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[Launchpad Bug Tracker <1510821@xxxxxxxxxxxxxxxxxx>]

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I am dev and I know how this sounds but at a certain periods ubuntu
freezes entirely. The only exit is the power button. I dont know what
could be helpful information in this case so I will write everything I
noticed so far (sry for the spam).

This used to happen a lot while building with Android Studio but lately
it freezes even when the studio is closed. The last time it happened
after I closed(or tried to) Chrome tab while updating ubuntu. This
behavior started a few weeks ago. I haven't updated to 15.10 at the time
so I did. But it still continued to block. I thought it might be from
the video driver so I switched from nvidia-340 to nouveau with no
success.

I cant find anything helpful in kern.log if its needed I can attach the
log just before the freeze. What I find strange is in the syslog. At the
time of the freeze it is filled with NULs. See attached image
syslog.png. The time of the freeze was around 8:57. At this point the
mouse cursor was active but there was nothing that reacted to my
desperate clicks or keyboard shortcuts. After awhile the mouse stops as
well and there is nothing I can do but the power button.

Is there some other log that could be helpful or anything else I can do?


Thank you in advance

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Wed Oct 28 09:36:12 2015
DistUpgraded: 2015-10-27 13:34:15,610 DEBUG enabling apt cron job
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
 vboxhost, 5.0.2, 3.19.0-31-generic, x86_64: installed
 vboxhost, 5.0.2, 4.2.0-16-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation G92 [GeForce GTS 250] [10de:0615] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:82e6]
InstallationDate: Installed on 2015-06-17 (132 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: System manufacturer System Product Name
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=db78bb87-80bc-4175-935a-18f69d5c471d ro quiet splash vt.handoff=7
SourcePackage: xorg
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2015-10-27 (0 days ago)
dmi.bios.date: 05/13/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0401
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A78-AM
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0401:bd05/13/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A78-AM:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Wed Oct 28 10:00:45 2015
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input         USB OPTICAL MOUSE   MOUSE, id 8
 input        AT Translated Set 2 keyboard KEYBOARD, id 9
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
 NOUVEAU(0): [COPY] failed to allocate class.
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.17.2-1ubuntu9
xserver.video_driver: nouveau

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug latest-bios-2202 ubuntu wily
-- 
Ubuntu Freezes With No Obvious Reason
https://bugs.launchpad.net/bugs/1510821
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