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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1499203

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

** Tags added: trusty

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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:
  Incomplete

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

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