Thanks for the report.
The failure are the following lines:
+ extlinux --install /boot/extlinux\ /boot/extlinux is device /dev/mapper/loop0p1\ /tmp/in_target.d/finalise.d/50-bootloader: line 18: 31100 Segmentation fault (core dumped) extlinux --install $EXTDIR\
(The failing umount logs looks like a follow up error.)
Thanks for the report.
The failure are the following lines:
+ extlinux --install /boot/extlinux\ loop0p1\ target. d/finalise. d/50-bootloader : line 18: 31100 Segmentation fault (core dumped) extlinux --install $EXTDIR\
/boot/extlinux is device /dev/mapper/
/tmp/in_
(The failing umount logs looks like a follow up error.)