← Back to team overview

kernel-packages team mailing list archive

[Bug 1585598] Re: steady decrease in available memory (RAM) under 16.04


Christopher Barrington-Leigh, thank you for reporting this and helping
make Ubuntu better.

In order to allow additional upstream developers to examine the issue, at your earliest convenience, could you please test the latest upstream kernel available from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ? Please keep in mind the following:
1) The one to test is at the very top line at the top of the page (not the daily folder).
2) The release names are irrelevant.
3) The folder time stamps aren't indicative of when the kernel actually was released upstream.
4) Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds .

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:

Where X, and Y are the first two numbers of the kernel version, and Z is
the release candidate number if it exists.

If the mainline kernel does not fix the issue, please add the following tags:

Please note, an error to install the kernel does not fit the criteria of

Also, you don't need to apport-collect further unless specifically
requested to do so.

Once testing of the latest upstream kernel is complete, please mark this
report Status Confirmed. Please let us know your results.

Thank you for your understanding.

** Tags added: bios-outdated-1.22 regression-release

** Changed in: linux (Ubuntu)
   Importance: Critical => High

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

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  steady decrease in available memory (RAM) under 16.04

Status in linux package in Ubuntu:

Bug description:
  I've just upgraded to 16.04 from 15.10, and now the memory usage
  steadily increases from when I first boot up. After just an hour or
  two, all 20GB of RAM is used up, even if nothing is running, and I am
  forced to reboot (rebooting frequently is incompatible with my normal

  Here is output from free, spaced about half a second apart:

  [0753][me@-t450s:~]$ free  -m
                total        used        free      shared  buff/cache   available
  Mem:          19958        1001        5808        7147       13148       11648
  Swap:         20358           0       20358
  [0753][me@-t450s:~]$ free  -m
                total        used        free      shared  buff/cache   available
  Mem:          19958        1001        5806        7148       13151       11647
  Swap:         20358           0       20358
  [0753][me@-t450s:~]$ free  -m
                total        used        free      shared  buff/cache   available
  Mem:          19958        1001        5804        7149       13153       11646
  Swap:         20358           0       20358
  [0753][me@-t450s:~]$ free  -m
                total        used        free      shared  buff/cache   available
  Mem:          19958        1001        5801        7151       13156       11644
  Swap:         20358           0       20358

  htop shows that 8GB is in use, although there are no applications
  using much.  I understand from free that it is all buffered/cached?

  Both htop and free suggest that the memory is really not available. 
  I do not know where it is going.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC2:  cpbl       2571 F.... pulseaudio
   /dev/snd/controlC1:  cpbl       2571 F.... pulseaudio
   /dev/snd/controlC0:  cpbl       2571 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed May 25 07:54:14 2016
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=e5d0a2bb-27cf-494a-849c-1985d165fbd7
  InstallationDate: Installed on 2016-02-12 (102 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: LENOVO 20BXCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=ea2fb511-8d62-4b96-bdaa-4b3f7bf79cc6 ro noprompt quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-05-24 (0 days ago)
  dmi.bios.date: 11/06/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET54WW (1.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET54WW(1.19):bd11/06/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

To manage notifications about this bug go to: