This has been affecting me approximately every 1-2 hours. Full details
and discussion can be found http://askubuntu.com/questions/838855
/crashing-freezing-hanging-on-remove-stuck-pageflip at that stack
overflow Q/A.

Macbook Pro A5102
OS: Ubuntu 16.04 LTS
Memory: 7.7GiB
Processor: Intel Core i5-5257u CPU @ 2.7GHz x 4
Graphics: Intel Iris 6100 (Broadwell GT3)
Os type: 64-bit
Disk: 37.0GB
uname -a: Linux caleb-ubuntu 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 
13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
uname -r: 4.4.0-43-generic

Oct 19 11:13:18 caleb-ubuntu smartd[693]: Device: /dev/sda [SAT], SMART Usage 
Attribute: 194 Temperature_Celsius changed from 54 to 55
Oct 19 11:15:23 caleb-ubuntu kernel: [ 1928.576209] thunderbolt 0000:07:00.0: 
resetting error on 0:b.
Oct 19 11:15:23 caleb-ubuntu kernel: [ 1928.576223] thunderbolt 0000:07:00.0: 
0:b: hotplug: scanning
Oct 19 11:15:23 caleb-ubuntu kernel: [ 1928.576226] thunderbolt 0000:07:00.0: 
0:b: hotplug: no switch found

Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112344] ------------[ cut here 
]------------
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112370] WARNING: CPU: 2 PID: 1033 
at /build/linux-e0bh4_/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:3963 
intel_crtc_wait_for_pending_flips+0x1e2/0x240 [i915]()
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112371] 
WARN_ON(wait_event_timeout(dev_priv->pending_flip_queue, 
!intel_crtc_has_pending_flip(crtc), 60*HZ) == 0)
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112373] Modules linked in: btrfs 
xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c cpuid 
rfcomm nvram bnep btusb btrtl btbcm joydev btintel input_leds bcm5974 bluetooth 
msr binfmt_misc nls_iso8859_1 applesmc intel_rapl x86_pkg_temp_thermal 
input_polldev intel_powerclamp coretemp kvm_intel kvm irqbypass 
crct10dif_pclmul crc32_pclmul brcmfmac brcmutil snd_hda_codec_cirrus cfg80211 
snd_hda_codec_generic aesni_intel aes_x86_64 lrw snd_hda_codec_hdmi gf128mul 
glue_helper ablk_helper cryptd bdc_pci thunderbolt snd_hda_intel snd_hda_codec 
lpc_ich intel_pch_thermal shpchp mei_me snd_hda_core mei snd_hwdep snd_pcm 
snd_seq_midi snd_seq_midi_event snd_rawmidi acpi_als kfifo_buf snd_seq sbs 
industrialio sbshc snd_seq_device snd_timer spi_pxa2xx_platform apple_bl snd 
soundcore mac_hid parport_pc ppdev lp parport autofs4 hid_apple hid_generic 
usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea ahci sysfillrect uas 
libahci sysimgblt
  fb_sys_fops usb_storage drm fjes video
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112414] CPU: 2 PID: 1033 Comm: Xorg 
Not tainted 4.4.0-42-generic #62-Ubuntu
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112416] Hardware name: Apple Inc. 
MacBookPro12,1/Mac-E43C1C25D4880AD6, BIOS MBP121.88Z.0167.B16.1602111810 
02/11/2016
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112417]  0000000000000286 
000000004413e07b ffff88003533faa0 ffffffff813f1f83
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112419]  ffff88003533fae8 
ffffffffc020eab8 ffff88003533fad8 ffffffff81081212
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112420]  ffff880264f629a8 
ffff8800357b9030 ffff880264822000 ffff880264f62800
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112421] Call Trace:
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112426]  [<ffffffff813f1f83>] 
dump_stack+0x63/0x90
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112428]  [<ffffffff81081212>] 
warn_slowpath_common+0x82/0xc0
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112430]  [<ffffffff810812ac>] 
warn_slowpath_fmt+0x5c/0x80
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112432]  [<ffffffff810c3935>] ? 
finish_wait+0x55/0x70
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112447]  [<ffffffffc01a92a2>] 
intel_crtc_wait_for_pending_flips+0x1e2/0x240 [i915]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112449]  [<ffffffff810c3dd0>] ? 
wake_atomic_t_function+0x60/0x60
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112461]  [<ffffffffc01aa521>] 
intel_pre_plane_update+0x111/0x140 [i915]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112473]  [<ffffffffc01aacf2>] 
intel_atomic_commit+0x352/0x6f0 [i915]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112488]  [<ffffffffc003cbde>] ? 
drm_atomic_check_only+0x18e/0x590 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112499]  [<ffffffffc003d017>] 
drm_atomic_commit+0x37/0x60 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112505]  [<ffffffffc0104939>] 
drm_atomic_helper_disable_plane+0xa9/0xf0 [drm_kms_helper]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112514]  [<ffffffffc002c269>] 
__setplane_internal+0x169/0x250 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112524]  [<ffffffffc003b79a>] ? 
drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112533]  [<ffffffffc0030056>] 
drm_mode_setplane+0x136/0x1b0 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112540]  [<ffffffffc0021752>] 
drm_ioctl+0x152/0x540 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112549]  [<ffffffffc002ff20>] ? 
drm_plane_check_pixel_format+0x50/0x50 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112553]  [<ffffffff8122122f>] 
do_vfs_ioctl+0x29f/0x490
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112555]  [<ffffffff8120fdd1>] ? 
__sb_end_write+0x21/0x30
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112557]  [<ffffffff8120d9dd>] ? 
vfs_write+0x15d/0x1a0
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112558]  [<ffffffff81221499>] 
SyS_ioctl+0x79/0x90
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112561]  [<ffffffff818318b2>] 
entry_SYSCALL_64_fastpath+0x16/0x71
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112562] ---[ end trace 
c2690206b3e3a010 ]---
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112563] ------------[ cut here 
]------------
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112580] WARNING: CPU: 2 PID: 1033 
at /build/linux-e0bh4_/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:3968 
intel_crtc_wait_for_pending_flips+0x233/0x240 [i915]()
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112581] Removing stuck page flip
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112581] Modules linked in: btrfs 
xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c cpuid 
rfcomm nvram bnep btusb btrtl btbcm joydev btintel input_leds bcm5974 bluetooth 
msr binfmt_misc nls_iso8859_1 applesmc intel_rapl x86_pkg_temp_thermal 
input_polldev intel_powerclamp coretemp kvm_intel kvm irqbypass 
crct10dif_pclmul crc32_pclmul brcmfmac brcmutil snd_hda_codec_cirrus cfg80211 
snd_hda_codec_generic aesni_intel aes_x86_64 lrw snd_hda_codec_hdmi gf128mul 
glue_helper ablk_helper cryptd bdc_pci thunderbolt snd_hda_intel snd_hda_codec 
lpc_ich intel_pch_thermal shpchp mei_me snd_hda_core mei snd_hwdep snd_pcm 
snd_seq_midi snd_seq_midi_event snd_rawmidi acpi_als kfifo_buf snd_seq sbs 
industrialio sbshc snd_seq_device snd_timer spi_pxa2xx_platform apple_bl snd 
soundcore mac_hid parport_pc ppdev lp parport autofs4 hid_apple hid_generic 
usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea ahci sysfillrect uas 
libahci sysimgblt
  fb_sys_fops usb_storage drm fjes video
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112610] CPU: 2 PID: 1033 Comm: Xorg 
Tainted: G        W       4.4.0-42-generic #62-Ubuntu
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112610] Hardware name: Apple Inc. 
MacBookPro12,1/Mac-E43C1C25D4880AD6, BIOS MBP121.88Z.0167.B16.1602111810 
02/11/2016
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112611]  0000000000000086 
000000004413e07b ffff88003533faa0 ffffffff813f1f83
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112613]  ffff88003533fae8 
ffffffffc020eab8 ffff88003533fad8 ffffffff81081212
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112614]  ffff880264f629a8 
ffff8800357b9030 ffff880264822000 ffff880264f62800
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112616] Call Trace:
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112618]  [<ffffffff813f1f83>] 
dump_stack+0x63/0x90
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112620]  [<ffffffff81081212>] 
warn_slowpath_common+0x82/0xc0
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112622]  [<ffffffff810812ac>] 
warn_slowpath_fmt+0x5c/0x80
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112624]  [<ffffffff810c3935>] ? 
finish_wait+0x55/0x70
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112639]  [<ffffffffc01a92f3>] 
intel_crtc_wait_for_pending_flips+0x233/0x240 [i915]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112641]  [<ffffffff810c3dd0>] ? 
wake_atomic_t_function+0x60/0x60
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112657]  [<ffffffffc01aa521>] 
intel_pre_plane_update+0x111/0x140 [i915]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112672]  [<ffffffffc01aacf2>] 
intel_atomic_commit+0x352/0x6f0 [i915]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112683]  [<ffffffffc003cbde>] ? 
drm_atomic_check_only+0x18e/0x590 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112694]  [<ffffffffc003d017>] 
drm_atomic_commit+0x37/0x60 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112699]  [<ffffffffc0104939>] 
drm_atomic_helper_disable_plane+0xa9/0xf0 [drm_kms_helper]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112707]  [<ffffffffc002c269>] 
__setplane_internal+0x169/0x250 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112717]  [<ffffffffc003b79a>] ? 
drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112727]  [<ffffffffc0030056>] 
drm_mode_setplane+0x136/0x1b0 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112734]  [<ffffffffc0021752>] 
drm_ioctl+0x152/0x540 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112743]  [<ffffffffc002ff20>] ? 
drm_plane_check_pixel_format+0x50/0x50 [drm]
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112745]  [<ffffffff8122122f>] 
do_vfs_ioctl+0x29f/0x490
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112746]  [<ffffffff8120fdd1>] ? 
__sb_end_write+0x21/0x30
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112748]  [<ffffffff8120d9dd>] ? 
vfs_write+0x15d/0x1a0
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112749]  [<ffffffff81221499>] 
SyS_ioctl+0x79/0x90
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112751]  [<ffffffff818318b2>] 
entry_SYSCALL_64_fastpath+0x16/0x71
Oct 19 11:15:49 caleb-ubuntu kernel: [ 1954.112752] ---[ end trace 
c2690206b3e3a011 ]---
[drm:intel_dp_link_training_clock_recovery [i915]] *ERROR* failed to enable 
link training
Oct 19 11:15:56 caleb-ubuntu kernel: [ 1961.138660] 
[drm:intel_dp_link_training_channel_equalization [i915]] *ERROR* failed to 
start channel equalization

