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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Summary changed:

- system swapping itself to death in raring for no good reason
+ [Lenovo ThinkPad X201 3249] system swapping itself to death in raring for no good reason

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https://bugs.launchpad.net/bugs/1152736

Title:
  [Lenovo ThinkPad X201 3249] system swapping itself to death in raring
  for no good reason

Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Raring:
  Confirmed
Status in “linux” source package in Saucy:
  Confirmed

Bug description:
  My laptop has 4GB of RAM and ~6GB of swap configured.  After my most
  recent kernel upgrade in raring, I am noticing the system has started
  swapping itself to death; the desktop becomes completely unresponsive,
  and in some cases it becomes unresponsive even over SSH.

  Looking remotely with SSH, I find that kswapd0 is using up nearly one
  full core.  I have no idea *why* - I have vm.swappiness set to 30, and
  'free' shows that over 1GB of RAM is still being used for buffers, so
  there really shouldn't be any memory pressure.  Despite the fact that
  there's only ~400MB of swap used, which should certainly fit back into
  system memory, 'swapoff -a' fails with a 'Could not allocate memory'
  error.  If I set vm.swappiness to 0, the swap usage decreases, but
  *very* slowly: after over a half hour, there's still over 400MB of
  swap used.  And I don't have any idea what kswapd is doing at this
  point, but it's still very busy; and even after setting
  vm.swappiness=0, the system has managed a second time to get itself
  into an unresponsive state, with swap looking like the culprit.

  dmesg shows nothing (which I will try to demonstrate by attaching logs from the machine in question, once it's responsive enough to let me run apport-collect).
  --- 
  ApportVersion: 2.9-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vorlon    29618 F.... pulseaudio
   /dev/snd/controlC0:  vorlon    29618 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=f6ab3c43-61b4-4af7-bf03-fa3b147a1de0
  InstallationDate: Installed on 2010-09-24 (896 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 3249CTO
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-10-generic root=/dev/mapper/hostname-root ro quiet splash --verbose vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-10.19-generic 3.8.2
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-10-generic N/A
   linux-backports-modules-3.8.0-10-generic  N/A
   linux-firmware                            1.103
  Tags:  quantal
  Uname: Linux 3.8.0-10-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2013-01-25 (42 days ago)
  UserGroups: adm admin cdrom dialout libvirtd lpadmin mythtv plugdev sambashare src sudo
  WifiSyslog:
   
  dmi.bios.date: 08/23/2010
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET52WW (1.22 )
  dmi.board.name: 3249CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr6QET52WW(1.22):bd08/23/2010:svnLENOVO:pn3249CTO:pvrThinkPadX201:rvnLENOVO:rn3249CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3249CTO
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO

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