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

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Public bug reported:

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 tasks).

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
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /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
RelatedPackageVersions:
 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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1585598

Title:
  steady decrease in available memory (RAM) under 16.04

Status in linux package in Ubuntu:
  New

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
  tasks).

  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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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
  RelatedPackageVersions:
   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

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