Oct 19 11:16:04 caleb-ubuntu kernel: [ 1969.019894] thunderbolt 0000:07:00.0: 
resetting error on 0:b.
Oct 19 11:16:04 caleb-ubuntu kernel: [ 1969.019905] thunderbolt 0000:07:00.0: 
0:b: got unplug event for disconnected port, ignoring

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1384342

Title:
  kernel messages intel_crtc_wait_for_pending_flips correlate to compiz
  hang

Status in Linux:
  Unknown
Status in System76:
  New
Status in xf86-video-intel:
  Fix Released
Status in linux package in Ubuntu:
  Triaged
Status in linux package in Debian:
  Confirmed
Status in linux package in Fedora:
  Unknown
Status in linux package in openSUSE:
  Unknown

Bug description:
  I am fairly frequently (maybe once every 2 days) seeing screen
  lockups.  The system is fine, and then screen locks up. mouse is still
  movable and even changes icon based on content under it (ie mouse over
  link changes to pointing hand).  Programs are still running (often
  this occurs during a google hangout, and the hangout, audio and mic
  seem to work fine).

  Today when this happened I had more patience and hit ctrl-alt-f1, and then 
subsequently saw that dmesg had:
  [82218.556025] ------------[ cut here ]------------
  [82218.556074] WARNING: CPU: 0 PID: 8799 at 
/build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_display.c:3324 
intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]()
  [82218.556095] Modules linked in: xt_conntrack ipt_REJECT overlayfs pci_stub 
vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM 
iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 
nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter 
ip_tables x_tables rfcomm bnep binfmt_misc dm_crypt uvcvideo videobuf2_vmalloc 
videobuf2_memops videobuf2_core v4l2_common videodev media dm_multipath scsi_dh 
coretemp kvm_intel kvm arc4 joydev iwldvm mac80211 serio_raw btusb bluetooth 
pcmcia 6lowpan_iphc thinkpad_acpi snd_seq_midi snd_seq_midi_event nvram 
snd_hda_codec_conexant snd_hda_codec_generic r852 sm_common lpc_ich nand 
snd_rawmidi nand_ecc nand_bch snd_hda_intel bch nand_ids snd_hda_controller 
snd_hda_codec snd_hwdep mtd snd_seq iwlwifi r592 memstick snd_pcm
  [82218.556112]  yenta_socket pcmcia_rsrc pcmcia_core cfg80211 snd_seq_device 
shpchp snd_timer mei_me mei snd soundcore mac_hid parport_pc ppdev tp_smapi(OE) 
thinkpad_ec(OE) lp parport btrfs raid10 raid456 async_raid6_recov async_memcpy 
async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear 
hid_generic usbhid hid psmouse firewire_ohci ahci libahci firewire_core 
sdhci_pci sdhci crc_itu_t i915 wmi e1000e i2c_algo_bit drm_kms_helper video drm 
ptp pps_core pata_acpi [last unloaded: ipmi_msghandler]
  [82218.556114] CPU: 0 PID: 8799 Comm: kworker/0:1 Tainted: G        W  OE 
3.16.0-23-generic #30-Ubuntu
  [82218.556115] Hardware name: LENOVO 7417CTO/7417CTO, BIOS 7UET94WW (3.24 ) 
10/17/2012
  [82218.556119] Workqueue: events console_callback
  [82218.556122]  0000000000000009 ffff880016a3faf8 ffffffff8177fcbc 
0000000000000000
  [82218.556123]  ffff880016a3fb30 ffffffff8106fd8d 0000000000000000 
ffff880035a5a000
  [82218.556124]  ffff880035948210 ffff880035826800 ffff880035826800 
ffff880016a3fb40
  [82218.556125] Call Trace:
  [82218.556130]  [<ffffffff8177fcbc>] dump_stack+0x45/0x56
  [82218.556133]  [<ffffffff8106fd8d>] warn_slowpath_common+0x7d/0xa0
  [82218.556135]  [<ffffffff8106fe6a>] warn_slowpath_null+0x1a/0x20
  [82218.556153]  [<ffffffffc015dffc>] 
intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]
  [82218.556156]  [<ffffffff810b9590>] ? prepare_to_wait_event+0x100/0x100
  [82218.556175]  [<ffffffffc0160ac3>] intel_crtc_disable_planes+0x33/0x1c0 
[i915]
  [82218.556177]  [<ffffffff81784e5b>] ? __ww_mutex_lock+0x1b/0xb0
  [82218.556196]  [<ffffffffc0160ca1>] i9xx_crtc_disable+0x51/0x3f0 [i915]
  [82218.556220]  [<ffffffffc0162457>] intel_crtc_update_dpms+0x67/0xa0 [i915]
  [82218.556237]  [<ffffffffc0166ac9>] intel_connector_dpms+0x59/0x70 [i915]
  [82218.556245]  [<ffffffffc00c4901>] drm_fb_helper_dpms.isra.5+0xc1/0x100 
[drm_kms_helper]
  [82218.556251]  [<ffffffffc00c4971>] drm_fb_helper_blank+0x31/0x90 
[drm_kms_helper]
  [82218.556254]  [<ffffffff81415d47>] fb_blank+0x57/0xc0
  [82218.556256]  [<ffffffff8140c87b>] fbcon_blank+0xfb/0x300
  [82218.556258]  [<ffffffff8108b4a2>] ? __queue_delayed_work+0x182/0x1c0
  [82218.556259]  [<ffffffff8108b7b9>] ? try_to_grab_pending+0xa9/0x160
  [82218.556262]  [<ffffffff8107cbdb>] ? lock_timer_base.isra.34+0x2b/0x50
  [82218.556264]  [<ffffffff8107dd1f>] ? try_to_del_timer_sync+0x4f/0x70
  [82218.556266]  [<ffffffff81497ba3>] do_blank_screen+0x1d3/0x280
  [82218.556267]  [<ffffffff8149a348>] console_callback+0x68/0x160
  [82218.556269]  [<ffffffff8108d8e2>] process_one_work+0x182/0x4e0
  [82218.556270]  [<ffffffff8108dcab>] worker_thread+0x6b/0x6a0
  [82218.556272]  [<ffffffff8178294d>] ? __schedule+0x39d/0x890
  [82218.556273]  [<ffffffff8108dc40>] ? process_one_work+0x4e0/0x4e0
  [82218.556275]  [<ffffffff81094aeb>] kthread+0xdb/0x100
  [82218.556277]  [<ffffffff81094a10>] ? kthread_create_on_node+0x1c0/0x1c0
  [82218.556278]  [<ffffffff81787c3c>] ret_from_fork+0x7c/0xb0
  [82218.556280]  [<ffffffff81094a10>] ? kthread_create_on_node+0x1c0/0x1c0
  [82218.556281] ---[ end trace b9c751133032cf61 ]---

