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[2620:137:e000::1:20]) by mx.google.com with ESMTP id a9-20020a634d09000000b0036c8e54e2ebsi1862086pgb.147.2022.02.25.06.07.48; Fri, 25 Feb 2022 06:08:05 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=m4Vfck2W; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237594AbiBYJiR (ORCPT + 99 others); Fri, 25 Feb 2022 04:38:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36880 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234665AbiBYJiP (ORCPT ); Fri, 25 Feb 2022 04:38:15 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E92A622BD64 for ; Fri, 25 Feb 2022 01:37:43 -0800 (PST) From: John Ogness DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1645781861; 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=X7clqAVqcVNCOSSAPXmaeOBIZw4MCC68xC/iDFtYSF8=; b=m4Vfck2Wgjt8EMvdJksQ26y6sCVsRW95f/IMtkzxahJ6CYgrZOu4mJ1KXI0/imJH6rOGa3 NdLRFfIENwRLeA0sDhrou6KbISZilWPAuY2Cac+Y1+FJHV7pFNIOJ4V/dTYaDLTdaXJAQE FzIyBT+T44Lx0D/894uYdgnErPDltLuc/24tOqdHbku1w25Bx5y7HTCzlk7ncPTfTon8L/ dv/WglaDym9FZqmNM0+9SRsaIc1/7VIX37Ve6YAkyrmOqFZNgr8ZRkdCsdwjpmhy8vyWvH pJbM1U6gJl6ueYhEOpXALgqPntx49uDgjnox7dY6hxLohqYRzIJfHeYIOhF1lg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1645781861; 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=X7clqAVqcVNCOSSAPXmaeOBIZw4MCC68xC/iDFtYSF8=; b=7g68RAB/qCu3aGEhiCQWzWKIqHRYM0w8Te6KAReINx+ZnuDeO6ANEqqyxVQ/Ld1rK+GUbG VHzVSCi+78NzQ6Dw== To: Willy Tarreau , David Laight Cc: 'Steven Rostedt' , LKML , Petr Mladek , Sergey Senozhatsky Subject: Re: Strange output on the console In-Reply-To: <20220225063637.GA18039@1wt.eu> References: <20220224230035.36547137@gandalf.local.home> <61226fc12ff9459d8daed8e346d6ab94@AcuMS.aculab.com> <20220225063637.GA18039@1wt.eu> Date: Fri, 25 Feb 2022 10:43:40 +0106 Message-ID: <878rtzwal7.fsf@jogness.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,INVALID_DATE_TZ_ABSURD, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Steven, On 2022-02-25, Willy Tarreau wrote: >> > And it always seems to happen right after: >> > >> > Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled >> > >> > Maybe this is a serial issue and not a printk one? :-/ Your first message says you attached a dmesg. Does this mean you dumped the kernel log directly into the attached file? ...or was that a screen capture in the attached file? It is an important distinction because if garbage is landing in the kernel buffer, it is not related to serial at all. John