linux-kernel - Re: Bugzilla 217083

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Message-ID: <6b65e5dd-a940-a176-fa86-5c2babac805c@inwind.it>
Date:   Fri, 10 Mar 2023 02:26:59 +0100
From:   Valerio Vanni <valerio.vanni@...ind.it>
To:     Slade Watkins <srw@...dewatkins.net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Bugzilla 217083

Il 24/02/2023 19:06, Slade Watkins ha scritto:
 >> https://bugzilla.kernel.org/show_bug.cgi?id=217083
 >>
 >> I got this error after upgrading a Debian machine (x86-64) from Stretch
 >> to Buster. Upgrade is successful, but the next boot it crashes.
 >
 > Thanks for the details. What was the last known good kernel version
 > that did not exhibit this issue on your system?

I updated bugzilla and I update also here.

I use serial console to collect diagnostic data, but now I've found that 
it misses lines.
In kernel boot line I put "console=ttyS0 console=tty0" so I get both 
local and serial console.

But the issue is: tty0 shows more messages. Is there a way to get 
everything also on ttyS0? It would be useful, since you cant' scroll 
tty0 after a kernel panic.

When kernel loads, tty0 scrolls very fast. I could see some more line 
but wasn't able to read them.
The only way I found was adding a (slow) speed to ttyS0, 
"console=ttyS0,1200" on kernel boot line.
This slowed down ttyS0, and tty0 was forced to go at the same pace.

So I could read a line (only on tty0), between "Run /sbin/init as init 
process" and start of kernel panic.
That line complained that it could not find something in /usr/lib/.... 
At that stage, /usr was not mounted yet.

Then I restored full disk image on the machine, an before upgrading from 
stretch to buster I merged / and /usr, so that /usr/lib/... was 
available from / mount.

After that, kernel panic did not show anymore.