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

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Message-ID: <20110602143143.GI23047@sequoia.sous-sol.org>
Date:	Thu, 2 Jun 2011 07:31:43 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	CAI Qian <caiqian@...hat.com>
Cc:	Andrea Righi <andrea@...terlinux.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>, 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()

* 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.
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