[2016-07-01 09:51:08] lb_binary_rootfs 
P: Begin building root filesystem image...
0+0 records in
0+0 records out
0 bytes copied, 3.7116e-05 s, 0.0 kB/s
mke2fs 1.43.1 (08-Jun-2016)
ext2fs_check_if_mount: Can't check if filesystem is mounted due to missing mtab file while determining whether binary/boot/filesystem.ext4 is mounted.
Suggestion: Use Linux kernel >= 3.18 for improved stability of the metadata and journal checksum features.
Discarding device blocks:   4096/343040             done                            
Creating filesystem with 343040 4k blocks and 171600 inodes
Filesystem UUID: 43ff7fc9-12bb-4151-8549-77c8e1e35e2c
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912

Allocating group tables:  0/11     done                            
Writing inode tables:  0/11     done                            
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information:  0/11     done

mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
P: Begin unmounting filesystems...