linux-kernel - Re: perf, kprobes: fuzzer generates huge number of WARNings

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Date:	Mon, 6 Jul 2015 23:53:46 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	linux-kernel@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf, kprobes: fuzzer generates huge number of WARNings

On Mon, 6 Jul 2015, Steven Rostedt wrote:

> On Mon, 6 Jul 2015 17:27:04 -0400 (EDT)
> Vince Weaver <vincent.weaver@...ne.edu> wrote:
> > [ 3521.650521] ---[ end trace a413501925547ed5 ]---
> > [ 3521.655960] ftrace failed to modify [<ffffffff81196730>] handle_mm_fault+0x0/0x1750
> > [ 3521.664767]  actual: e8:cb:18:ef:1e
> 
> Hmm, it was not expecting to see this address above in the mcount slot.
> Did you have other tracing going on, or did you add a kprobe to
> handle_mm_fault too?

it's fuzzing so there were potentially a large number of tracepoint events 
active at the time.  Only one kprobe event, 
	p:probe/VMW _text+1664816
and I forget what that actually mapped to originally.

Vince
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