linux-kernel - Re: [PATCH v2 0/5] perf, bts: Fallout from the fuzzer for perf/urgent

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Message-ID: <alpine.DEB.2.11.1609062009450.3432@pianoman.cluster.toy>
Date:   Tue, 6 Sep 2016 20:13:27 -0400 (EDT)
From:   Vince Weaver <vince@...ter.net>
To:     Ingo Molnar <mingo@...nel.org>
cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        eranian@...gle.com, Arnaldo Carvalho de Melo <acme@...radead.org>,
        vincent.weaver@...ne.edu
Subject: Re: [PATCH v2 0/5] perf, bts: Fallout from the fuzzer for
 perf/urgent

On Tue, 6 Sep 2016, Ingo Molnar wrote:

> > There were more bugs since the previous version, plus the BTS barriers got 
> > fixed. With these patches, my testcase keeps running and no spurious NMI 
> > warnings pop up any more.
> 
> Could you please also run the fuzzer that Vince uses, does it now pass 
> on hardware you have access to?

I ran 4.8-rc5 with these patches applied on a Skylake machine that shows 
the various bts problems pretty quickly normally.

It ran a while and didn't hit any of them, but it did fall over with RCU 
errors that are (probably) unrelated.  

I'd have a better report but I'm having a lot of trouble getting kernel 
oopses to appear on the serial console with this new install on the 
skylake machine.  It may not be totally systemd's fault but I am going to 
blame it anyway.

Vince