This bug is particularly troublesome because it is so difficult to
debug; I spent hours trying to work out what was wrong. The fact
mountall looks like a daemon that should continue running doesn't help
(it is run as "mountall --daemon"). The fact there is no man page
doesn't help either. You are suppose to know to use "mountall --help".
Anyway if you run mountall in verbose mode ("mountall -v" from memory)
you see it complain that it can't mount cgroup because it is already
mounted. I think as a result it hangs and prevents the system from
booting, without logging any messages or showing any messages to the
user.
For the record in my /etc/fstab I had:
cgroup /var/cgroup cgroup defaults 0 0
This was required in earlier Ubuntu releases because Ubuntu didn't mount
the filesystem itself.
Brian May
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https://bugs.launchpad.net/bugs/874989
Title:
cgroup mount point in fstab causes boot process to hang
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