Hello Ronny, sorry for the delay. You wrote you recompiled - then I guess your build directory should also contain the libcups2-dbgsym and cups-daemon-dbgsym packages.
If you still get this crash, could you install these dbgsym packages from your build and recreate that backtrace in coredumpctl? A 'bt full' could contain some details too. Otherwise running cupsd within valgrind could also give some hints. This bug might describe the same issue, unfortunately also without solution: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1846334 https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1826648 https://marc.info/?l=openbsd-ports&m=157331902608071&w=2 Kind regards, Bernhard https://sources.debian.org/src/cups/2.3.3-2/cups/ipp.c/#L1729 https://sources.debian.org/src/cups/2.3.3-2/scheduler/client.c/#L2244