Public bug reported: I was trying to diagnose a bug with workspaces and moving around from desktop to desktop when the screen suddenly froze (no corruption, just stopped updating). Could not vt switch, but could ssh in and file this bug report from the console. Looking at dmesg appears to be a drm fault.
[ 1332.008002] INFO: rcu_sched detected stall on CPU 0 (t=15000 jiffies) [ 1332.008003] Pid: 2574, comm: Xorg Not tainted 3.2.0-4-generic-pae #10-Ubuntu [ 1332.008003] Call Trace: [ 1332.008003] [<c158f18c>] ? printk+0x2d/0x2f [ 1332.008003] [<c10c50e3>] check_cpu_stall.isra.36+0x93/0xe0 [ 1332.008003] [<c10c515a>] __rcu_pending+0x2a/0x140 [ 1332.008003] [<c10c550c>] rcu_check_callbacks+0x6c/0x1d0 [ 1332.008003] [<c1069c0b>] update_process_times+0x3b/0x70 [ 1332.008003] [<c108b03e>] tick_sched_timer+0x5e/0xc0 [ 1332.008003] [<c107cf90>] ? __remove_hrtimer+0x40/0xa0 [ 1332.008003] [<c107d6bf>] __run_hrtimer+0x6f/0x1b0 [ 1332.008003] [<c108afe0>] ? tick_nohz_handler+0x100/0x100 [ 1332.008003] [<c107e035>] hrtimer_interrupt+0xe5/0x260 [ 1332.008003] [<c15ac3a4>] smp_apic_timer_interrupt+0x54/0x88 [ 1332.008003] [<c15a50e9>] apic_timer_interrupt+0x31/0x38 [ 1332.008003] [<c15a00e0>] ? get_ranges+0xcb/0x10e [ 1332.008003] [<f8a7d0f6>] ? i915_gem_get_aperture_ioctl+0x66/0xb0 [i915] [ 1332.008003] [<f8974f28>] drm_ioctl+0x378/0x480 [drm] [ 1332.008003] [<f8a7d090>] ? i915_gem_init_ioctl+0x80/0x80 [i915] [ 1332.008003] [<c117b278>] ? fsnotify+0x198/0x250 [ 1332.008003] [<f8974bb0>] ? drm_copy_field+0x80/0x80 [drm] [ 1332.008003] [<c1154139>] do_vfs_ioctl+0x79/0x2d0 [ 1332.008003] [<c1143830>] ? wait_on_retry_sync_kiocb+0x50/0x50 [ 1332.008003] [<c11543ff>] sys_ioctl+0x6f/0x80 [ 1332.008003] [<c15abb9f>] sysenter_do_call+0x12/0x28 ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xserver-xorg-video-intel 2:2.15.901-1ubuntu4 ProcVersionSignature: Ubuntu 3.2.0-4.10-generic-pae 3.2.0-rc5 Uname: Linux 3.2.0-4-generic-pae i686 ApportVersion: 1.90-0ubuntu1 Architecture: i386 CompizPlugins: [core,bailer,detection,composite,opengl,decor,imgpng,gnomecompat,regex,place,snap,vpswitch,mousepoll,grid,compiztoolbox,animation,move,session,resize,unitymtgrabhandles,workarounds,wall,expo,fade,ezoom,scale,unityshell] Date: Thu Dec 15 20:47:24 2011 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu GraphicsCard: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Fujitsu Limited. Device [10cf:1458] Subsystem: Fujitsu Limited. Device [10cf:1458] InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111121) MachineType: FUJITSU LifeBook T4410 PccardctlIdent: Socket 0: no product info available PccardctlStatus: Socket 0: no card ProcEnviron: PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-generic-pae root=UUID=74b73169-6ac4-4698-bb5e-1f9b21250507 ro quiet splash vt.handoff=7 SourcePackage: xserver-xorg-video-intel UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/30/2009 dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd. dmi.bios.version: Version 1.05 dmi.board.name: FJNB206 dmi.board.vendor: FUJITSU dmi.chassis.type: 10 dmi.chassis.vendor: A40R8CE708EA1001 dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.05:bd09/30/2009:svnFUJITSU:pnLifeBookT4410:pvr:rvnFUJITSU:rnFJNB206:rvr:cvnA40R8CE708EA1001:ct10:cvr: dmi.product.name: LifeBook T4410 dmi.sys.vendor: FUJITSU version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu8 version.libdrm2: libdrm2 2.4.27-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4 version.xserver-xorg-core: xserver-xorg-core 2:1.10.4-1ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1 ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete ** Affects: xserver-xorg-video-intel (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug i386 kernel-request-3.2.0-5.11 precise running-unity single-occurrence ubuntu -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/905109 Title: Kernel lockup/crash while using desktop switcher in unity To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/905109/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp