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[Andrew Piziali <andy@xxxxxxxxxxxxxx>]

Running 3.2.0-55-generic, my system again hung this morning but the
evidence is increasingly pointing to either the X server (Xorg) or the
video device driver as the culprit.

As earlier, the keyboard became non-responsive (except the kernel magic
keys) and the mouse nearly non-responsive, the mouse cursor moving in
hesitant steps as the mouse was moved. I logged into the system from
another machine on the LAN to examine the running processes. avconv was
converting a video file (68% CPU), kworker/1:0 was consuming 62%, and
Xorg 52% on this Intel Core2 T5500 dual core mobile CPU. Suspecting the
X server from earlier observations, I examined its log file
(/var/log/Xorg.0.log):

...
[ 41368.758] [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
[ 41368.772] 
Backtrace:
[ 41369.118] 0: /usr/bin/X (xorg_backtrace+0x37) [0xe3e837]
[ 41369.118] 1: /usr/bin/X (mieqEnqueue+0x223) [0xe1cb83]
[ 41369.118] 2: /usr/bin/X (0xcb6000+0x4ccd5) [0xd02cd5]
[ 41369.118] 3: /usr/bin/X (xf86PostMotionEventM+0xf9) [0xd43d99]
[ 41369.118] 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x40e000+0x3c3d) [0x411c3d]
[ 41369.118] 5: /usr/lib/xorg/modules/input/evdev_drv.so (0x40e000+0x524f) [0x41324f]
[ 41369.118] 6: /usr/bin/X (0xcb6000+0x78381) [0xd2e381]
[ 41369.118] 7: /usr/bin/X (0xcb6000+0x9fce8) [0xd55ce8]
[ 41369.118] 8: (vdso) (__kernel_sigreturn+0x0) [0x1cf400]
[ 41369.118] 9: /usr/bin/X (0xcb6000+0x18cad0) [0xe42ad0]
[ 41369.118] 10: (vdso) (__kernel_sigreturn+0x0) [0x1cf400]
[ 41369.118] 11: (vdso) (__kernel_vsyscall+0x2) [0x1cf416]
[ 41369.118] 12: /lib/i386-linux-gnu/libc.so.6 (ioctl+0x19) [0x85a949]
[ 41369.118] 13: /usr/lib/i386-linux-gnu/libdrm.so.2 (drmIoctl+0x34) [0x2b79a4]
[ 41369.118] 14: /usr/lib/i386-linux-gnu/libdrm.so.2 (drmCommandNone+0x31) [0x2ba431]
[ 41369.119] 15: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x47e000+0xa705e) [0x52505e]
[ 41369.119] 16: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x51b8) [0x3fa1b8]
[ 41369.119] 17: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x5614) [0x3fa614]
[ 41369.119] 18: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x56c8) [0x3fa6c8]
[ 41369.119] 19: /usr/lib/xorg/modules/libexa.so (exaMoveOutPixmap+0x4c) [0x3f8e2c]
[ 41369.119] 20: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x5511) [0x3fa511]
[ 41369.119] 21: /usr/lib/xorg/modules/libexa.so (0x3f5000+0xca1e) [0x401a1e]
[ 41369.119] 22: /usr/lib/xorg/modules/libexa.so (exaOffscreenAlloc+0x20c) [0x401c4c]
[ 41369.119] 23: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x5a23) [0x3faa23]
[ 41369.119] 24: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x61b2) [0x3fb1b2]
[ 41369.119] 25: /usr/lib/xorg/modules/libexa.so (0x3f5000+0x3d1f) [0x3f8d1f]
[ 41369.119] 26: /usr/lib/xorg/modules/libexa.so (0x3f5000+0xe4a1) [0x4034a1]
[ 41369.119] 27: /usr/lib/xorg/modules/libexa.so (0x3f5000+0xf092) [0x404092]
[ 41369.119] 28: /usr/bin/X (0xcb6000+0x10d40b) [0xdc340b]
[ 41369.119] 29: /usr/bin/X (CompositePicture+0x21e) [0xdb5efe]
[ 41369.119] 30: /usr/bin/X (0xcb6000+0x10538c) [0xdbb38c]
[ 41369.119] 31: /usr/bin/X (0xcb6000+0x1007f1) [0xdb67f1]
[ 41369.119] 32: /usr/bin/X (0xcb6000+0x3791d) [0xced91d]
[ 41369.119] 33: /usr/bin/X (0xcb6000+0x2535a) [0xcdb35a]
[ 41369.119] 34: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0x78c4d3]
[ 41369.119] 35: /usr/bin/X (0xcb6000+0x25699) [0xcdb699]
[ 41369.119] [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
[ 41369.119] [mi] mieq is *NOT* the cause.  It is a victim.
...

These backtrace dumps repeated until the system was forcibly rebooted
using the kernel R-E-I-S-U-B magic key sequence. The X server ignored
signals HUP (1), TERM (15) and KILL (9).

How shall we proceed?

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1223055

Title:
  System Hangs With Kernel Migration Processes Consuming 100% CPU

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Once or twice a week, the system becomes non-responsive, with the
  mouse cursor tracking mouse movement but no keyboard response. Until
  today I would resort to using the kernel magic keys to reboot the
  system (R-E-I-S-U-B). Today I remotely logged in from another machine
  on the LAN and discovered that not only was the kernel alive and all
  processes running, but that the "migration/0" and "migration/1"
  processes were consuming 50% of the CPU each, as reported by top(1). I
  suspect this is why the system becomes non-responsive.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-generic 3.2.0.53.63
  ProcVersionSignature: Ubuntu 3.2.0-53.81-generic 3.2.50
  Uname: Linux 3.2.0-53-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  andy       2195 F.... pulseaudio
   /dev/snd/controlC0:  andy       2195 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xee400000 irq 47'
     Mixer name	: 'Analog Devices AD1981'
     Components	: 'HDA:11d41981,17aa2025,00100200'
     Controls      : 21
     Simple ctrls  : 12
  Card1.Amixer.info:
   Card hw:1 'U0x46d0x804'/'USB Device 0x46d:0x804 at usb-0000:00:1d.7-6.2.2, high speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USB046d:0804'
     Controls      : 2
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 6144
     Mono: Capture 4608 [75%] [24.00dB] [on]
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw 79HT50WW-1.07'
     Mixer name	: 'ThinkPad EC 79HT50WW-1.07'
     Components	: ''
     Controls      : 2
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
     Playback channels: Mono
     Limits: Playback 0 - 14
     Mono: Playback 7 [50%] [on]
  Date: Mon Sep  9 16:56:22 2013
  HibernationDevice: RESUME=UUID=5301c707-e227-46f3-8b49-a319582091a4
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  MachineType: LENOVO 8743CTO
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-53-generic root=UUID=a9ba509e-76a3-4c03-b898-0409f24233eb ro quiet splash nomodeset vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-53-generic N/A
   linux-backports-modules-3.2.0-53-generic  N/A
   linux-firmware                            1.79.6
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/05/2008
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7IET32WW (1.13 )
  dmi.board.name: 8743CTO
  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:bvr7IET32WW(1.13):bd02/05/2008:svnLENOVO:pn8743CTO:pvrThinkPadT60:rvnLENOVO:rn8743CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 8743CTO
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO

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