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[Markus Wagner <1401817@xxxxxxxxxxxxxxxxxx>]

** Attachment added: "munin cpu"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1401817/+attachment/4279329/+files/cpu.png

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https://bugs.launchpad.net/bugs/1401817

Title:
  memory leak with unknown reason after upgrade to utopic

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm not sure if this is the right component/package. We are not able
  to identify a package/program which could be responsible for this bug,
  so we assume it is the kernel or at least a kernel configuration.

  Since the upgrade from trusty to utopic at October 27., our three
  servers for package building are massively swapping. This leads to by
  a factor of four slower build times. There were no configuration
  changes at all.

  Munin graphs of one of the affected servers are attached.

  The system has 48GB memory, and we have configured several ramdisks:

  root@cx1000-02:~# mount | grep -E "tmpfs|ramfs"
  none on /sys/fs/cgroup type tmpfs (rw,uid=0,gid=0,mode=0755,size=1024)
  udev on /dev type devtmpfs (rw,mode=0755)
  tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
  none on /run/lock type tmpfs (rw,nodev,noexec,nosuid,size=5242880)
  none on /run/shm type tmpfs (rw,nosuid,nodev)
  none on /run/user type tmpfs (rw,nodev,noexec,nosuid,size=104857600,mode=0755)
  tmpfs on /var/tmp/obs type tmpfs (rw,size=36G)
  tmpfs on /run/obs type tmpfs (rw,relatime,size=1G)
  ramfs on /var/obscache type ramfs (rw)
  tmpfs on /run/obs type tmpfs (rw,relatime,size=1048576k)

  The build service uses several chroot environments to build packages
  for several distributions (http://openbuildservice.org/).

  You don't see any process which allocates so much memory with 'top'.
  Even after stopping the build service and unmounting /var/tmp/obs you
  are not able to deactivate the swap via swapoff -a:

  root@cx1000-02:~# swapoff -a
  swapoff: /dev/sda5: swapoff failed: Cannot allocate memory

  We also tested the latest kernel (3.16.0-28) and an old trusty kernel
  (3.13.0-40) without success. Also patching perl to exclude the perl
  bug https://rt.perl.org/Public/Bug/Display.html?id=123198 as root
  cause doesn't help.

  We don't have any idea what's the cause for this problem...

  We can deploy debug packages or anything else on the system, so please
  hesitate to ask for any information or help.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-26-generic 3.16.0-26.35
  ProcVersionSignature: Ubuntu 3.16.0-26.35-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-26-generic x86_64
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  Date: Fri Dec 12 09:54:36 2014
  HibernationDevice: RESUME=UUID=531cb8f2-e194-45a7-a13c-3167aacf89bf
  InstallationDate: Installed on 2011-09-20 (1178 days ago)
  InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64 (20110426)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: FUJITSU PRIMERGY CX122 S1
  PciMultimedia:
   
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-26-generic root=UUID=6e5b9bee-ccdf-4e6f-b09d-759312aeb3e0 ro quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-26-generic N/A
   linux-backports-modules-3.16.0-26-generic  N/A
   linux-firmware                             1.138
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-10-27 (45 days ago)
  dmi.bios.date: 05/24/2011
  dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
  dmi.bios.version: 6.00 Rev. 1.10.2899.A1
  dmi.board.asset.tag: -
  dmi.board.name: D2899
  dmi.board.vendor: FUJITSU
  dmi.board.version: S26361-D2899-A11 WGS02 GS01
  dmi.chassis.asset.tag: YLAM001377
  dmi.chassis.type: 23
  dmi.chassis.vendor: FUJITSU
  dmi.chassis.version: CX122S1R
  dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvr6.00Rev.1.10.2899.A1:bd05/24/2011:svnFUJITSU:pnPRIMERGYCX122S1:pvrGS01:rvnFUJITSU:rnD2899:rvrS26361-D2899-A11WGS02GS01:cvnFUJITSU:ct23:cvrCX122S1R:
  dmi.product.name: PRIMERGY CX122 S1
  dmi.product.version: GS01
  dmi.sys.vendor: FUJITSU

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