From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753869AbdHUUId (ORCPT ); Mon, 21 Aug 2017 16:08:33 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:49011 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753541AbdHUUIc (ORCPT ); Mon, 21 Aug 2017 16:08:32 -0400 Date: Mon, 21 Aug 2017 22:08:27 +0200 From: Peter Zijlstra To: Shubham Bansal Cc: mingo@redhat.com, acme@kernel.org, alexander.shishkin@linux.intel.com, LKML , syzkaller@googlegroups.com Subject: Re: events: possible deadlock in __perf_event_task_sched_out Message-ID: <20170821200827.GD32112@worktop.programming.kicks-ass.net> References: <20170821073237.46eir2fo47jtbhak@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22.1 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 21, 2017 at 01:58:13PM +0530, Shubham Bansal wrote: > > This is a WARN, printk is a pig. > > So, its not a bug? No, triggering the WARN is the problem, this is just fallout after that.