Public bug reported:

This is the second time (unclear about a third one) I encounter this
crash and all I could do was power-cycling to reboot.

/var/crash is empty

/var/log/syslog and /var/log/kern.log don't contain any hint around the
crash time (the subsequent reboot is present though).

So I took a picture (attached) :-}

The last time this bug occurred, I was destroying a juju env with 13
lxcs instances but I've since done it again without reproducing the
issue (and I do it on a ~regular basis without triggering the bug).

Hopefully the traceback can provide some hints ?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-30-generic 3.13.0-30.54
ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  vila      13341 F.... pulseaudio
 /dev/snd/controlC1:  vila      13341 F.... pulseaudio
 /dev/snd/controlC3:  vila      13341 F.... pulseaudio
 /dev/snd/controlC0:  vila      13341 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Jul  2 18:37:20 2014
InstallationDate: Installed on 2011-06-23 (1105 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64+mac (20110427.1)
MachineType: System manufacturer System Product Name
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-30-generic 
root=UUID=9e03ea1c-298d-4b96-9870-4db1fe183774 ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-30-generic N/A
 linux-backports-modules-3.13.0-30-generic  N/A
 linux-firmware                             1.127.4
RfKill:
 0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-04-08 (85 days ago)
dmi.bios.date: 09/21/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2209
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P6T DELUXE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2209:bd09/21/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TDELUXE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

** Attachment added: "traceback"
   
https://bugs.launchpad.net/bugs/1336859/+attachment/4143947/+files/image20140702_0002.jpg

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https://bugs.launchpad.net/bugs/1336859

Title:
  crash without any trace in log files

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