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

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Message-ID: <20160301112013.GR6357@twins.programming.kicks-ass.net>
Date:	Tue, 1 Mar 2016 12:20:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	"Liang, Kan" <kan.liang@...el.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>,
	"zheng.z.yan@...el.com" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Core2 cpu triggers hard lockup with perf test

On Tue, Mar 01, 2016 at 12:06:51PM +0100, Jiri Olsa wrote:
> > 
> > [ Jiri, can you disable that stupid panic on hard lockup and let it run
> > for a while, see if all the lockup msgs hit the same IP? Also, can you
> > look where exactly that IP lives in the code? ]
> 
> im on it.. 

Thanks!

> also the patch that makes this happen just
> enlarge the buffer for PEBS:
> 
>   156174999dd1 perf/intel/x86: Enlarge the PEBS buffer
> 
> but I did not find anyaPEBS buffer lenght limitations in SDM

Probably just makes it easier to tickle.