I was following:
- https://dev.mysql.com/doc/refman/8.0/en/using-gdb-on-mysqld.html I
- https://dev.mysql.com/doc/refman/8.0/en/crashing.html

Which mostly comes down to:
$ apt source mysql-server-8.0
$ apt install gdb mysql-server-core-8.0-dbgsym libc6-dbg libstdc++6-dbgsym
$ sudo gdb /usr/sbin/mysqld
(gdb) run --skip-stack-trace --gdb --core-file --general-log --general-log-file 
--verbose --innodb-read-only --help --debug

To be clear - in a normal working environment that would not even start
the server for real - it would initialize a bit and then report on the
used and possible config options.

For comparison in a similar environment I'll also use 8.0.23-0ubuntu0.20.04.1 
in Focal.
Hoping that this might help to differentiate the noise from data.
But since things work there I'll need to find which function to break on ...

I'll attach an initial backtrace here ...

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https://bugs.launchpad.net/bugs/1915275

Title:
  mysql-8.0 regressed on riscv64 due to new glibc

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