Received: by 2002:a05:6a10:9afc:0:0:0:0 with SMTP id t28csp335119pxm; Fri, 25 Feb 2022 08:53:49 -0800 (PST) X-Google-Smtp-Source: ABdhPJzBATpVmZzhaZ7/GqQ32potJDZEwLutSDZuPEwyL/y/ZjRItr6mBawcLc/0vL+l4OEnM0PW X-Received: by 2002:aa7:820b:0:b0:4f1:2d08:5e90 with SMTP id k11-20020aa7820b000000b004f12d085e90mr2441474pfi.31.1645808028835; Fri, 25 Feb 2022 08:53:48 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1645808028; cv=none; d=google.com; s=arc-20160816; b=zIebdZPkWp1aQYlYtTN5tCxxTAUHQjXfSvizVauXl7ST+eFxlVOLZYUG5VadB2sCn6 TpOzKbmymoiUm3Jt7mjPNtdrtKZsPdUPVndk3juSp18EuYJ+z0yD84j5DhiNcKp/jQ9n z046xkXvxE52qjGVjlrk7dlb6uS66ec799saO6eWxW00h96imLWzIRi9XFKpdy9Hrwun k44hhpOB49XwN9FRa3HUoMPPQPEAqv4h5BMAH87KgT8w+cO4IF2p1k8D1xdKNBjrUaw2 x3fsHs4cKjaP5BVsJruSFAL2qHdd1MFPhwQtV9zpe+vt1KsKz3qsvoRSohcJH9gFY5/V JVmg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date; bh=6tVccIFbR9QlYsOgufUO+mQT3JbNkHzTVCwzY556NxE=; b=C1qG5+46YXI7P/nxnBTRTeJ1Ifituuac22cAoCIk8vHhpWkukdB6f2VaF8Ryvhwy8d l271w8C9RbaQ94xCiD5rfCnZNLJUYKKqWi8M9psfar4gvCmFzGWGwYnWexaab+3B+GBU oUSk5C1bZHx0yVkZ7Ko23K4d43kLPPlOirA1qcM0lmkftJnhvBxSPtXBt5hcdFEZY8sC 0WvJvLauiwZd8qlWrr9z+zKjdXMawDrktvX/wzz+/tvCrp9Zvlf8eeksIRExM+tNUUsI EGilTczfri+mOB3X02N6tAct4W/iQSRO9SDfGXs1A7MAaueRHM332Z4dgfFyKHmkOIgX +M6Q== ARC-Authentication-Results: i=1; mx.google.com; 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 Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id c1-20020a170902d48100b0014c81326900si2304359plg.268.2022.02.25.08.53.32; Fri, 25 Feb 2022 08:53:48 -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; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237498AbiBYNyL (ORCPT + 99 others); Fri, 25 Feb 2022 08:54:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230078AbiBYNyJ (ORCPT ); Fri, 25 Feb 2022 08:54:09 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B66C81A8C8F for ; Fri, 25 Feb 2022 05:53:37 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 6E85AB831D4 for ; Fri, 25 Feb 2022 13:53:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A031C340E7; Fri, 25 Feb 2022 13:53:34 +0000 (UTC) Date: Fri, 25 Feb 2022 08:53:32 -0500 From: Steven Rostedt To: David Laight Cc: 'Willy Tarreau' , LKML , Petr Mladek , "Sergey Senozhatsky" , John Ogness Subject: Re: Strange output on the console Message-ID: <20220225085332.5f92acf3@gandalf.local.home> In-Reply-To: <32a7af26f4494f47a03a6d965ac7c99a@AcuMS.aculab.com> References: <20220224230035.36547137@gandalf.local.home> <61226fc12ff9459d8daed8e346d6ab94@AcuMS.aculab.com> <20220225063637.GA18039@1wt.eu> <1dcb185901f04a5ea2476a449e371167@AcuMS.aculab.com> <20220225103239.GA18720@1wt.eu> <32a7af26f4494f47a03a6d965ac7c99a@AcuMS.aculab.com> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-6.7 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_HI,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 On Fri, 25 Feb 2022 11:11:49 +0000 David Laight wrote: > TntiTet_TetkT t:TetyTvt:TntaTttTet TeteTvtnTntnTvtnT teT teTettTettKTeteTttnTnteTttaTttaTetKTttOTet:TvtnTvtltTntw Tnt:T tOTvt_Tnt:TvtKTntnT tsTvtsTttsTttsTttosTvtotTtt:TntrTntOTet T ttTvtKT tKT teTnttTettTntaTntdTttaT taTeteT tTtt TttrTntlTvt:TetkT tTtttTnteTttOTetkTvtsTeteT tlTttoTntoTetpTvtpTetsTvtvTvteTntOTet > TttTetsTetsTntsTetKT t TttiTttT tnT tOTnt_TttrTtttTntKTetOTtteTnt:T tKTttpTvdoT dxTvdnTtd TedtTedoTvdiTedaTedT d Ttd:TedtTtd TeddTvdKTediTndgTednTtdgTtd TedKT snTesTtsOTesKTnstTvsOTvsTnsKTvs:Tts:TesTvs:Tns Tes T sdTts TtsoTesOTtslTesnTesKTesOTns > TnsTesOT s T sKTesOT sKTvsOTtsTtsKTtsT sKTesTesKT sKTesOT siT stTnsaTvsaTesKTnsOT s > TesKTnsT s TvsKTeslT sOTesT sKTtseTnseTvs_Tts_T sOTes TnsOT s T spTespTesdTesdTeseTtseTeseTt_rTe_rTv_oTes:T s:Tes:TnfwOTvfrKT fwT frTefpuTefpKTefpTvf:TnsOTvsOTnsoTvs Tvs TvsTtssTnsT sKTesTnsTvsTtsoTesmTnsgTesiTeslTtsTvsKTnsTvsOTtsT s_Tnsu > > which really doesn't have enough different characters in it to be a fifo problem. > That looks like a UART struggling to find valid start and stop bits > on a continuous data stream that doesn't match the baud rate. The output was misleading as a lot of the characters were overwritten due to the backspace character being one of the characters that were outputted. Anyway, it looks to have been a fifo issue considering the problem goes away after applying: commit 6a7b9f002eca6788d346c16a6ff0c218b41f8d1d Author: Greg Kroah-Hartman Date: Wed Jan 26 14:33:58 2022 +0100 Revert "tty: serial: Use fifo in 8250 console driver" -- Steve