linux-kernel - Re: [PATCH 6/7] mm: add CONFIG_DEBUG_VM

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Message-ID: <505D668C.7010206@suse.cz>
Date:	Sat, 22 Sep 2012 09:19:40 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Michel Lespinasse <walken@...gle.com>,
	Sasha Levin <levinsasha928@...il.com>, linux-mm@...ck.org,
	riel@...hat.com, peterz@...radead.org, aarcange@...hat.com,
	daniel.santos@...ox.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Dave Jones <davej@...hat.com>
Subject: Re: [PATCH 6/7] mm: add CONFIG_DEBUG_VM_RB build option

On 09/16/2012 09:07 PM, Hugh Dickins wrote:
>> What was the way that
>> Hugh used to reproduce the other issue?
> 
> I've lost track of which issue is "other".

The other was meant to be the BUG I hit.

> To reproduce Sasha's interval_tree.c warnings, all I had to do was switch
> on CONFIG_DEBUG_VM_RB (I regret not having done so before) and boot up.
> 
> I didn't look to see what was doing the mremap which caused the warning
> until now: surprisingly, it's microcode_ctl.  I've not made much effort
> to get the right set of sources and work out why that would be using
> mremap (a realloc inside a library?).
> 
> I failed to reproduce your BUG in huge_memory.c, but what I was trying
> was SuSE update via yast2, on several machines; but perhaps because
> they were all fairly close to up-to-date, I didn't hit a problem.
> (That was before I turned on DEBUG_VM_RB for Sasha's.)

The good news are that I cannot reproduce either with the patch applied.

thanks,
-- 
js
suse labs
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