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** 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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