From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752266AbcHWRJJ (ORCPT ); Tue, 23 Aug 2016 13:09:09 -0400 Received: from mga02.intel.com ([134.134.136.20]:62984 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751847AbcHWRJG (ORCPT ); Tue, 23 Aug 2016 13:09:06 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.28,567,1464678000"; d="scan'208";a="1030111609" From: Alexander Shishkin To: Will Deacon Cc: Vince Weaver , Linux Kernel Mailing List , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo Subject: Re: perf: WARNING: kernel/events/core.c:4893 perf_mmap_close In-Reply-To: <20160823151239.GA29462@arm.com> References: <87k2fqmska.fsf@ashishki-desk.ger.corp.intel.com> <20160823151239.GA29462@arm.com> User-Agent: Notmuch/0.21 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-pc-linux-gnu) Date: Tue, 23 Aug 2016 20:08:23 +0300 Message-ID: <87vayrl8fs.fsf@ashishki-desk.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Will Deacon writes: > Hi Alexander, > > On Fri, Aug 12, 2016 at 08:54:49PM +0300, Alexander Shishkin wrote: >> Yes, I tracked to a race between unmapping and set_output, trying to >> come up with a good fix now. > > Did you get anywhere with this? I think I just hit the same issue with > the intel-pt driver on my broadwell laptop with -rc3+PREEMPT (dump > below) and I'm more than happy to test a fix. Yes, I posted a patchset [1] this morning that should fix this; if this is PT, 3/3 should suffice. What's "pt-poker", btw? :) [1] http://marc.info/?l=linux-kernel&m=147194269031047 Regards, -- Alex