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[rsoika <1321240@xxxxxxxxxxxxxxxxxx>]

I think I have had the same problem. I was able to force the error with the tool 'memtester'. 
Finally I figured out that after I changed the Memory Frequency Limiter in BIOS form 'AUTO' to one of the lowest levels my system run stable.

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https://bugs.launchpad.net/bugs/1321240

Title:
  [Lenovo IdeaPad Y510P] System Freeze on High Memory usage

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I have 8GB of RAM memory and 8GB of swap space configured. When I'm
  filling up this memory, my computer freezes completely. I can't even
  switch properly to other TTYs (Ctrl+Alt+Fx).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  theone     1993 F.... pulseaudio
   /dev/snd/controlC0:  theone     1993 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue May 20 12:43:32 2014
  HibernationDevice: RESUME=UUID=d7f6cff7-effd-4645-9ab7-87143cf2fa73
  InstallationDate: Installed on 2014-04-18 (31 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20217
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=03c56253-58b1-4e42-9ef0-0378c67111b0 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 74CN44WW(V3.05)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: VIQY0Y1
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y510P
  dmi.modalias: dmi:bvnLENOVO:bvr74CN44WW(V3.05):bd09/18/2013:svnLENOVO:pn20217:pvrLenovoIdeaPadY510P:rvnLENOVO:rnVIQY0Y1:rvrNotDefined:cvnLENOVO:ct10:cvrLenovoIdeaPadY510P:
  dmi.product.name: 20217
  dmi.product.version: Lenovo IdeaPad Y510P
  dmi.sys.vendor: LENOVO

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