Re: [BUG] Core2 cpu triggers hard lockup with perf test

From: Peter Zijlstra
Date: Sat Feb 27 2016 - 09:48:25 EST

On Sat, Feb 27, 2016 at 01:37:01PM +0100, Jiri Olsa wrote:
> we are getting hard lockups on Core2 cpus (model 23)

> I can't find what's special about Core2 CPU PEBS setup,
> it seems that oher CPUs are ok (tried on ivb/snb/hsw).
> reverting the 156174999dd1 fixed the issue for me
> ideas? thanks,

The obvious difference between Core2 and later chips is that Core2 only
has PEBS on a single counter (cnt0).

I'll try and have a closer look on Monday, I should still have a Core2
class machine around the house somewhere.