linux-kernel - Re: perf_fuzzer compiled for x32 causes reboot

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Date:	Tue, 25 Feb 2014 09:43:52 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: perf_fuzzer compiled for x32 causes reboot

On Tue, 25 Feb 2014 06:34:55 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> #2 is what I really don't understand.
> 
> I worry something else is going on there

Yeah, me too.

-- Steve

> 
> >
> >While the missing cr2 issue made debugging frustrating, I find the
> >other 
> >aspects of the bug more serious:
> >
> >  1.  Programs that are doing valid memory accesses can segfault
> >and worse
> >2.  This bug can cause an instant-reboot of the system (I assume
> >somehow
> >      with the right combination of memory accesses  it causes a 
> >      triple-fault?)
> >
> >#2 is why I spent all of this time tracking this down, I couldn't leave
> >a 
> >machine fuzzing overnight without the machine rebooting.
> >
> >Vince
> 

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