I've tested this with kernel 4.10-rc3 in a local VirtualBox VM (Ubuntu
Server 16.04), with the same fstab error as above, and am able to
confirm most of the symptoms described by the reporter.
When attempting to 'mount -a', it presents the expected "wrong
filesystem type" error, but doesn't render the system unresponsive.
Upon reboot, however, it drops into a maintenance console without
presenting an error about a failed mount attempt. Consequently, the
server would be unreachable for maintenance via SSH.
'journalctl -xb' provides a log that contains an error about the failed
mount attempt, but doesn't point to it as the reason for dropping into a
maintenance terminal, and it isn't the last thing logged.
After fixing fstab (which requires physical access) and rebooting
('reboot' from the maintenance console), GRUB does still have a
countdown, but it starts around 10 seconds, instead of 3 seconds (~3
seconds is the default for Ubuntu Server). Otherwise, at this point,
the system is able to boot up automatically, without issue.
After rebooting a second time (from the normal BASH prompt), the GRUB
countdown is back to ~3 seconds, and the system boots normally
(automatically), from there.
Thanks, again, for helping to resolve this bug.
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https://bugs.launchpad.net/bugs/1463120
Title:
Failure to boot if fstab disk mounts fail
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