linux-kernel - Re: perf,arm -- another (different) fuzzer oops

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Date:	Thu, 8 Aug 2013 09:40:08 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	Will Deacon <will.deacon@....com>
cc:	Vince Weaver <vincent.weaver@...ne.edu>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"trinity@...r.kernel.org" <trinity@...r.kernel.org>
Subject: Re: perf,arm -- another (different) fuzzer oops

On Thu, 8 Aug 2013, Will Deacon wrote:

> On the flip side, the good news is that we know the problem is there. We're
> probably generating interrupts at some horrendous rate for the lock-up....
> are you running your fuzzer as root?

No, I'm running the fuzzer as a regular user.

> Also, is your fuzzer available somewhere? I could take it for a spin on some
> different architectures if you like.

Yes:

  git clone https://github.com/deater/perf_event_tests.git

and it's in the "fuzzer" subdirectory.  I think I've committed all of the 
ARM related patches.

To run the tool it's just "./perf_fuzzer" and away you go.  There's a lot 
of other tools for generating and analyzing fuzzer syscall traces but 
unfortunately they're not very user-friendly yet.

As for other architectures (at least ARM) in addition to the pandaboard I 
also have a beagleboard and a cortex-A15 chromebook.  The challenge is 
always getting recent Linus-git kernels running on the things.

I also have a raspberry-pi.  I've successfully accessed the perf counters 
on that by reading the low-level registers directly with a kernel 
modulue.  There's no perf driver because the PMU interrupt isn't hooked 
up.  I've been meaning to get perf support going by making things 
periodically polled rather than interrupt driven: has anybody looked into 
doing that yet?

Vince

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