Multiple akonaid-related processes crash on session startup, with similar backtraces I suspect https://invent.kde.org/pim/akonadi/-/commit/b5a23bfe2c6bdc44b3f4eede4eac0a66050e095e or some other recent commit to be the culprit. KDE stuf is built from master, Qt from 5.15 branch
Created attachment 129050 [details] kalarm_resource bt
Created attachment 129051 [details] imap resource bt
Created attachment 129052 [details] archive mail bt
seems fixed