linux-kernel - Re: [RFC][PATCH 0/3] variuos perf fixes

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Message-ID: <20150914065748.GL18489@twins.programming.kicks-ass.net>
Date:	Mon, 14 Sep 2015 08:57:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vincent.weaver@...ne.edu>
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, acme@...nel.org,
	eranian@...gle.com, jolsa@...hat.com,
	alexander.shishkin@...ux.intel.com
Subject: Re: [RFC][PATCH 0/3] variuos perf fixes

On Sun, Sep 13, 2015 at 07:10:56PM -0400, Vince Weaver wrote:
> On Thu, 10 Sep 2015, Peter Zijlstra wrote:
> 
> > Vince reported some fail here:
> > 
> >   lkml.kernel.org/r/alpine.DEB.2.20.1509021227380.32729@...cent-weaver-1.umelst.maine.edu
> > 
> > These patches are the result of me trying to fix it.
> > 
> > Compile tested only, I'll try them after a sleep..
> 
> Sorry for the delay testing, your e-mails continue being sent to SPAM by 
> gmail for some reason.
> 
> I patched up a 4.3-rc1 system with the patches, and pretty much my 
> *entire* perf_event test suite causes kernel oopses.
> 
> This is on an AMD a10 system.
> 
> [ 1564.442224] BUG: unable to handle kernel NULL pointer dereference at 00000000000001e8

Yeah, I really should just not set out patches when I'm that tired.

What's worse, I already fixed this splat once, but forgot to copy it
over to the right machine etc..

Total fail.
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