linux-kernel - Re: [BUG 3.0.0-rc1] ksm: NULL pointer dereference in ksm_do

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Message-ID: <20110602143622.GE19505@random.random>
Date:	Thu, 2 Jun 2011 16:36:22 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	CAI Qian <caiqian@...hat.com>,
	Andrea Righi <andrea@...terlinux.com>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Izik Eidus <ieidus@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUG 3.0.0-rc1] ksm: NULL pointer dereference in ksm_do_scan()

On Thu, Jun 02, 2011 at 07:31:43AM -0700, Chris Wright wrote:
> * CAI Qian (caiqian@...hat.com) wrote:
> > madvise(0x2210000, 4096, 0xc /* MADV_??? */) = 0
> > --- SIGSEGV (Segmentation fault) @ 0 (0) ---
> 
> Right, that's just what the program is trying to do, segfault.
> 
> > +++ killed by SIGSEGV (core dumped) +++
> > Segmentation fault (core dumped)
> > 
> > Did I miss anything?
> 
> I found it works but not 100% of the time.
> 
> So I just run the bug in a loop.

echo 0 >scan_millisecs helps.
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