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[tim pierson <tim.pierson@xxxxxxxxx>]

I can confirm that I'm also experieancing this bug.  12.04, clean
install 16gb ram, 32 swap.  It can be replicated in python with:

import numpy as np
l=[]
for i in range(10000):
    l.append(np.array(np.ones(10000000), dtype=np.float64))


this can be done in console mode or GUI, the arrays are allocated, ram fills and swap begins, then the system freezes requiring a hard reboot.

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https://bugs.launchpad.net/bugs/1162073

Title:
  [NP900X4C-A04US] System freeze on high memory usage

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  When I use MATLAB and all 8GB of RAM are full, system freezes and only
  a hard restart can get it working. I have tested it with the newest
  kernel http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9-rc4-raring/
  and it still persists.

  Would need to increase swap space as outlined in
  http://www.mathworks.com/help/matlab/matlab_prog/resolving-out-of-
  memory-errors.html .

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-26-generic 3.5.0-26.42
  ProcVersionSignature: Ubuntu 3.5.0-26.42-generic 3.5.7.6
  Uname: Linux 3.5.0-26-generic x86_64
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ivan       2469 F.... pulseaudio
  Date: Sat Mar 30 00:49:49 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=4def1db0-01fa-4505-8eb6-97442bc58e4a
  InstallationDate: Installed on 2013-02-28 (29 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 900X3C/900X3D/900X4C/900X4D
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic root=UUID=4936fe74-689d-4768-951a-d793b24ad3cc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-26-generic N/A
   linux-backports-modules-3.5.0-26-generic  N/A
   linux-firmware                            1.95
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/08/2012
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P04AAC
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP04AAC:bd08/08/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn900X3C/900X3D/900X4C/900X4D:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 900X3C/900X3D/900X4C/900X4D
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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