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=-3.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 79D08C07E95 for ; Wed, 7 Jul 2021 15:31:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 572CE61CC5 for ; Wed, 7 Jul 2021 15:31:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232266AbhGGPdr (ORCPT ); Wed, 7 Jul 2021 11:33:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231721AbhGGPdq (ORCPT ); Wed, 7 Jul 2021 11:33:46 -0400 Received: from mail-oi1-x22d.google.com (mail-oi1-x22d.google.com [IPv6:2607:f8b0:4864:20::22d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED2E8C061574; Wed, 7 Jul 2021 08:31:05 -0700 (PDT) Received: by mail-oi1-x22d.google.com with SMTP id w74so3775726oiw.8; Wed, 07 Jul 2021 08:31:05 -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; bh=wu589UyEpwCPZKdfA998XhHvrfJeA61TDfTMoVhy+pk=; b=bHrhj8aFx9B845mrCCqVMvwm56Xreg7IIlcIRbUH0VAR4z3eKoxxUyXhnstq2YBIdt m0V6pO6Rnkyk0cOfuYOj7xOySa6e8MGWKsYewPlEU4XR0ASg0P9T33R6T/ff/Oo21684 qq8d94XC0Uzsj362ZpknoiBN5nj2mzBcE/ttEspCRQFLJl6vKKyaZv85bMHEz11u1Ztr Qb0fMjepKZvRsQV1Mugu8B4JGQY7efw7KXstRDM9zQGqPznOdKuYMyf+oY0QTn8Lsroh dZJR2CPELJRpYIPVsgSyNBJGDQb5SjRLsUgwgxpi1CU4M/fJQLHz7x4pvUXOVkBoX2zR 6r6A== 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; bh=wu589UyEpwCPZKdfA998XhHvrfJeA61TDfTMoVhy+pk=; b=jDg4In1ox6r2MmeRaVDOIF8588NmBigt+Ck0r04afEjcP4XN+MA4CUXbExeeocjFT4 wJW1DfP7abxn5r3jw3F/etX3sjy3vNFOXXZE+6hrDxazaPZ7hPMgZ3PBhI2q3LKYwgSg eOvuGIsD7serPjgndgxvv39VpXgzwomLgsVnNZsVDhMZxD/JJoK9ts1rVpCIxaMJMcbv rs/YXXEPQRXKqe2DllBNVKOqioXKOCUAJ0IIQjaqzM26WH7ZEPitobzjys7Rsm3NdNhT qFWRx7soV+gZO0G/90Urmar56Uj+vZPKGfLlHaFHY4c7ZXLexwN0z7TmfGhYZyscRqYs P9FQ== X-Gm-Message-State: AOAM533320q8QD6q4kqDiMSUfXzvYTcilpz05y/ZlGMPvflQjNFwy31X jGpoBS+JlyiJlMGieBkuf58= X-Google-Smtp-Source: ABdhPJyoBc3Zr0VgUI8Aq6qjdaQ1z5XORqMS6vMI3+Oopvw0S7h+Hp71EWwKOIwftVjKxVjKBJaWBA== X-Received: by 2002:aca:534b:: with SMTP id h72mr7724461oib.21.1625671865355; Wed, 07 Jul 2021 08:31:05 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id a7sm3555730ooo.9.2021.07.07.08.31.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 08:31:04 -0700 (PDT) Sender: Guenter Roeck Date: Wed, 7 Jul 2021 08:31:02 -0700 From: Guenter Roeck To: Valentin Schneider Cc: Alexey Kardashevskiy , Frederic Weisbecker , linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org, Ingo Molnar , Peter Zijlstra , x86@kernel.org Subject: Re: [tip: sched/core] sched/core: Initialize the idle task with preemption disabled Message-ID: <20210707153102.GA1243141@roeck-us.net> References: <20210512094636.2958515-1-valentin.schneider@arm.com> <162081815405.29796.14574924529325899839.tip-bot2@tip-bot2> <20210706194456.GA1823793@roeck-us.net> <87fswr6lqv.mognet@arm.com> <20210707120305.GB115752@lothringen> <87czru727k.mognet@arm.com> <878s2i6uk2.mognet@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <878s2i6uk2.mognet@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 07, 2021 at 03:57:17PM +0100, Valentin Schneider wrote: > On 08/07/21 00:35, Alexey Kardashevskiy wrote: > > On 08/07/2021 00:14, Guenter Roeck wrote: > >> > >> Can you reproduce the problem with a powerpc qemu emulation ? > >> If so, how do you reproduce it there ? Reason for asking is that I don't > >> see > >> the problem with any of my powerpc emulations, and I would like to add test > >> case(s) if possible. > > > > I can reproduce the problem on powerpc easily - qemu with "-smp 2" does it. > > > > So on powerpc I'm chasing a slightly different problem, reported at > [1]. I couldn't get it to trigger on qemu for powerpc64, and I'm still > struggling with powerpc. Could you please share you qemu invocation & > kernel .config? Thanks. > Same here. Actually, worse: All 32-bit ppc emulations I tried to run with more than 1 CPU crash when bringing up the 2nd CPU, and that even happens with 5.13. So, yes, please share your qemu command line and the kernel configuration. Thanks, Guenter