you can make 'mkudffs' segv trivially with the following: dd if=/dev/zero of=tst_udf bs=1024k count=8 mkudffs --media-type=dvd tst_udf it's a simple endian issue, fixed in community cvs: http://cvs.sourceforge.net/viewcvs.py/linux-udf/udftools/mkudffs/mkudffs.c?r1=1.3&r2=1.4&diff_format=u (reported as ppc since that's where I found it, applies to all big endian platforms.)
In portage, thanks!