Re: 4.3-rc7: kmemleak BUG: Redzone overwritten

[Aaro Koskinen]

Hi,

On Tue, Oct 27, 2015 at 05:56:11PM +0200, Andy Shevchenko wrote:
> On Tue, 2015-10-27 at 17:46 +0200, Aaro Koskinen wrote:
> > With 4.3-rc7 and slub_debug=FZUP, I get the below when reading
> > /sys/kernel/debug/kmemleak with a large number of reported entries.
> > It's pretty repeatable. HW is MIPS64.
> > 
> > With the SLUB debugging disabled, box crashes randomly in
> > kmem_cache_free
> > or kmem_cache_alloc when the kmemleak file is read on a running
> > system.
> > 
> > Seems to start with 6fc37c490076 ("kmemleak: use seq_hex_dump() to
> > dump buffers").
> 
> So, you mean reverting it does help?

Yes.

> Btw, we have kmemleak test suite. Any suggestion how can it be
> reproducible with it?

Maybe a add test for big number of objects? In this case there are 3072
reported objects.

A.
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