[debian-mysql] Bug#900398: mariadb-server-10.1: postinst fails since official rebuild

[Faustin Lammler]

Paul,

> my guess is that the DB crashed so the 'tc.log' file was created and it
> prevent the mariadb-server to start again.
After a discussion with Elena Stepanova, here is some information on the
'tc.log' file:
	[...] tc.log wouldn't prevent mariadb from starting, it's there
	to help, not to obstruct. It's more likely that the tc.log is
	invalid on whatever reason (e.g. got corrupt due to a disk
	problem or lack of space, or as a result of a bug in the
	previous installation, or is of an incompatible format). You can
	very easily get the same effect if you stop the server, run
	touch <datadir>/tc.log (assuming you don't have one) and then
	try to start the server.

Documentation on how this 'tc.log' file work is quite inexistent because:
	[...] it has never been meaningfully documented, neither in
	MariaDB nor in MySQL. Hopefully it will change soon [...].

There is a documentation request filed on https://jira.mariadb.org/browse/MDEV-16442

So regarding our issue, I guess that the DB crashed or the tc.log file
got corrupt (or both).

Do you know how to reproduce this? Do you have any steps that I could
try?

-- 
Faustin Lammler
MariaDB Foundation