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

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Message-ID: <4ee9ffee-4f04-dec0-c4e8-244993eb8111@linux.ee>
Date:   Wed, 4 Dec 2019 21:47:31 +0200
From:   Meelis Roos <mroos@...ux.ee>
To:     Peter Zijlstra <peterz@...radead.org>, Jiri Olsa <jolsa@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: UBSAN: Undefined behaviour in arch/x86/events/intel/p6.c:116:29

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@...ux.ee>