[Xen-users] dom0 - oom-killer - memory leak somewhere ?

[Adrien Urban <adrien.urban@xxxxxxxxxxxxxx>]

Hello,

I work in a hosting company, we have tens of Xen dom0 running just fine, 
but unfortunately we do have a few that get out of control.
Reported behaviour :
- dom0 uses more and more memory
- no process can be found using that memory
- at some point, oom killer kicks in, and kills everything, until even 
ssh the box becomes hard
- when there is really no more process to kill, it crashes even more, 
and we are forced to reboot
Configuration summary :
- dom0 with debian/stable, xen 4.0.1
- 512MB, or up to 2GB after some crash


I have tryed to find something that differs between a working dom0 and a 
buggy one, but didn't manage to find anything. Install from the same 
template, same packages, same hardware (but serials and mac addresses).

I didn't manage to find anything about leak in dom0 ending up with oom 
killer without doubt.
I tried to gather as much log as i thought could be helpful in attachments.
Host bk - about to get a reboot, as xend already got killed
Host sw - 800MB/2GB used for nothing,

Attachments contains :

- memory graph (by munin) - it might help to see the pattern of memory usage

cat from :
- grub.cfg
- /proc/meminfo
- /proc/slabinfo
- /proc/vmstat
- /var/log/kern.log
- /var/log/xen/xend.log

Result from :
- dmesg
- dpkg -l
- free
- lsmod
- top
- vmstat
- xm info
- xm info -c


I'd appreciate any feedback about such behaviour, and would be happy to 
provide additional information.
Those are productions servers, the only thing i'd really like to avoid 
as much as possible is rebooting them for tests.

Regards,

--
Adrien URBAN

Attachment: bk.tar.bz2
Description: Binary data

Attachment: sw.tar.bz2
Description: Binary data

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