Date: Thu, 2 Jun 2011 07:31:43 -0700
From: Chris Wright <chrisw@sous-sol.org>
To: CAI Qian <caiqian@redhat.com>
Cc: Andrea Righi <andrea@betterlinux.com>, Hugh Dickins <hughd@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>, Rik van Riel <riel@redhat.com>,
        Chris Wright <chrisw@sous-sol.org>, Mel Gorman <mel@csn.ul.ie>,
        Izik Eidus <ieidus@redhat.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [BUG 3.0.0-rc1] ksm: NULL pointer dereference in ksm_do_scan()
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* CAI Qian (caiqian@redhat.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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