linux-kernel - Re: perf: fuzzer crashes immediately on AMD system

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Message-ID: <alpine.DEB.2.20.1608181046120.19862@macbook-air>
Date:	Thu, 18 Aug 2016 10:46:31 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-kernel@...r.kernel.org
cc:	Borislav Petkov <bp@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: perf: fuzzer crashes immediately on AMD system

On Thu, 18 Aug 2016, Vince Weaver wrote:

> Tried the perf_fuzzer on my A10 fam15h/model13h system with 4.8-rc2 and it
> falls over more or less immediately.
> 
> This maps to variable_test_bit()
> 	called by ctx = find_get_context(pmu, task, event);
> 		in kernel/events/core.c:9467
> 
> It happens quickly enough I can probably track down the exact event that 
> causes this, if needed.

I have a one line reproducer:

	perf stat -a -e amd_nb/config=0x37,config1=0x20/ /bin/ls