There is a very similar backtrace attached to a bug report on the Ubuntu Launchpad: https://bugs.launchpad.net/kicad/+bug/911963 in particular comment #5 and https://bugs.launchpad.net/kicad/+bug/911963/+attachment/2671141/+files/Xorg.gdblog.4975 For what it's worth, that reporter also uses intel drivers.