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

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Message-ID: <alpine.DEB.2.10.1402280914550.6727@vincent-weaver-1.um.maine.edu>
Date:	Fri, 28 Feb 2014 09:15:33 -0500 (EST)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	"H. Peter Anvin" <hpa@...or.com>,
	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 Thu, 27 Feb 2014, Steven Rostedt wrote:

> On Thu, 27 Feb 2014 20:34:34 -0500 (EST)
> Vince Weaver <vincent.weaver@...ne.edu> wrote:
> 
> 
> > > I would actually suggest we do the equivalent on i386 as well.
> > > 
> > > Vince, could you try this patch as an experiment?
> > 
> > OK with your patch applied it does not segfault.
> > 
> 
> Vince, Great! Can you remove Peter's patch, and try this one. It
> removes the crud to save the cr2 from entry_64.S and makes both i386
> and x86_64 do the same thing in regards to cr2 handling.

no, with only this patch applied it segfaults as per previous:

[  126.396049] perf_fuzzer[2904]: segfault at 17a0 ip 00000000004017fd sp 00000000ffaff3f0 error 6 in perf_fuzzer[400000+d1000]

Vince
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