Re: perf: perf_fuzzer lockup in perf_cgroup_attach

Peter Zijlstra
2016-09-15T07:15:09Z

On Wed, Sep 14, 2016 at 10:43:29PM -0400, Vince Weaver wrote:
>
> so the skylake that was fuzzing finally is mostly locked up.
>
> Really hard to tell what's going, especially as KASLR made looking up the
> addresses a big pain.
>
> The best I can tell things are getting wedged somehow in
> perf_cgroup_switch() while interrupts are disabled. Interrupts are never
> getting re-enabled, causing the RCU and NMI watchdogs to trigger (and more
> alarming things like the SATA bus resetting).

How do you go about using cgroups? Do you set them up yourself, does the
fuzzer do so?