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[Bug 1235161] Re: lowmemorykiller killing processes when swap still available


** Changed in: linux (Ubuntu Saucy)
       Status: In Progress => Fix Committed

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  lowmemorykiller killing processes when swap still available

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Saucy:
  Fix Committed

Bug description:
  Hi there,

  I've upgraded a number of test systems to the latest Saucy beta. I've
  seen quite a few cases of processes being killed by lowmemorykiller
  with the following entries being logged:

  [ 291.565121] lowmemorykiller: send sigkill to 4476 (python), adj 0, size 8864
  [23515.006794] lowmemorykiller: send sigkill to 944 (update-apt-xapi), adj 0, size 44175

  The systems where this happens are kvm virtual machines with
  relatively modest amounts of RAM allocated (256 or 512 MB) with 2 GB
  swap. The swap is mostly unused when the kills occur.

  I searched around and could only find references to Android for
  lowmemorykiller and nothing on how to disable it. I tried the
  following without success:

  echo '9999,9999' > /sys/module/lowmemorykiller/parameters/adj

  Any ideas on how to disable lowmemorykiller or at least prevent
  processes to be killed rather than swapped?

   total 0
   crw-rw---- 1 root audio 116,  1 Oct  3 18:30 seq
   crw-rw---- 1 root audio 116, 33 Oct  3 18:30 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=9d9d5ee8-6637-494c-a445-175def866e68
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Bochs Bochs
  MarkForUpload: True
  Package: linux (not installed)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-11-generic root=UUID=a693cab7-d536-4f4c-8f9e-02d84b2ad614 ro nosplash noplymouth console=tty0 console=ttyS0,115200n8
  ProcVersionSignature: Ubuntu 3.11.0-11.17-generic 3.11.3
   linux-restricted-modules-3.11.0-11-generic N/A
   linux-backports-modules-3.11.0-11-generic  N/A
   linux-firmware                             1.116
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  saucy
  Uname: Linux 3.11.0-11-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
   Oct  4 07:10:46 vm2 kernel: [45649.533724] perf samples too long (2568 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
   Oct  4 14:18:47 vm2 kernel: [71330.618497] perf samples too long (5018 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
  dmi.bios.date: 01/01/2011
  dmi.bios.vendor: Bochs
  dmi.bios.version: Bochs
  dmi.chassis.type: 1
  dmi.chassis.vendor: Bochs
  dmi.modalias: dmi:bvnBochs:bvrBochs:bd01/01/2011:svnBochs:pnBochs:pvr:cvnBochs:ct1:cvr:
  dmi.product.name: Bochs
  dmi.sys.vendor: Bochs

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