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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH, USER_AGENT_MUTT autolearn=ham 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 AA481C4321A for ; Tue, 11 Jun 2019 18:52:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C3A82173B for ; Tue, 11 Jun 2019 18:52:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560279131; bh=Af2Xf7oCOA4TNNRVlRh/3Omz2g+vvajcN7rh7OOMonQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=CPStBqbbb5dxyCEYroRMx6R7GNGjXWjgUZ0M8TFhJwK8Ix7JbeHoTZi77lNi9UEQG n9rbUK9YdgCFVbSsCqyFduBpVJDQ2+SPh1Ir60LO3yo9h8kyIVY0FwpHYx7YErSPoR oQHs9qPyt0wGbntAy4ddFTe03O2WAn6xwS4Kza7A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392131AbfFKSwK (ORCPT ); Tue, 11 Jun 2019 14:52:10 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:39071 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389470AbfFKSwK (ORCPT ); Tue, 11 Jun 2019 14:52:10 -0400 Received: by mail-pf1-f196.google.com with SMTP id j2so7997956pfe.6 for ; Tue, 11 Jun 2019 11:52:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=Yy0OWXyZ8KVFOzQyma6HgIMdzu+QpAU/FsXhUq9xLso=; b=ej7JmHmwRccfgX6J9SleW4kdB4KDGp/zlkFhjqLihF0Qg20fcfmQPNhv8Yo4vVgzFb r6fl2Yh7LPmoTyKpA+k8WVRXZdX/l/CCm7ERyV7UpACwM5LA9X0dF8loQVuqkTDm1xxe 2um711N+byV34Tmma9+No0AiRSItUAz1slLbsBcK5OZpIJp2/MSnCIFBcXz2bM4HdRXa 0PLKAwPi3/q4MlFjauQifoFZXFtBlv5aZjExLl49KxcuNh4TL9MpoBWQgjVcG74dLIZz FaY5mQhKhROOkpNRjSG4XKe/tZ+8wTWe/68kw4aj8IDDWMkjwq7/2F9/43z3WEj3D3dS rmQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=Yy0OWXyZ8KVFOzQyma6HgIMdzu+QpAU/FsXhUq9xLso=; b=W5piQtQej3h8/X8Ci0ZRJJerK1WSStlyE8Kn2NYzRhP6PiQskWvbIAfENFMwfaIW4k VrlqrMx3o8iw8Em90hKnwR1x59SWrH00MC5NhOylsXqeiCD536N0Hh+6q2DSDc6lcYXY VAqQ9z+eil8tzuH7N7UztTUV9xC7fo4KzT4NgCYLsH8QDaaQ3Mn/ChTG0VACYbXNX3v9 ta8aX5jA1KhrNwsOZet6g26J5RX0XWkffMvJf7Q0k6ayFTKkFDfrNPrgY3cBYrNuugF2 3/Rt9a1CznHvmk07vErVus+aEJYzfKVmB2XkWyZ+a0qwg1/R007z2jKfot6+MYOA7hie rFQg== X-Gm-Message-State: APjAAAXyozzb/HMnOWk+JItG10orRYHeB5rZ3ERXR5FVTm1jLTN4ZfR1 Ar/SoPUwpMYantXb0/9HjMk= X-Google-Smtp-Source: APXvYqxZttuM3YSEYQATNQB0u9z+UnACicWJQv56CJx/lsbzVj1DKqMvzdoAzz3koBp9Fe7tzkSuEQ== X-Received: by 2002:a17:90a:30cf:: with SMTP id h73mr28803429pjb.42.1560279129539; Tue, 11 Jun 2019 11:52:09 -0700 (PDT) Received: from localhost ([2620:10d:c091:500::2:1677]) by smtp.gmail.com with ESMTPSA id a12sm8962468pje.3.2019.06.11.11.52.07 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 Jun 2019 11:52:08 -0700 (PDT) Date: Tue, 11 Jun 2019 11:52:06 -0700 From: Tejun Heo To: Dmitry Vyukov Cc: syzbot , Lai Jiangshan , mwb@linux.vnet.ibm.com, LKML , syzkaller-bugs Subject: Re: linux-next boot error: WARNING: workqueue cpumask: online intersect > possible intersect Message-ID: <20190611185206.GG3341036@devbig004.ftw2.facebook.com> References: <000000000000f19676058ab7adc4@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, On Fri, Jun 07, 2019 at 10:45:45AM +0200, Dmitry Vyukov wrote: > +workqueue maintainers and Michael who added this WARNING > > The WARNING was added in 2017, so I guess it's a change somewhere else > that triggered it. > The WARNING message does not seem to give enough info about the caller > (should it be changed to WARN_ONCE to print a stack?). How can be root > cause this and unbreak linux-next? So, during boot, workqueue builds masks of possible cpus of each node and stores them on wq_numa_possible_cpumask[] array. The warning is saying that somehow online cpumask of a node became a superset of the possible mask, which should never happen. Dumping all masks in wq_numa_possible_cpumasks[] and cpumask_of_node() of each node should show what's going on. Thanks. -- tejun