Re: UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29

[Meelis Roos]

04.12.19 17:06 Peter Zijlstra wrote:
> On Wed, Dec 04, 2019 at 01:15:40PM +0100, Jiri Olsa wrote:
> > On Tue, Dec 03, 2019 at 03:39:49PM +0200, Meelis Roos wrote:
> > > > Does something like so fix it?
> > >
> > > Unfortunately not (tested on top of todays git):
> >
> > hi,
> > which p6 model are you seeing this on?
> > how do you trigger that?
>
> Triggers on any p6 model. I hacked up perf and used "qemu-system-x86_64
> -cpu pentium2".
>
> The below seems to cure things.

Yes, works for me on Pentium M. The UBSAN warning is gone and everything seems to work as before.

Thank you!

--
Meelis Roos <mroos@xxxxxxxx>