linux-kernel - Re: mm: BUG: Bad rss-counter state

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Message-ID: <52E088FC.2050407@oracle.com>
Date:	Wed, 22 Jan 2014 22:14:04 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Dave Jones <davej@...hat.com>,
	David Rientjes <rientjes@...gle.com>, khlebnikov@...nvz.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mm: BUG: Bad rss-counter state

On 01/22/2014 09:21 PM, Dave Jones wrote:
> On Wed, Jan 22, 2014 at 09:16:03PM -0500, Sasha Levin wrote:
>   > On 01/22/2014 08:52 PM, Dave Jones wrote:
>   > > Sasha, is this the current git tree version of Trinity ?
>   > > (I'm wondering if yesterdays munmap changes might be tickling this bug).
>   >
>   > Ah yes, my tree has the munmap patch from yesterday, which would explain why we
>   > started seeing this issue just now.
>
> So that change is basically allowing trinity to munmap just part of a prior mmap.
> So it may do things like..
>
> mmap   |--------------|
>
> munmap |----XXX-------|
>
> munmap |------XXX-----|
>
> ie, it might try unmapping some pages more than once, and may even overlap prior munmaps.
>
> until yesterdays change, it would only munmap the entire mmap.
>
> There's no easy way to tell exactly what happened without a trinity log of course.

I've attached the trinity log of the child that triggered the bug. Odd thing is that I
don't see any munmaps in it.


Thanks,
Sasha


View attachment "trinity-child234.log" of type "text/x-log" (26994 bytes)