It seems to me that indeed akonadiserver is the culprit. I kept kontact
running and only stopped akonadiserver, killed mariadb and resarted
akonadiserver. Then kontact started to work again.
More info: I suspect that this is due to a deadlock in the db updates,
akonadiserver even logs this:
Note that my previous message on https://bugs.debian.org/cgi-bin/
bugreport.cgi?bug=1010576 is incomplete, please see the referenced Message
Part 2 (https://bugs.debian.org/cgi-bin/bugreport.cgi?
att=1;bug=1010576;msg=25) for the full contents.
I collected some information that might help with debugging, unfortunately some
output uses
German localization, I can translate these if needed:
In the shell where I started akonadi with akonadictl start, I got this output
(many
lines duplicated and removed for brevity):
"Das Objekt
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