linux-kernel - Re: perf_fuzzer crash on pentium 4

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Date:	Wed, 28 May 2014 17:20:11 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Pavel Machek <pavel@....cz>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: perf_fuzzer crash on pentium 4

On Wed, May 28, 2014 at 06:06:32PM +0400, Cyrill Gorcunov wrote:
> On Wed, May 28, 2014 at 03:56:17PM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > So just to be difficult I fired up the perf_fuzzer on a Pentium 4 machine.
> > > 
> > > It crashes more or less instantly (sorry for the line wrapping, 
> > > just got the serial console hooked up and don't have minicom configured 
> > > right yet).
> > > 
> > > this is 3.15-rc4 with the anti-memory corruption patch applied.
> > > 
> > > [   67.872274] BUG: unable to handle kernel NULL pointer dereference at 00000004
> > > [   67.876146] IP: [<ffffffff81013df2>] p4_pmu_schedule_events+0xa5/0x331
> > 
> > Pentium 4 's were not 64bit, were they?
> 
> Not all, but there were 64bit varians (Xeons iirc).

http://en.wikipedia.org/wiki/Pentium_d

consumer netburst chip with x86_64.

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