Date: Fri, 3 Jun 2011 00:44:24 -0400 (EDT)
From: CAI Qian <caiqian@redhat.com>
To: Chris Wright <chrisw@sous-sol.org>
Cc: Andrea Righi <andrea@betterlinux.com>, Hugh Dickins <hughd@google.com>,
        Andrea Arcangeli <aarcange@redhat.com>, Rik van Riel <riel@redhat.com>,
        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>
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In-Reply-To: <20110602143143.GI23047@sequoia.sous-sol.org>
Subject: Re: [BUG 3.0.0-rc1] ksm: NULL pointer dereference in ksm_do_scan()
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----- Original Message -----
> * 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.
Still no luck here.
# while :; do ./test ; done
Segmentation fault (core dumped)
Segmentation fault (core dumped)
Segmentation fault (core dumped)
Segmentation fault (core dumped)
...

I can't really see what different with the hardware
here. It is only a NUMA server system.
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