Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751753AbdIKOVh (ORCPT ); Mon, 11 Sep 2017 10:21:37 -0400 Received: from ud10.udmedia.de ([194.117.254.50]:51672 "EHLO mail.ud10.udmedia.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750936AbdIKOVg (ORCPT ); Mon, 11 Sep 2017 10:21:36 -0400 Date: Mon, 11 Sep 2017 16:21:33 +0200 From: Markus Trippelsdorf To: Tejun Heo Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, "Luis R. Rodriguez" , "Eric W. Biederman" , "Paul E. McKenney" Subject: Re: Worker threads in D state since c5a94a618e7ac86 (workqueue: Use TASK_IDLE) Message-ID: <20170911142133.GA2265@x4> References: <20170910073653.GA284@x4> <20170911131128.GD1774378@devbig577.frc2.facebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170911131128.GD1774378@devbig577.frc2.facebook.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 996 Lines: 33 On 2017.09.11 at 06:11 -0700, Tejun Heo wrote: > Hello, > > On Sun, Sep 10, 2017 at 09:36:53AM +0200, Markus Trippelsdorf wrote: > > Since: > > > > commit c5a94a618e7ac86b20f53d947f68d7cee6a4c6bc > > Author: Peter Zijlstra > > Date: Wed Aug 23 13:58:44 2017 +0200 > > > > workqueue: Use TASK_IDLE > > > > > > all worker threads are in D state. They all show up when using "magic > > SysRq w". In htop they all have big fat red 'D' in the state column. > > Is this really desirable? > > > > I have attached the output of "ps aux" after boot and the SysRq-w > > output. > > Hmm.... looks like we better revert until we figure out how this > should get presented in debugging facilities / to userspace. Peter? BTW rcu recently introduced the same issue: commit d5374226c3e444239e063f005dfb59cae4390db4 Author: Luis R. Rodriguez Date: Tue Jun 20 14:45:47 2017 -0700 rcu: Use idle versions of swait to make idle-hack clear -- Markus