Re: perf: fuzzer crashes immediately on AMD system

From	Vince Weaver <vincent.weaver@maine.edu>
Newsgroups	linux.kernel
Subject	Re: perf: fuzzer crashes immediately on AMD system
Date	2016-08-18 16:50 +0200
Message-ID	<s7wNQ-16E-25@gated-at.bofh.it> (permalink)
References	<s7wNQ-16E-27@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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

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Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-18 16:50 +0200
  Re: perf: fuzzer crashes immediately on AMD system Peter Zijlstra <peterz@infradead.org> - 2016-08-19 12:10 +0200
    Re: perf: fuzzer crashes immediately on AMD system Peter Zijlstra <peterz@infradead.org> - 2016-08-19 13:00 +0200
    Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-19 17:10 +0200
      Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-19 18:40 +0200
    Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-20 06:50 +0200
    Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-23 03:20 +0200
      Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-23 05:00 +0200
        Re: perf: fuzzer crashes immediately on AMD system Peter Zijlstra <peterz@infradead.org> - 2016-08-23 10:50 +0200
          Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-23 14:10 +0200
            Re: perf: fuzzer crashes immediately on AMD system Ingo Molnar <mingo@kernel.org> - 2016-08-24 11:30 +0200
              Re: perf: fuzzer crashes immediately on AMD system Vince Weaver <vincent.weaver@maine.edu> - 2016-08-24 15:30 +0200

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