  /var/log/Xorg.0.log had:
  [ 83252.384] (EE) Backtrace:
  [ 83253.063] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f80649a0666]
  [ 83253.063] (EE) 1: /usr/bin/X (0x7f80647ea000+0x1ba869) [0x7f80649a4869]
  [ 83253.063] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f806251f000+0x36da0) 
[0x7f8062555da0]
  [ 83253.063] (EE) 3: /usr/bin/X (0x7f80647ea000+0x1378ec) [0x7f80649218ec]
  [ 83253.063] (EE) 4: /usr/bin/X (0x7f80647ea000+0x137d0c) [0x7f8064921d0c]
  [ 83253.063] (EE) 5: /usr/bin/X (0x7f80647ea000+0x137243) [0x7f8064921243]
  [ 83253.064] (EE) 6: /usr/bin/X (0x7f80647ea000+0xe9fa8) [0x7f80648d3fa8]
  [ 83253.064] (EE) 7: /usr/bin/X (0x7f80647ea000+0x1358fc) [0x7f806491f8fc]
  [ 83253.064] (EE) 8: /usr/bin/X (0x7f80647ea000+0x5b3b7) [0x7f80648453b7]
  [ 83253.064] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) 
[0x7f8062540ec5]
  [ 83253.064] (EE) 10: /usr/bin/X (0x7f80647ea000+0x456ae) [0x7f806482f6ae]
  [ 83253.064] (EE)
  [ 83253.115] (EE) Segmentation fault at address 0x10


  Normally, I'm generally able to switch consoles in and out of X
  without problem. I do not know if the above trace is related to X
  being locked or not.

  I'll also attach the /var/log/Xorg.0.log.old that had some information
  in it also andapparent segfault.  That said, I think all log
  information is tens of seconds after the lock up and might be a result
  of me ctrl-alt-1 <-> ctrl-alt-f7 while system was in a borked state.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-23-generic 3.16.0-23.30
  ProcVersionSignature: Ubuntu 3.16.0-23.30-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   smoser     4134 F...m pulseaudio
   /dev/snd/pcmC0D0p:   smoser     4134 F...m pulseaudio
   /dev/snd/controlC0:  smoser     4134 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Oct 22 10:29:16 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-10-19 (1099 days ago)
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MachineType: LENOVO 7417CTO
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic 
root=UUID=f9832678-e9fb-41c5-8edb-5edd5200ed0a ro quiet splash nomdmonddf 
nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-23-generic N/A
   linux-backports-modules-3.16.0-23-generic  N/A
   linux-firmware                             1.136
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2013-05-20 (520 days ago)
  dmi.bios.date: 10/17/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7UET94WW (3.24 )
  dmi.board.name: 7417CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvr7UET94WW(3.24):bd10/17/2012:svnLENOVO:pn7417CTO:pvrThinkPadT400:rvnLENOVO:rn7417CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7417CTO
  dmi.product.version: ThinkPad T400
  dmi.sys.vendor: LENOVO

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