linux-kernel - Re: Strange output on the console

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Message-ID: <20220225085332.5f92acf3@gandalf.local.home>
Date:   Fri, 25 Feb 2022 08:53:32 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Willy Tarreau' <w@....eu>, LKML <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        "Sergey Senozhatsky" <senozhatsky@...omium.org>,
        John Ogness <john.ogness@...utronix.de>
Subject: Re: Strange output on the console

On Fri, 25 Feb 2022 11:11:49 +0000
David Laight <David.Laight@...LAB.COM> 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 <gregkh@...uxfoundation.org>
Date:   Wed Jan 26 14:33:58 2022 +0100

    Revert "tty: serial: Use fifo in 8250 console driver"


-- Steve