linux-kernel - Re: [perf] BUG: unable to handle kernel NULL pointer dereference at 00000085

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Message-ID: <20141007084044.GA12300@wfg-t540p.sh.intel.com>
Date:	Tue, 7 Oct 2014 16:40:44 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>,
	Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>,
	linux-kernel@...r.kernel.org, Dave Jones <davej@...hat.com>
Subject: Re: [perf] BUG: unable to handle kernel NULL pointer dereference at
 00000085

On Tue, Oct 07, 2014 at 10:17:32AM +0200, Peter Zijlstra wrote:
> On Tue, Oct 07, 2014 at 01:03:48PM +0800, Fengguang Wu wrote:
> > > What is lacking is the actual .config.
> > 
> > Sorry, attached the .config. I expected the script to auto attach it,
> > but obviously it's not yet perfect and failed to attach .config in
> > this case.
> 
> Sure no problem, just figured I'd tell you.
> 
> > > Also the times above (~285 seconds) seem to suggest userspace needs to
> > > do something ?
> > 
> > It's trinity. I'll try upgrade it, but it seems be valid for trinity
> > to feed kernel with any parameters that it can accept -- unless the
> > kernel completely rejects it one day.
> 
> OK, does it make sense to augment that script you have with a trinity
> parameter? Maybe have that userspace read the kernel cmdline and also
> run trinity when observed?  That way you can provide full
> reproduction environments, which it appears you're striving towards.

The trinity binary is included in the initrd image that it downloads,
and will auto run after boot up. I also plan to add trinity as a LKP
test case. :)

Thanks,
Fengguang
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