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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1331186

Title:
  Ubuntu Linux kernel memory leak, cache memory trouble

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  As soon as I start Ubuntu 12.04.4 LTS with i386 PAE kernel, 8GB memory, GNU/Linux 3.2.0-64-generic-pae i686,
  cache memory area  increases a little by a little, and It consumes 5GB memory. User memory left will become 200MB.

  I release cache memory by issuing a shell script, cache_release.sh. It
  is  like that :

  #!/bin/bash

  /bin/sync
  /bin/sync
  /bin/sync
  /bin/sync
  /bin/sync

  /sbin/sysctl -w vm.drop_caches=1
  /sbin/sysctl -w vm.drop_caches=2
  /sbin/sysctl -w vm.drop_caches=3

  I registered this shell script to crontab and I issue this script
  command once a hour.

  Maybe kernel requires patches.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-64-generic-pae 3.2.0-64.97
  ProcVersionSignature: Ubuntu 3.2.0-64.97-generic-pae 3.2.59
  Uname: Linux 3.2.0-64-generic-pae i686
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC665 Analog [ALC665 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  hiroshi    4448 F.... pulseaudio
   /dev/snd/controlC0:  hiroshi    4448 F.... pulseaudio
   /dev/snd/pcmC0D0p:   hiroshi    4448 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf0a00000 irq 57'
     Mixer name	: 'Realtek ALC665'
     Components	: 'HDA:10ec0665,1028046e,00100003'
     Controls      : 26
     Simple ctrls  : 13
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xcdefc000 irq 17'
     Mixer name	: 'Nvidia GPU 14 HDMI/DP'
     Components	: 'HDA:10de0014,10de0101,00100100'
     Controls      : 24
     Simple ctrls  : 4
  Date: Wed Jun 18 05:27:20 2014
  HibernationDevice: RESUME=UUID=02e8790f-b82d-416f-8a25-de64b1bac6e9
  InstallationMedia: Ubuntu 12.04 "Precise" - Build i386 LIVE Binary 20120501-03:27
  MachineType: Dell Inc. XPS L501X
  MarkForUpload: True
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-64-generic-pae root=UUID=1dff47dd-b881-4de7-b290-b74b48753d63 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-64-generic-pae N/A
   linux-backports-modules-3.2.0-64-generic-pae  N/A
   linux-firmware                                1.79.15
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/26/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A08
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A08
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd07/26/2011:svnDellInc.:pnXPSL501X:pvrA08:rvnDellInc.:rn:rvrA08:cvnDellInc.:ct8:cvrA08:
  dmi.product.name: XPS L501X
  dmi.product.version: A08
  dmi.sys.vendor: Dell Inc.

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