From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752832AbcCALUZ (ORCPT ); Tue, 1 Mar 2016 06:20:25 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:33454 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751976AbcCALUY (ORCPT ); Tue, 1 Mar 2016 06:20:24 -0500 Date: Tue, 1 Mar 2016 12:20:13 +0100 From: Peter Zijlstra To: Jiri Olsa Cc: "Liang, Kan" , Arnaldo Carvalho de Melo , Ingo Molnar , Andi Kleen , Stephane Eranian , Wang Nan , "zheng.z.yan@intel.com" , LKML Subject: Re: [BUG] Core2 cpu triggers hard lockup with perf test Message-ID: <20160301112013.GR6357@twins.programming.kicks-ass.net> References: <20160227123636.GB30858@krava.redhat.com> <37D7C6CF3E00A74B8858931C1DB2F0770589EC94@SHSMSX103.ccr.corp.intel.com> <20160301091703.GN6356@twins.programming.kicks-ass.net> <20160301110651.GA15260@krava.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160301110651.GA15260@krava.redhat.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.