Based on in-depth analysis, I found the cause of the error：
“Apr 03 12:59:15 ubuntu systemd[1]: Failed to set up mount unit: Device
or resource busy”
call tree on systemd mount.c & unit.c:
mount_dispatch_io
-> mount_load_proc_self_mountinfo
-> mount_setup_unit
-> mount_setup_existing_unit
-> mount_add_extras
-> unit_set_default_slice:
-> unit_set_slice:
if (unit_active_state(u) != UNIT_INACTIVE)
return -EBUSY;
"unit_set_slice" return EBUSY always, because of nfsroot always active
state in netbooting,
"mount_dispatch_io" give up updating mount state when
"mount_load_proc_self_mountinfo" return the error.
finally, all systemd mount service failed and then goto emergency shell.
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https://bugs.launchpad.net/bugs/1755863
Title:
netbooting the bionic live CD over NFS goes straight to maintenance
mode :
Status in casper package in Ubuntu:
Confirmed
Status in systemd package in Ubuntu:
Confirmed
Bug description:
netbooting the bionic live CD[1] over NFS goes straight to maintenance
mode :
[1] http://cdimage.ubuntu.com/daily-live/current/
# casper.log
Begin: Adding live session user... ... dbus-daemon[568]: [session uid=999
pid=568] Activating service name='org.gtk.vfs.Daemon' requested by ':1.0'
(uid=999 pid=569 comm="" label="unconfined")
dbus-daemon[568]: [session uid=999 pid=568] Successfully activated service
'org.gtk.vfs.Daemon'
dbus-daemon[568]: [session uid=999 pid=568] Activating service
name='org.gtk.vfs.Metadata' requested by ':1.0' (uid=999 pid=569 comm=""
label="unconfined")
fuse: device not found, try 'modprobe fuse' first
dbus-daemon[568]: [session uid=999 pid=568] Successfully activated service
'org.gtk.vfs.Metadata'
(gvfsd-metadata:580): GUdev-CRITICAL **: 16:28:56.270:
g_udev_device_has_property: assertion 'G_UDEV_IS_DEVICE (device)'
failed
(gvfsd-metadata:580): GUdev-CRITICAL **: 16:28:56.270:
g_udev_device_has_property: assertion 'G_UDEV_IS_DEVICE (device)' failed
A connection to the bus can't be made
done.
Begin: Setting up init... ... done.
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