Issue with perf on qemu on linux 4.4

Hi Alex -

I'm wondering if you can help or suggest the best way to report an issue we found while adding perf testing to LKFT.

https://bugs.linaro.org/show_bug.cgi?id=4320

This issue is only seen on 4.4 (we test 4.4, 4.9, 4.14, 4.19, mainline, next), and only on qemu/x86_64 and qemu/i386 (those architectures work fine when run on hardware). Reproducer is simple, just run 'perf record -e cycles -o perf-lava-test.data ls -a'.

Thanks, Dan