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

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Message-ID: <alpine.DEB.2.10.1402281829330.7966@vincent-weaver-1.um.maine.edu>
Date:	Fri, 28 Feb 2014 18:34:00 -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 Fri, 28 Feb 2014, Steven Rostedt wrote:

> On Fri, 28 Feb 2014 16:18:23 -0500 (EST)
> Vince Weaver <vincent.weaver@...ne.edu> wrote:
> 
> > I was away from the computer this afternoon and of course I have scores of 
> > e-mails on this topic now with lots of competing patches.  Is there one 
> > in particular I'm supposed to be testing?
> 
> I was poking fun at you on IRC for this exact reason:
> 
> <rostedt> poor Vince, I keep sending him new patches. "No, don't test this patch, now test this one. Oh wait, try this one instead"
> * peterz sees Vince thinking: "stop... sending.. me.. damn... patches... already... !!!11!"
> <rostedt> or at least, "Let me finish this test before I cancel it again for another damn patch"
> <rostedt> then he's probably doing "I'm not going to run any tests now, until I wait a while to see if there's a new patch to test"

Well while it might appear that I spend all of my days finding perf_event 
bugs, I actually am a college professor so I do occasionally have to run 
off to teach a class, meet with students, or write papers/grants for other 
academics to reject.

It's nice others can reproduce the issue now, it would have saved me a lot 
of trouble, although now in theory I have a much better handle of how to 
use/abuse ftrace so I guess it was worth it.

Once the fix gets into git I'm sure the relentless perf_fuzzer will let us 
know if there are any other issues left.  I do look forward to the day 
when I can leave it running overnight and have a clean syslog the next 
morning.

Vince
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