kcrash either lets the application crash as normal and get processed by the system's coredump handler or starts drkonqi for "JIT" debugging. However, if systemd is used but systemd-coreump is not installed, neither of that happens. This is because systemd leaves kernel.core_pattern="|/bin/false" (https://github.com/systemd/systemd/blob/main/docs/COREDUMP.md) so kcrash thinks there is a handler but there isn't really. I'm not sure whether this should be treated as "no handler installed" by kcrash. Arguably this configuration can also mean that the user doesn't want to handle crashes at all, so drkonqi shouldn't be launched at all.