Do you see any crash message on the screen, even briefly? If so, you can append panic=0 to vmlinuz options and/or noreboot to xen options to keep the message longer on the screen. Or at least better see what is the last message before the crash…
You said the last line is about modprobe configfs. Can you check in a log from earlier boot what was the next module loaded? And maybe try to exclude it?
There is also a hope crash message got saved to efi pstore. Check /var/lib/systemd/pstore and /sys/fs/pstore after booting to older kernel.
Was there any issue reported earlier about this kernel version?