On Sat, Jan 20, 2018 at 04:41:00PM +0800, Hongzhi, Song wrote: > > 329.11 EXT4-fs (nbd0): mounted filesystem with ordered data mode. Opts: > (null) > 329.12 block nbd0: Connection timed out > 329.13 block nbd0: shutting down sockets That's your problem. I'm guessing qemu-nbd is dying for some reason, which is causing the nbd device to fail (hence the "connection timed out"). - Ted