[    7.434395] blkfront: xvda: empty write barrier op failed
[    7.434398] blkfront: xvda: barriers disabled
[    7.462027] EXT4-fs (xvda1): re-mounted. Opts: errors=remount-ro,commit=0
[    8.107988] EXT4-fs (xvda1): re-mounted. Opts: errors=remount-ro,commit=0
[   17.440028] eth0: no IPv6 routers present
[   19.009785] ISO 9660 Extensions: Microsoft Joliet Level 3