linux-kernel - Strange output on the console

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Date:   Thu, 24 Feb 2022 23:00:35 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        John Ogness <john.ogness@...utronix.de>
Subject: Strange output on the console

I've been noticing that my tests have been spitting out strange output on
the console. It would happen at boot up and then clear up. It looks like
something screwed up with the serial timing.

Attached is a dmesg of one of my test runs as an example.

I've noticed this on both 32 bit and 64 bit x86.

I haven't had time to look deeper into this, but I figured I let you know
about it.

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? :-/

-- Steve

View attachment "strange.txt" of type "text/plain" (53866 bytes)