On Jul 17, 2012, at 19:22 , Orion Poplawski wrote:

> Our SL6.2 KVM and nfs/backup server has been crashing frequently recently (starting around Fri 13th - yikes!) with Kernel panic - Out of memory and no killable processes.  The server has 48GB ram, 2GB swap, only about 15GB dedicated to VM guests.  I've tried bumping up vm.min_free_kbytes to 262144 to no avail.  Nothing strange is getting written to the logs before the crash.
> 
> Happening with both 2.6.32-220.23.1 and 2.6.32-279.1.1.
> 
> Anyone else seeing this?

Not on our KVM servers (which don't have any other duties though), which have been running -220.23.1 for three weeks.

>  Any other ideas?

Is swap space sufficient?

Have you modified vm.overcommit_* ? Doing so may help turning the panics into allocation failures that can be handled.

Do any slab pools keep growing, to an unusual size?

-- 
Stephan Wiesand
DESY -DV-
Platanenenallee 6
15738 Zeuthen, Germany