Re: perf: perf_fuzzer lockup in perf_cgroup_attach

[Peter Zijlstra]

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?