Let's move this back to the bug list. Thanks for the debugging traces. I didn't see any smoking gun, but there're things I'd like to follow-up on to isolate the issue and then to hopefully allow me to reproduce it.
1. You have a customized gtk configuration that uses a theme no longer in Debian. Can you please try to rename your ~/.gtkrc-2.0 file to something else to see if that makes the crash go away? I'm guessing this doesn't matter, but checking would be good. 2. The crash makes me suspect that something related to graphics is at fault. You have a radeon graphics card of some sort it looks like, which could explain why I can't reproduce (my hardware is different). How old/new is your graphics drivers? Can you try to run pcb without hardware acceleration? You can do this with LIBGL_ALWAYS_SOFTWARE=true pcb-gtk Also please try LIBGL_ALWAYS_INDIRECT=true pcb-gtk Hopefully one of these resolves the crash, which would tell us where to look next. Thanks!