Public bug reported:
I observed a memory leak after a resume from hibernate with RT kernel:
/proc/slabinfo shows a growing count of mm_struct which causes the system to
run out of memory after a day or more (Free LowMem decreases).
Sequence to reproduce the issue (on a new installation of Ubuntu Lucid with the
RT kernel and the uswsusp package installed):
- monitor the mm_struct count using the command "watch -d -n 1 "cat
/proc/slabinfo | grep mm_struct" -> stable
- hibernate the system using the command "sudo s2disk" (the issue also occurs
when using s2ram)
- resume from hibernate
- monitor the mm_struct count using the command "watch -d -n 1 "cat
/proc/slabinfo | grep mm_struct" -> growing
I did not reproduce this issue with the Lucid 2.6.32.33.39 generic
kernel. I have also built (with the same config) the 2.6.31 kernel taken
from kernel.org patched with the corresponding RT patch of Ingo Molnar:
and following the same sequence I did not observe the issue. So it seems
that this issue only occurs on the ubuntu kernel stream.
Description: Ubuntu 10.04 LTS
Release: 10.04
linux-image-2.6.31-11-rt:
Installed: 2.6.31-11.154
Candidate: 2.6.31-11.154
Version table:
*** 2.6.31-11.154 0
500 http://archive.ubuntu.com/ubuntu/ lucid-updates/universe Packages
100 /var/lib/dpkg/status
uswsusp:
Installed: 0.8-1.1ubuntu3
Candidate: 0.8-1.1ubuntu3
Version table:
*** 0.8-1.1ubuntu3 0
500 http://archive.ubuntu.com/ubuntu/ lucid/universe Packages
100 /var/lib/dpkg/status
** Affects: linux-rt (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/856230
Title:
Memory leak after resume from hibernate with RT kernel
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