From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753436AbbFDJkK (ORCPT ); Thu, 4 Jun 2015 05:40:10 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:44551 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752335AbbFDJkF (ORCPT ); Thu, 4 Jun 2015 05:40:05 -0400 Date: Thu, 4 Jun 2015 11:40:00 +0200 From: Peter Zijlstra To: Fengguang Wu Cc: LKP , LKML Subject: Re: [sched] WARNING: CPU: 0 PID: 10 at kernel/kthread.c:333 __kthread_bind_mask() Message-ID: <20150604094000.GE3644@twins.programming.kicks-ass.net> References: <20150604045450.GA30151@wfg-t540p.sh.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150604045450.GA30151@wfg-t540p.sh.intel.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 Thu, Jun 04, 2015 at 12:54:50PM +0800, Fengguang Wu wrote: > [ 2.442390] ------------[ cut here ]------------ > [ 2.443944] WARNING: CPU: 0 PID: 10 at kernel/kthread.c:333 __kthread_bind_mask+0x34/0x6e() > [ 2.446978] Modules linked in: > [ 2.448359] CPU: 0 PID: 10 Comm: khelper Not tainted 4.1.0-rc6-00314-g6455666 #4 > [ 2.450990] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014 > [ 2.454132] 0000000000000009 ffff88000f643d68 ffffffff81a3df14 0000000000000b02 > [ 2.470295] 0000000000000000 ffff88000f643da8 ffffffff810f308f 000000000f643da8 > [ 2.503291] ffffffff8110d116 ffff88000f55d580 ffff88000f5240c0 ffff88000f4936e0 > [ 2.506510] Call Trace: > [ 2.520770] [] dump_stack+0x4c/0x65 > [ 2.522479] [] warn_slowpath_common+0xa1/0xbb > [ 2.524334] [] ? __kthread_bind_mask+0x34/0x6e > [ 2.526219] [] warn_slowpath_null+0x1a/0x1c > [ 2.528069] [] __kthread_bind_mask+0x34/0x6e > [ 2.529925] [] kthread_bind_mask+0x13/0x15 > [ 2.531738] [] worker_attach_to_pool+0x39/0x7c > [ 2.546650] [] rescuer_thread+0x130/0x318 Ah, I clearly missed that the rescuer_thread() also did worker_attach_to_pool() from a !virgin kthread. Thanks > [ 2.548484] [] ? cancel_delayed_work_sync+0x15/0x15 > [ 2.550411] [] ? cancel_delayed_work_sync+0x15/0x15 > [ 2.552207] [] kthread+0xf8/0x100 > [ 2.553864] [] ? kthread_create_on_node+0x184/0x184 > [ 2.555795] [] ret_from_fork+0x42/0x70 > [ 2.557538] [] ? kthread_create_on_node+0x184/0x184 > [ 2.572520] ---[ end trace 362b92c9255ab666 ]--- > [ 2.574163] ------------[ cut here ]------------