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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 B8889C4320E for ; Mon, 30 Aug 2021 20:15:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 99EF860241 for ; Mon, 30 Aug 2021 20:15:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234675AbhH3UQv (ORCPT ); Mon, 30 Aug 2021 16:16:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232906AbhH3UQu (ORCPT ); Mon, 30 Aug 2021 16:16:50 -0400 Received: from mail-lj1-x22f.google.com (mail-lj1-x22f.google.com [IPv6:2a00:1450:4864:20::22f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C9D26C061575 for ; Mon, 30 Aug 2021 13:15:55 -0700 (PDT) Received: by mail-lj1-x22f.google.com with SMTP id j12so27921183ljg.10 for ; Mon, 30 Aug 2021 13:15:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RdkLBxeprc22pYzDrCGRhm5Mln6o/u5YuB0oLAShsfU=; b=SvQjZPnrKDQjoOS7De5eX7kZmrBx8eC1vg6xlCXuICo8J1kvbzxn9dHJ8HcjngZPv4 gOe/9w6uT+FaAzMIiF3Oz/9mr9TlVU1tB1bUF9h/MPSHovgRZzP1BImuFmVtuvtc+2A6 yzZ1Obpw0jtxLiElMSWmEulWzxyPRVL66CIO4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RdkLBxeprc22pYzDrCGRhm5Mln6o/u5YuB0oLAShsfU=; b=bBysxpCJG9CxjcaZHVRVvLk4DD4IiZxCIaJk86VRBMUtrBrsKHcecE84HNWbdmHIEd J3lMxx1o1fRso2G/gBqt+S2odJlLmhLl0sFU+hUikroR0KQzie2Gy/TDIkVyIGOugZfZ 4BHiC2y9PT6GAQE7WYSmUhloyFyiphg4b/x3jlmAmUyIDB8s+Rti0FxS+OIB5cos/TZl QFYznLoqfPdQ0ciflaPV7ENiZOiS4vtfK7vNUbqq2pQEhb/DUvIuOu5/SZ96Um5urVqy +maIiYh9oZGehnfBA2Cuu9xejuM6xEONRGaQKUyPyGzBMEYxxsWng324eLuPEa5No3v2 aEmw== X-Gm-Message-State: AOAM5338opLyp3LU37uLsa5M+b9rY5cIAdxYpDRayIpQ4HW5u4m8d/q7 P6Yqn26ePITiyhtSAubR4nistxQCsxgDf6h7oU0= X-Google-Smtp-Source: ABdhPJxfE6vJz8stIlXYZWAzUumcVl2wIq3NbzEFIOvU655AVmaokw1E53jN6SfkMnpgW7oOwxZ5kA== X-Received: by 2002:a2e:22c6:: with SMTP id i189mr21595378lji.144.1630354553932; Mon, 30 Aug 2021 13:15:53 -0700 (PDT) Received: from mail-lf1-f44.google.com (mail-lf1-f44.google.com. [209.85.167.44]) by smtp.gmail.com with ESMTPSA id k20sm761422lfm.93.2021.08.30.13.15.53 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 30 Aug 2021 13:15:53 -0700 (PDT) Received: by mail-lf1-f44.google.com with SMTP id m18so19517925lfl.10 for ; Mon, 30 Aug 2021 13:15:53 -0700 (PDT) X-Received: by 2002:a05:6512:228f:: with SMTP id f15mr6228220lfu.253.1630354553028; Mon, 30 Aug 2021 13:15:53 -0700 (PDT) MIME-Version: 1.0 References: <20210830201225.GA2671970@roeck-us.net> In-Reply-To: <20210830201225.GA2671970@roeck-us.net> From: Linus Torvalds Date: Mon, 30 Aug 2021 13:15:37 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Linux 5.14 To: Guenter Roeck , Heiko Carstens , Vasily Gorbik , Christian Borntraeger Cc: Linux Kernel Mailing List , Peter Zijlstra , linux-s390 Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 30, 2021 at 1:12 PM Guenter Roeck wrote: > > So far so good, but there is a brand new runtime warning, seen when booting > s390 images. > > [ 3.218816] ------------[ cut here ]------------ > [ 3.219010] WARNING: CPU: 1 PID: 0 at kernel/sched/core.c:5779 sched_core_cpu_starting+0x172/0x180 > [ 3.222845] Call Trace: > [ 3.222992] [<0000000000186e86>] sched_core_cpu_starting+0x176/0x180 > [ 3.223114] ([<0000000000186dc4>] sched_core_cpu_starting+0xb4/0x180) > [ 3.223182] [<00000000001963e4>] sched_cpu_starting+0x2c/0x68 > [ 3.223243] [<000000000014f288>] cpuhp_invoke_callback+0x318/0x970 > [ 3.223304] [<000000000014f970>] cpuhp_invoke_callback_range+0x90/0x108 > [ 3.223364] [<000000000015123c>] notify_cpu_starting+0x84/0xa8 > [ 3.223426] [<0000000000117bca>] smp_init_secondary+0x72/0xf0 > [ 3.223492] [<0000000000117846>] smp_start_secondary+0x86/0x90 > > Commit 3c474b3239f12 ("sched: Fix Core-wide rq->lock for uninitialized > CPUs") seems to be the culprit. Indeed, the warning is gone after reverting > this commit. Ouch, not great timing. Adding the s390 people to the cc too, just to make sure everybody involved is aware. Linus