We've triaged this on #ubuntu-devel today, the problem is that the
kernel doesn't pass the device specified by root= to userspace, e.g. by
naming it in /proc/self/mountinfo, and instead passes /dev/root.
mountall will wait for that device to appear, which it never does,
because nothing creates it.
(The kernel doesn't create it in devtmpfs either)
The right fix would be to have udev create /dev/root as a symlink to the
device named by MAJOR:MINOR in /proc/self/mountinfo - it makes most
sense for this to be a dynamic rule written out by mountall, since it
has parsed mountall
We'll need to make sure it's written to /dev/.udev/rules.d - and not
written until /dev is actually mounted/remounted (before emitting
virtual-filesystems seems like a good place)
** Changed in: mountall (Ubuntu)
Milestone: None => ubuntu-10.04-beta-1
** Changed in: mountall (Ubuntu)
Importance: Low => Medium
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Boot hangs waiting for local filesystems if / isn't in fstab and / is only
mounted ro
https://bugs.launchpad.net/bugs/527216
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