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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,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 18CD9C10DCE for ; Sun, 8 Mar 2020 21:18:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D4F9A2083E for ; Sun, 8 Mar 2020 21:18:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="N7Y4SU6T" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726354AbgCHVSa (ORCPT ); Sun, 8 Mar 2020 17:18:30 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:52852 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726352AbgCHVSa (ORCPT ); Sun, 8 Mar 2020 17:18:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583702309; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=XDFf6JJJ7oL8PZR807yO8QrfcQ0rQRkQyjpFnIU1DFg=; b=N7Y4SU6TTV8wgHWdurdsE+wlglddl5k2OF4Ohm2SJQpsn63MZiaRVgunGLH+lk9Kv60Nah aSj5wvZGSDyRXihHKIJCj4ldtW5Bfz6S1wKV5wpb/X0KOOd7LYg2/52Z8QxUg/H4tVFilJ /RZSymNhiKN3vHArIH3a8CZXWlhj4s4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-45-j7H4v-dmMfS0qUjk-mtQVg-1; Sun, 08 Mar 2020 17:18:25 -0400 X-MC-Unique: j7H4v-dmMfS0qUjk-mtQVg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E8DDE1005509; Sun, 8 Mar 2020 21:18:23 +0000 (UTC) Received: from llong.remote.csb (ovpn-120-251.rdu2.redhat.com [10.10.120.251]) by smtp.corp.redhat.com (Postfix) with ESMTP id DB9A15D9C5; Sun, 8 Mar 2020 21:18:21 +0000 (UTC) Subject: Re: Hard lockups due to "tick/common: Make tick_periodic() check for missing ticks" To: Qian Cai , Thomas Gleixner Cc: "Joel Fernandes (Google)" , "Paul E. McKenney" , rcu@vger.kernel.org, LKML , Peter Zijlstra , Will Deacon , Ingo Molnar , Frederic Weisbecker References: From: Waiman Long Organization: Red Hat Message-ID: <68ef67a1-306f-ee87-14c8-14f8863a67a1@redhat.com> Date: Sun, 8 Mar 2020 17:18:21 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Content-Transfer-Encoding: quoted-printable Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org On 3/6/20 10:33 PM, Qian Cai wrote: > >> On Mar 5, 2020, at 11:06 PM, Qian Cai wrote: >> > Using this config, > >> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config > Reverted the linux-next commit d441dceb5dce (=E2=80=9Ctick/common: Make= tick_periodic() check for missing ticks=E2=80=9D) > fixed the lockup that could easily happen during boot. > I will take a look at that and get back to you ASAP. Thanks, Longman