SUMMARY It has happened to me several times that starting up Kalendar would show an empty UI - no calendars, no events, nothing. Closing Kalendar and then opening it again would result in a crash. I noticed that opening KOrganizer appears to fix things: KOrganizer starts with no events shown, but in a couple of seconds everything is back to normal; at this point it is safe to open Kalendar, which stops crashing but shows no events as all the calendars are deselected and have to be manually selected again. I also noticed that, alternatively to opening KOrganizer, one can run "akonadictl restart" for Kalendar to start working again. These two facts together appear to indicate that there is something going on in Akonadi which is not managed correctly in Kalendar and which therefore leads to it crashing. It has to be noted that Kalendar is the only software to suffer from these crashes, as all other applications and widgets that make use of Akonadi show no issues. It is also far from clear what the conditions are to reproduce this, as it happens seemingly at random times. STEPS TO REPRODUCE 1. ? OBSERVED RESULT Kalendar shows an empty UI and then crashes. EXPECTED RESULT Kalendar works normally. SOFTWARE/OS VERSIONS Linux: KDE neon KDE Plasma Version: 5.27.5 KDE Frameworks Version: 5.105.0 Qt Version: 5.15.9 ADDITIONAL INFORMATION
Just a small update to the report: this is now reproducible every single time that I try to open Kalendar. In fact, it seems like Kalendar won't be able to start at all unless I manually restart Akonadi beforehand every time.