Re: perf: perf_fuzzer lockup in perf_cgroup_attach

Josh Poimboeuf
2016-09-15T12:10:25Z

On Thu, Sep 15, 2016 at 09:24:25AM +0200, Peter Zijlstra wrote:
> On Wed, Sep 14, 2016 at 10:35:49PM -0700, Stephane Eranian wrote:
> > On Wed, Sep 14, 2016 at 7:43 PM, Vince Weaver <vincent.weaver@maine.edu> 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.
> > >
> > I would think there is a way to disable KASLR for this kind of testing!
>
> I always kill CONFIG_RANDOMIZE_BASE, but there's also talk of killing
> the address print entirely.. :-(
>
> https://lkml.kernel.org/r/20160831165303.tvcudt7wkpechuqt@treble

So you should be able to do something like:

echo "list *driver_probe_device+0x223" |gdb vmlinux |grep "is in"

Though that's admittedly quite a bit slower than addr2line.

--
Josh