] Xorg D ffff88013bc93e40 0 1758 1679 0x00400000
[ 3000.776178] ffff880132a23ac0 0000000000000002 ffff880130545c00 ffff880132a23fd8
[ 3000.776187] ffff880132a23fd8 ffff880132a23fd8 ffff880135b35c00 ffff880130545c00
[ 3000.776195] ffff88012fe7c000 ffff88013037ee68 ffff88012fe7a800 0000000000000001
[ 3000.776203] Call Trace:
[ 3000.776219] [<ffffffff816a4ee9>] schedule+0x29/0x70
[ 3000.776296] [<ffffffffa00cefe5>] intel_crtc_wait_for_pending_flips+0x75/0xd0 [i915]
[ 3000.776307] [<ffffffff8107c6c0>] ? finish_wait+0x80/0x80
[ 3000.776348] [<ffffffffa00d1647>] i9xx_crtc_disable+0x87/0x180 [i915]
[ 3000.776390] [<ffffffffa00d5ae0>] intel_crtc_disable+0x30/0x120 [i915]
[ 3000.776433] [<ffffffffa00d84cf>] intel_set_mode+0x24f/0x960 [i915]
[ 3000.776450] [<ffffffff8117739d>] ? __kmalloc+0x13d/0x170
[ 3000.776491] [<ffffffffa00d8d31>] ? intel_crtc_set_config+0x151/0x970 [i915]
[ 3000.776533] [<ffffffffa00d9306>] intel_crtc_set_config+0x726/0x970 [i915]
[ 3000.776576] [<ffffffffa004f119>] drm_mode_setcrtc+0x119/0x5a0 [drm]
[ 3000.776585] [<ffffffff816a379d>] ? mutex_lock+0x1d/0x50
[ 3000.776620] [<ffffffffa004b996>] ? drm_mode_object_find+0x66/0x90 [drm]
[ 3000.776652] [<ffffffffa003f553>] drm_ioctl+0x4d3/0x580 [drm]
[ 3000.776689] [<ffffffffa004f000>] ? drm_mode_setplane+0x370/0x370 [drm]
[ 3000.776699] [<ffffffff8119d0c9>] do_vfs_ioctl+0x99/0x590
[ 3000.776706] [<ffffffff8119d651>] sys_ioctl+0x91/0xb0
[ 3000.776714] [<ffffffff816ae75d>] system_call_fastpath+0x1a/0x1f
[ 3120.776190] INFO: task Xorg:1758 blocked for more than 120 seconds.
[ 3120.776199] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3120.776204] Xorg D ffff88013bc93e40 0 1758 1679 0x00400000
[ 3120.776214] ffff880132a23ac0 0000000000000002 ffff880130545c00 ffff880132a23fd8
[ 3120.776223] ffff880132a23fd8 ffff880132a23fd8 ffff880135b35c00 ffff880130545c00
[ 3120.776231] ffff88012fe7c000 ffff88013037ee68 ffff88012fe7a800 0000000000000001
[ 3120.776238] Call Trace:
[ 3120.776255] [<ffffffff816a4ee9>] schedule+0x29/0x70
[ 3120.776333] [<ffffffffa00cefe5>] intel_crtc_wait_for_pending_flips+0x75/0xd0 [i915]
[ 3120.776343] [<ffffffff8107c6c0>] ? finish_wait+0x80/0x80
[ 3120.776385] [<ffffffffa00d1647>] i9xx_crtc_disable+0x87/0x180 [i915]
[ 3120.776427] [<ffffffffa00d5ae0>] intel_crtc_disable+0x30/0x120 [i915]
[ 3120.776470] [<ffffffffa00d84cf>] intel_set_mode+0x24f/0x960 [i915]
[ 3120.776487] [<ffffffff8117739d>] ? __kmalloc+0x13d/0x170
[ 3120.776528] [<ffffffffa00d8d31>] ? intel_crtc_set_config+0x151/0x970 [i915]
[ 3120.776570] [<ffffffffa00d9306>] intel_crtc_set_config+0x726/0x970 [i915]
[ 3120.776612] [<ffffffffa004f119>] drm_mode_setcrtc+0x119/0x5a0 [drm]
[ 3120.776621] [<ffffffff816a379d>] ? mutex_lock+0x1d/0x50
[ 3120.776657] [<ffffffffa004b996>] ? drm_mode_object_find+0x66/0x90 [drm]
[ 3120.776688] [<ffffffffa003f553>] drm_ioctl+0x4d3/0x580 [drm]
[ 3120.776726] [<ffffffffa004f000>] ? drm_mode_setplane+0x370/0x370 [drm]
[ 3120.776735] [<ffffffff8119d0c9>] do_vfs_ioctl+0x99/0x590
[ 3120.776742] [<ffffffff8119d651>] sys_ioctl+0x91/0xb0
[ 3120.776750] [<ffffffff816ae75d>] system_call_fastpath+0x1a/0x1f
[ 3240.776154] INFO: task Xorg:1758 blocked for more than 120 seconds.
[ 3240.776164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3240.776169] Xorg D ffff88013bc93e40 0 1758 1679 0x00400000
[ 3240.776179] ffff880132a23ac0 0000000000000002 ffff880130545c00 ffff880132a23fd8
[ 3240.776188] ffff880132a23fd8 ffff880132a23fd8 ffff880135b35c00 ffff880130545c00
[ 3240.776195] ffff88012fe7c000 ffff88013037ee68 ffff88012fe7a800 0000000000000001
[ 3240.776203] Call Trace:
[ 3240.776219] [<ffffffff816a4ee9>] schedule+0x29/0x70
[ 3240.776297] [<ffffffffa00cefe5>] intel_crtc_wait_for_pending_flips+0x75/0xd0 [i915]
[ 3240.776307] [<ffffffff8107c6c0>] ? finish_wait+0x80/0x80
[ 3240.776348] [<ffffffffa00d1647>] i9xx_crtc_disable+0x87/0x180 [i915]
[ 3240.776390] [<ffffffffa00d5ae0>] intel_crtc_disable+0x30/0x120 [i915]
[ 3240.776433] [<ffffffffa00d84cf>] intel_set_mode+0x24f/0x960 [i915]
[ 3240.776450] [<ffffffff8117739d>] ? __kmalloc+0x13d/0x170
[ 3240.776491] [<ffffffffa00d8d31>] ? intel_crtc_set_config+0x151/0x970 [i915]
[ 3240.776533] [<ffffffffa00d9306>] intel_crtc_set_config+0x726/0x970 [i915]
[ 3240.776574] [<ffffffffa004f119>] drm_mode_setcrtc+0x119/0x5a0 [drm]
[ 3240.776583] [<ffffffff816a379d>] ? mutex_lock+0x1d/0x50
[ 3240.776619] [<ffffffffa004b996>] ? drm_mode_object_find+0x66/0x90 [drm]
[ 3240.776651] [<ffffffffa003f553>] drm_ioctl+0x4d3/0x580 [drm]
[ 3240.776688] [<ffffffffa004f000>] ? drm_mode_setplane+0x370/0x370 [drm]
[ 3240.776698] [<ffffffff8119d0c9>] do_vfs_ioctl+0x99/0x590
[ 3240.776705] [<ffffffff8119d651>] sys_ioctl+0x91/0xb0
[ 3240.776713] [<ffffffff816ae75d>] system_call_fastpath+0x1a/0x1f