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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 91DADC433E9 for ; Thu, 28 Jan 2021 08:31:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4CCBA64D9D for ; Thu, 28 Jan 2021 08:31:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232047AbhA1Ibw (ORCPT ); Thu, 28 Jan 2021 03:31:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231773AbhA1Iaq (ORCPT ); Thu, 28 Jan 2021 03:30:46 -0500 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02865C061573 for ; Thu, 28 Jan 2021 00:30:06 -0800 (PST) Received: by mail-pl1-x62a.google.com with SMTP id d13so2938626plg.0 for ; Thu, 28 Jan 2021 00:30:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=lLx2GM7oGfSXnUAyxW1G0ulvLAw88x2lMXgNDEjl+LU=; b=VJHV+LdxhKUiwgrz7BV90s7UqJPI5SXslFodc7Au21SsGZW50fLz4G1yJRvoddfw79 3sVq7e2Ge4H+53veRfM2fmj2cFcu64Hc/sbfXyR0w3ksocIuuklSUS4QJ09izx8MiMW/ WkxolrLmIPOUh0z+zZPJ1qngJkt5hIyAqmeIBt/gCriGwsdjUPUnDGkdvLmQXfnpEu+a BHJP3UhHhEL6uj+zuPVSgho/frG2TE0jy/o85/46jZ+ZmSUEf3N3wnxhme4JWkQebbNG 3MSZYfUH5SzUHAEMvh0LJ6vHcnK03a/VN211UXR4dUSq2RHZ8MuRylmXg/PO2HxY7qz2 ck7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=lLx2GM7oGfSXnUAyxW1G0ulvLAw88x2lMXgNDEjl+LU=; b=jy1YsqHbKX1ixyYfNn8zXDq2vxOT0QVE34bo9kjcUqhbRQDeUbJ0bx4XNCo9WMHHQ1 XIse8EC55idF1A+vnjvp3T493yXCn/TkaV6i40mk2qfM3djela+Zs4kRrwKvs/K/9lr9 TdOKxTPsPKRSC8DlZ31HRgoFZ76OhqXkysCSONYErSxVn0bxXvLxawJO0nloPqrsEKMW gQ4VG8cnWyskaVSci3Hau6uUmr7OS59aszqGdf6NOSm76U7FDevQ7bkYh5grk3H0jdBA k656PPsy1+38cBFnp9FU0vDPzNBXYMpWmrIqrIDg6sXS3Wv5u+5QCat9uUM4QaPPkcx9 VFog== X-Gm-Message-State: AOAM5324D+NzB6QKk8WNkc0eA/9qXAujHw9T1uXQL0HHcTnS9j9whEBx UdzzP7WFmwVys0YCuhWxD7k= X-Google-Smtp-Source: ABdhPJyRi9XLCUm4I9VuceCq47G1KRRNJ4KNcOHVwhkKM4AoQjF5REu9oZQ2Z1wd9O6vjfaC2/yY4g== X-Received: by 2002:a17:903:1cc:b029:de:98bb:d46d with SMTP id e12-20020a17090301ccb02900de98bbd46dmr15550868plh.54.1611822605414; Thu, 28 Jan 2021 00:30:05 -0800 (PST) Received: from localhost ([2409:10:2e40:5100:6e29:95ff:fe2d:8f34]) by smtp.gmail.com with ESMTPSA id h2sm5052311pfk.4.2021.01.28.00.30.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jan 2021 00:30:04 -0800 (PST) Date: Thu, 28 Jan 2021 17:30:02 +0900 From: Sergey Senozhatsky To: John Ogness Cc: Sergey Senozhatsky , Petr Mladek , kernel test robot , LKML , lkp@lists.01.org, lkp@intel.com, zhengjun.xing@linux.intel.com Subject: Re: [printk] b031a684bf: INFO:rcu_tasks_detected_stalls_on_tasks Message-ID: References: <20210122081311.GA12834@xsang-OptiPlex-9020> <87bldaaxcc.fsf@jogness.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87bldaaxcc.fsf@jogness.linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (21/01/27 22:28), John Ogness wrote: > > # modprobe rcutorture onoff_interval=3 onoff_holdoff=30 torture_type=tasks > > (Those are the same modprobe parameters used by the lkp job.) > > After about a minute I see: > > [ 47.268292] tasks-torture: rcu_torture_read_exit: Start of episode > [ 51.273365] tasks-torture: rcu_torture_read_exit: End of episode > [ 55.823306] smpboot: do_boot_cpu failed(-1) to wakeup CPU#0 > [ 55.824350] tasks-torture:torture_onoff task: online 0 failed: errno -5 > [ 55.830661] tasks-torture:torture_onoff task: online 0 failed: errno -5 > [ 55.848524] tasks-torture:torture_onoff task: online 0 failed: errno -5 Just out of curious, this is seen only with the printk commit in question applied? do_boot_cpu() doesn't seem to call a lot of printk-s, only pr_debug("Setting warm reset code and vector.\n"), as far as I can tell. I can't repro this on my arm64 board. Maybe it's too slow. Race condition? -ss