From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E71C3C432C0 for ; Tue, 3 Dec 2019 16:04:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF308206E4 for ; Tue, 3 Dec 2019 16:04:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575389071; bh=oDFsbxgD5A95Nwp80yYyEw0eJtZ1q1iqcErmr0CW5MU=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=UmsX8dxTpNzQiSlA4Nkgm+1C7kyr2ZmP1rvHUw5iF0sLxcB5wQpjyr6XniJBicMMU kAo/0bg/y6ePYIANol2W7aHz5EQEemCXSNUniBeG+FdcmTUfJ/i6O1NZykKSF0I3zc EWy71keySNOpnmZr3kNDkJ7ucFL+0Ei01jxjOdxQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727206AbfLCQEa (ORCPT ); Tue, 3 Dec 2019 11:04:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:55058 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726480AbfLCQEa (ORCPT ); Tue, 3 Dec 2019 11:04:30 -0500 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CF74D2068E; Tue, 3 Dec 2019 16:04:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575389070; bh=oDFsbxgD5A95Nwp80yYyEw0eJtZ1q1iqcErmr0CW5MU=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=HXbIwJZ4oEv1QVPreYfTg5bdyyYy94SFdJXuK7e5llmpYJ7ol0IsP3yeriHTiLXO8 NXgbFYOFEt8jkly/wdaKIcL8Oj24gLOuzZAyLf8ZK8LXwC5JOuc5AUb5U1Pa1q1O9v y/R363m0AqGL+UdeaoJXaNj9RRE2FkLT4RlQ63ZY= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 9D4A93522780; Tue, 3 Dec 2019 08:04:24 -0800 (PST) Date: Tue, 3 Dec 2019 08:04:24 -0800 From: "Paul E. McKenney" To: Tejun Heo Cc: Peter Zijlstra , jiangshanlai@gmail.com, linux-kernel@vger.kernel.org, Ingo Molnar , Thomas Gleixner Subject: Re: Workqueues splat due to ending up on wrong CPU Message-ID: <20191203160424.GD2889@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20191125230312.GP2889@paulmck-ThinkPad-P72> <20191126183334.GE2867037@devbig004.ftw2.facebook.com> <20191126220533.GU2889@paulmck-ThinkPad-P72> <20191127155027.GA15170@paulmck-ThinkPad-P72> <20191128161823.GA24667@paulmck-ThinkPad-P72> <20191129155850.GA17002@paulmck-ThinkPad-P72> <20191202015548.GA13391@paulmck-ThinkPad-P72> <20191202201338.GH16681@devbig004.ftw2.facebook.com> <20191203095521.GH2827@hirez.programming.kicks-ass.net> <20191203154251.GC2196666@devbig004.ftw2.facebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191203154251.GC2196666@devbig004.ftw2.facebook.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 03, 2019 at 07:42:51AM -0800, Tejun Heo wrote: > Hello, > > On Tue, Dec 03, 2019 at 10:55:21AM +0100, Peter Zijlstra wrote: > > The below seems to not insta explode... > > Paul, any chance you can run Peter's patch through your test? I will give it a shot and report results late tomorrow morning, Pacific Time. (Yeah, slow, but beats the several-month test duration that would have been required previously!) Thanx, Paul