linux-kernel - Re: [perf] perf_fuzzer causes crash in intel_pmu_drain_pebs

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Date:   Thu, 25 Feb 2021 15:15:26 -0500
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Vince Weaver <vincent.weaver@...ne.edu>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [perf] perf_fuzzer causes crash in intel_pmu_drain_pebs_nhm()



On 2/11/2021 5:14 PM, Vince Weaver wrote:
> On Thu, 11 Feb 2021, Liang, Kan wrote:
> 
>>> On Thu, Jan 28, 2021 at 02:49:47PM -0500, Vince Weaver wrote:
>> I'd like to reproduce it on my machine.
>> Is this issue only found in a Haswell client machine?
>>
>> To reproduce the issue, can I use ./perf_fuzzer under perf_event_tests/fuzzer?
>> Do I need to apply any parameters with ./perf_fuzzer?
>>
>> Usually how long does it take to reproduce the issue?
> 
> On my machine if I run the commands
> 		echo 1 > /proc/sys/kernel/nmi_watchdog
>                  echo 0 > /proc/sys/kernel/perf_event_paranoid
>                  echo 1000 > /proc/sys/kernel/perf_event_max_sample_rate
>                  ./perf_fuzzer -s 30000 -r 1611784483
> 
> it is repeatable within a minute, but because of the nature of the fuzzer
> it probably won't work for you because the random events will diverge
> based on the different configs of the system.
> 
> I can try to generate a simple reproducer, I've just been extremely busy
> here at work and haven't had the chance.
> 
> If you want to try to reproduce it the hard way, run the
> 	./fast_repro99.sh
> script in the perf_fuzzer directory.  It will start fuzzing.  My machine
> turned up the issue within a day or so.
>
Sorry for the late response. Just want to let you know I'm still trying 
to reproduce the issue.

I only have a Haswell server on hand. I run the ./fast_repro99.sh on the 
machine for 3 days, but I didn't observe any crash.
Now, I'm looking for a HSW client in my lab. I will check if I can 
reproduce it on a client machine.

If you have a simple reproducer, please let me know.

Thanks,
Kan