linux-kernel - Re: [PATCH] perf,x86: fix kernel crash with PEBS/BTS after suspend/resume

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Message-ID: <CAOULuOZ2Bx4ispxc9Jro27TfhFTsrsz90mokOHBRpbqGDXDFqw@mail.gmail.com>
Date:	Sat, 16 Mar 2013 18:06:13 -0400
From:	Parag Warudkar <parag.lkml@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf,x86: fix kernel crash with PEBS/BTS after suspend/resume

On Sat, Mar 16, 2013 at 1:56 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Sat, Mar 16, 2013 at 9:11 AM, Parag Warudkar <parag.lkml@...il.com> wrote:
>>
>> This seems to trigger a WARN_ON during suspend/resume.
>
> Ugh, yes. It's practically harmless, but it's ugly and technically
> wrong (we're using wrmsr_on_cpu() on our current cpu, but in a context
> where using it on anything else would be horribly broken).
>
> I think the attached patch should fix it. UNTESTED!

Applied and that seems to have suppressed the warning.

Unrelated to this now it dies in intel_pstate_timer_func doing what
seems to be a divide by zero.

Hopefully I will be able to capture the oops on camera next time.

Thanks,
Parag
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