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
