Ubuntu 10.10 x86_64 2.6.35-28 - possible memory leak - slabs slowly eating memory

I have Ubuntu 10.10 x86_64 2.6.35-28 installed on two mirror machines. Kernel processes are slowly consuming whole available memory over time. Tooks around 10 days to eat up 4GB which leads to obvious total crash.

On the pastie below, you can check how does the slab info looks like around 24 hours prior to coming crash.

http://pastie.org/private/lmx2xhijugfi8zkic4cpsa

Its always kmalloc-192 and kmalloc-32 which are leaking the memory with the mutual proportion 6:1 (192:32). I am not really sure where to go from that point. Is there any other possible way to diagnose to cause a bit deeper?

I found out some posts from people with quite similiar issue on pretty much same hardware. The proposed solution was to disable acpi and apm, but it doesn't solved the issue on my boxes.

Any ideas much appreciated.

Hardware is from HP (DL360G5).

The most odd thing is, that slub_debug fixes the problem. There is no leak with debug enabled. I tried few times back and forth. Looks like the corelation is consistent!