Messages in this thread | | | Date | Fri, 10 Mar 2023 02:26:59 +0100 | Subject | Re: Bugzilla 217083 | From | Valerio Vanni <> |
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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.
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