linux-kernel - Re: perf,ftrace: fuzzer triggers warning in trace_events

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Message-ID: <alpine.DEB.2.20.1506122113580.5662@vincent-weaver-1.umelst.maine.edu>
Date:	Fri, 12 Jun 2015 21:15:10 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf,ftrace: fuzzer triggers warning in trace_events_filter
 code

On Fri, 12 Jun 2015, Steven Rostedt wrote:

> On Fri, 12 Jun 2015 17:18:22 -0400 (EDT)
> Vince Weaver <vincent.weaver@...ne.edu> wrote:
> 
> > 
> > So I've modified my fuzzer to try to exercise the 
> > PERF_EVENT_IOC_SET_FILTER ioctl() and it is starting to turn up some 
> > warnings.
> 
> Is there any way to know what the filter string you used that generated
> this?

Various seem to trigger it.  One example is

	ext4:ext4_truncate_exit
	(((dev<=913)blocks==916)common_type&756)

Vince
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