Messages in this thread | | | Subject | Re: [perf] perf_fuzzer causes crash in intel_pmu_drain_pebs_nhm() | From | "Liang, Kan" <> | Date | Thu, 25 Feb 2021 15:15:26 -0500 |
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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
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