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=-5.2 required=3.0 tests=BAYES_00, BUG6152_INVALID_DATE_TZ_ABSURD,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS,INVALID_DATE_TZ_ABSURD,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 2CF86C433E6 for ; Wed, 27 Jan 2021 21:25:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D755B60C3E for ; Wed, 27 Jan 2021 21:25:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234307AbhA0VZV (ORCPT ); Wed, 27 Jan 2021 16:25:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48952 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234150AbhA0VXm (ORCPT ); Wed, 27 Jan 2021 16:23:42 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41C5EC061574 for ; Wed, 27 Jan 2021 13:23:02 -0800 (PST) From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1611782580; 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: in-reply-to:in-reply-to:references:references; bh=II6M8iM5PIuvLXe9aK/VVdDXafw1OqaL8gCEsAXcvnk=; b=WUVHxkzpXwdrvLEovnJc+gLF3SjpK+ZsSAaANxaD1s+ZAdnweeZUmBGuv00CaP03chrsBU V8tDGWi1PL59W4gjaOM2iXlUJAI8cbe8SylPmm+rt0EPerOrXeSt59vO/FJ2LGX2c2cAR1 3wYpizXSzpmaYiEEZ6hDd7ewOFUmYnMJ57m0QnpyF+dufAsGlLwzgUrnZxb6nQkKc98zzy jYEL2Cx17p1bV5tirMqGj1kMX5hsr2WrjBXx8J3GU1z6nGWoSEz6Ot/3jkIuCmsHyOMqY4 +Ij4XNI+SB7ouVTsCo5cv/jqzKSBBHWY49cQj859KOD7jnQw92Xmg6A5QYZ5gw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1611782580; 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: in-reply-to:in-reply-to:references:references; bh=II6M8iM5PIuvLXe9aK/VVdDXafw1OqaL8gCEsAXcvnk=; b=QmNp86P08ti1jhKYyBpBD5eh6ghaSxiRuwndOEa+4CWhGoZpUuDYAJ/FRKNdYRfqYlYWwx cR1rn3Jp5CTQ5gDw== To: Sergey Senozhatsky , Petr Mladek Cc: kernel test robot , Sergey Senozhatsky , LKML , lkp@lists.01.org, lkp@intel.com, zhengjun.xing@linux.intel.com Subject: Re: [printk] b031a684bf: INFO:rcu_tasks_detected_stalls_on_tasks In-Reply-To: References: <20210122081311.GA12834@xsang-OptiPlex-9020> Date: Wed, 27 Jan 2021 22:28:59 +0106 Message-ID: <87bldaaxcc.fsf@jogness.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021-01-26, Sergey Senozhatsky wrote: > AFAIU this is just 'modprobe rcutorture' I was finally able to trigger this by using my workstation: Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz Debian/buster QEMU 3.1.0 (Debian 1:3.1+dfsg-8+deb10u8) instead of my build server: Intel(R) Xeon(R) CPU E5-2697 v4 @ 2.30GHz Debian/bullseye QEMU 5.2.0 (Debian 1:5.2+dfsg-3) I don't know what factors contributed, but I wanted to share my success in reproducing the reported problem. Instead of using lkp, I am manually booting with: $ kvm -cpu host -smp 2 -m 8G -nographic \ -kernel bzImage -append "console=ttyS0,115200 loglevel=6" \ -initrd initrd My initrd is a minimal busybox rootfs that runs: # 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 I will start to debug this now. John Ogness From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============4927472901388232857==" MIME-Version: 1.0 From: John Ogness To: lkp@lists.01.org Subject: Re: [printk] b031a684bf: INFO:rcu_tasks_detected_stalls_on_tasks Date: Wed, 27 Jan 2021 22:28:59 +0106 Message-ID: <87bldaaxcc.fsf@jogness.linutronix.de> In-Reply-To: List-Id: --===============4927472901388232857== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On 2021-01-26, Sergey Senozhatsky wrote: > AFAIU this is just 'modprobe rcutorture' I was finally able to trigger this by using my workstation: Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz Debian/buster QEMU 3.1.0 (Debian 1:3.1+dfsg-8+deb10u8) instead of my build server: Intel(R) Xeon(R) CPU E5-2697 v4 @ 2.30GHz Debian/bullseye QEMU 5.2.0 (Debian 1:5.2+dfsg-3) I don't know what factors contributed, but I wanted to share my success in reproducing the reported problem. Instead of using lkp, I am manually booting with: $ kvm -cpu host -smp 2 -m 8G -nographic \ -kernel bzImage -append "console=3DttyS0,115200 loglevel=3D6" \ -initrd initrd My initrd is a minimal busybox rootfs that runs: # modprobe rcutorture onoff_interval=3D3 onoff_holdoff=3D30 torture_type=3D= 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 I will start to debug this now. John Ogness --===============4927472901388232857==--