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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

To see if it is the cause of this issue, I built a test kernel with a
revert of commit 97b2591.  The test kernel can be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1499203/

Can you test this kernel and see if it resolves this bug?  If it does
not, we would have to perform a kernel bisect to identify the commit
that caused this regression.

Thanks in advance!

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https://bugs.launchpad.net/bugs/1499203

Title:
  memory leak in hv_storvsc (3.13.0-63-generic)

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Confirmed

Bug description:
  Slab and SUnreclaim values in /proc/meminfo keep increasing. On one
  servers it reached 85% of physical memory after 14 days - but on most
  other servers it increases more slowly. I checked /proc/slabinfo and
  almost all allocations were in kmalloc-512. So I enabled
  "slub_debug=U,kmalloc-512" on one server, and after only 24h of uptime
  11% of the memory was used by kmalloc-512 and unreclaimable. With
  debugging enabled I could see the following in
  /sys/kernel/slab/kmalloc-512/alloc_calls:

  521294 storvsc_queuecommand+0x359/0x790 [hv_storvsc]
  age=161922/955116/20882927 pid=1-41545

  All other counters were below 2000. In
  /sys/kernel/slab/kmalloc-512/free_calls I see the following:

  516823 <not-available> age=4315783846 pid=0

  The hv_storvsc module is for Hyper-V. We are (unfortunately) running
  Hyper-V 6.3.9600.16384 with Microsoft System Center 2012 R2 Update
  rollup 3 for all the servers with this issue.

  Kernels are stock linux-image-3.13.0-63-generic, 3.13.0-63.103,
  x86_64, from Ubuntu 14.04 LTS . /proc/version_signature contains:

    Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25

  No output from lspci -vnvn. The problem described above happens on
  both single and multicore virtual machines. CPU in hypervisors are
  E5-2630 v2 @ 2.60GHz. Let me know if you need more info or if I can do
  more debugging.

  Regards,

  Oskar Liljeblad
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 24 00:31 seq
   crw-rw---- 1 root audio 116, 33 Sep 24 00:31 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  CurrentDmesg:
   [59081.977909] systemd-udevd[26480]: starting version 204
   [59124.051974] init: systemd-logind main process (756) killed by TERM signal
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-09-09 (380 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  MachineType: Microsoft Corporation Virtual Machine
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 hyperv_fb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-63-generic.efi.signed root=UUID=f4d228d6-2eee-40fc-bf3f-633e46fa8301 ro slub_debug=U,kmalloc-512
  ProcVersionSignature: Ubuntu 3.13.0-63.103-generic 3.13.11-ckt25
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-63-generic N/A
   linux-backports-modules-3.13.0-63-generic  N/A
   linux-firmware                             1.127.15
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.13.0-63-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  WifiSyslog:
   Sep 24 02:06:19 adm-backup1 dhclient: message repeated 1447 times: [ DHCPREQUEST of 10.40.128.9 on eth0 to 192.0.2.253 port 67 (xid=0x429dad4)]
   Sep 24 02:06:37 adm-backup1 dhclient: DHCPREQUEST of 10.40.128.9 on eth0 to 255.255.255.255 port 67 (xid=0x429dad4)
   Sep 24 02:06:37 adm-backup1 dhclient: DHCPACK of 10.40.128.9 from 192.0.2.253
   Sep 24 02:06:37 adm-backup1 dhclient: bound to 10.40.128.9 -- renewal in 44877 seconds.
  _MarkForUpload: True
  dmi.bios.date: 11/26/2012
  dmi.bios.vendor: Microsoft Corporation
  dmi.bios.version: Hyper-V UEFI Release v1.0
  dmi.board.asset.tag: None
  dmi.board.name: Virtual Machine
  dmi.board.vendor: Microsoft Corporation
  dmi.board.version: Hyper-V UEFI Release v1.0
  dmi.chassis.asset.tag: 6126-4244-1659-0314-3158-3955-44
  dmi.chassis.type: 3
  dmi.chassis.vendor: Microsoft Corporation
  dmi.chassis.version: Hyper-V UEFI Release v1.0
  dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0:
  dmi.product.name: Virtual Machine
  dmi.product.version: Hyper-V UEFI Release v1.0
  dmi.sys.vendor: Microsoft Corporation

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