linux-kernel - Re: 4.3-rc7: kmemleak BUG: Redzone overwritten

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Message-ID: <20151027160650.GW1284@ak-desktop.emea.nsn-net.net>
Date:	Tue, 27 Oct 2015 18:06:50 +0200
From:	Aaro Koskinen <aaro.koskinen@...ia.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 4.3-rc7: kmemleak BUG: Redzone overwritten

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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