Re: Size-128 slab leak

["Kevin O'Connor" <kevin@koconnor.net>]

On Wed, Feb 01, 2006 at 11:10:01PM -0800, Andrew Morton wrote:
> "Kevin O'Connor" <kevin@koconnor.net> wrote:
> >
> > I have an annoying slab leak on my kernel.  Every day, I lose about
> >  50Megs of memory to the leak.  It seems to be related to disk
> >  accesses, because the count only goes up noticeable around 4:00am when
> >  the system locate utility runs.
> > 
> >  I can tell there is a leak because /proc/slabinfo shows "size-128"
> >  growing continuously.  For example, it currently reads:
>
> -mm kernels have a patch (slab-leak-detector.patch) which will help. 
> Here's a version for 2.6.16-rc1.  It requires CONFIG_DEBUG_SLAB.  Thanks.

Thanks Andrew.

I've applied the patch and found the leak.  It's in kzalloc.  :-)

With kzalloc inlined, however, it appears that selinux is the likely
culprit.  I would not have expected that.

After running updatedb I got 23530 occurrences of:

kernel: obj ffff81003f04f000/12: ffffffff801ed7b7 <selinux_inode_alloc_security+0x37/0x100>

I'm not sure how to debug selinux issues, but at least I can disable
it.

-Kevin