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

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Message-ID: <20160819100130.GD10121@twins.programming.kicks-ass.net>
Date:   Fri, 19 Aug 2016 12:01:30 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Huang Rui <ray.huang@....com>
Subject: Re: perf: fuzzer crashes immediately on AMD system

On Thu, Aug 18, 2016 at 10:46:31AM -0400, Vince Weaver wrote:
> 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

OK, cannot reproduce on my fam15h/model1h. I'll go dig through the
various manuals to see if I can spot the fail.

Huang could you either prod someone at AMD or do yourself, audit the AMD
perf code for all the various new models?