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[Bug 1507338] Re: System freeze with long strings of NUL characters (^@) in the logs


I've just updated the bios:

N10ET38W (1.17 )

I don't know if I will be able to reproduce the bug again. It happened
suddenly while using some lightweight software (specifically Anki
http://ankisrs.net/). As described above I could only move the cursor
with the physical usb mouse, clicking, the touchpad and the keyboard
were unresponsive. After turning off and on the machine and looking at
the logs I foun that stange sequences of NUL characters.

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  System freeze with long strings of NUL characters (^@) in the logs

Status in linux package in Ubuntu:

Bug description:
  Experienced a system freeze. It was not possible to use the keyboard
  or the touchpad, it was possible to move the cursor using an USB mouse
  attached, but clicking had no effect. The strange thing is that at the
  time of the freeze /var/log/syslog and /var/log/kern.log displayed
  long strings of NUL bytes (^@).

  ApportVersion: 2.19.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC1:  brtdra     1818 F.... pulseaudio
   /dev/snd/controlC0:  brtdra     1818 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=7c657863-dc0e-432f-9b9d-9bc4395cdf1c
  InstallationDate: Installed on 2015-08-22 (57 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20CMCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic.efi.signed root=UUID=da47e804-2239-47b1-a6d1-493ccca12588 ro noprompt persistent quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
  Tags:  wily
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 4.2.0-16-generic x86_64
  UpgradeStatus: Upgraded to wily on 2015-10-16 (2 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/19/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N10ET36W (1.15 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CMCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0K11826 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN10ET36W(1.15):bd06/19/2015:svnLENOVO:pn20CMCTO1WW:pvrThinkPadX250:rvnLENOVO:rn20CMCTO1WW:rvrSDK0K11826WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20CMCTO1WW
  dmi.product.version: ThinkPad X250
  dmi.sys.vendor: LENOVO

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