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[Eric O'Connor <1460434@xxxxxxxxxxxxxxxxxx>]

I have this happen to me as well on Ubuntu 15.10.

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https://bugs.launchpad.net/bugs/1460434

Title:
  System Freeze On Low Memory

Status in linux package in Ubuntu:
  Expired

Bug description:
  System freeze occurs when memory is almost full and there is no chance
  to kill processes. Everything is unresponsive, hdd is trashing, even
  ssh connection does not show any reaction. I set vm.swappiness = 1 to
  minimize swapping but those lock ups are still there. I think this
  could be related to disk caching. Few times I observed in iotop that
  several processes use %90+ disk I/O while memory is close to its
  limit. I increased vm.min_free_kbytes (default value was 65536) but
  not tested yet. Current disk scheduler is set to deadline.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-18-generic 3.19.0-18.18
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  user       2571 F.... pulseaudio
  CurrentDesktop: LXDE
  Date: Sun May 31 16:29:04 2015
  InstallationDate: Installed on 2014-11-15 (197 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Packard Bell ENNS44HR
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=88ea410e-70cc-49a6-b2b3-326fc63a4e7d ro quiet splash elevator=deadline
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-18-generic N/A
   linux-backports-modules-3.19.0-18-generic  N/A
   linux-firmware                             1.143.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-05-04 (27 days ago)
  dmi.bios.date: 04/28/2011
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: V1.23
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: ENNS44HR
  dmi.board.vendor: Packard Bell
  dmi.board.version: V1.23
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Packard Bell
  dmi.chassis.version: V1.23
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV1.23:bd04/28/2011:svnPackardBell:pnENNS44HR:pvrV1.23:rvnPackardBell:rnENNS44HR:rvrV1.23:cvnPackardBell:ct9:cvrV1.23:
  dmi.product.name: ENNS44HR
  dmi.product.version: V1.23
  dmi.sys.vendor: Packard Bell

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