[Bug 994749] [NEW] checkfs run on already mounted filesystem, preventing boot

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I had Ubuntu 10.04 LTS installed, now upgraded to 12.04 Precise.

When the system enters run state 'S', it attempts to fsck two mounted
file systems. This causes it to drop into a maintenance shell,
preventing other system services (sshd, etc. etc. ) from starting until
the maintenance is entered.

However, it does progress to running gdm and gives a prompt to login (X
is running on tty1 then).

Ctrl-Alt-F7 leads to the maintenance shell, exiting it makes the boot
complete.

/var/log/checkfs is
----------------------
Log of fsck -C -R -A -a 
Fri May  4 15:40:13 2012

fsck from util-linux 2.19.1
/dev/sda2 is mounted.  e2fsck: Cannot continue, aborting.

/dev/sda4 is mounted.  e2fsck: Cannot continue, aborting.

fsck died with exit status 8

Fri May  4 15:40:13 2012
----------------

My /etc/fstab:

proc            /proc           proc    nodev,noexec,nosuid 0       0
/dev/sda1       /               ext4    errors=remount-ro 0       1
/dev/sda2       /home           ext4    defaults        0       2
UUID=02e8ad70-9e55-41e3-85be-42d7edf07c5e /opt            ext4    defaults        0       2
/dev/sda3       none            swap    sw              0       0
/dev/sdb3       /media/gback    ext4    rw              0       0

(The device with UUID=02e... is /dev/sda4).

My question: how in the world can it happen that your checkfs.sh runs
'fsck -C -R -A -a' *apparently after* you've mounted all configured
filesystems read-write?  This would fail deterministically, as it does
for me. Clearly, something must be wrong with my installation, but what?
I did not make any changes to /etc/rc*/*

Any insights/hints for what I could try?

As is, I can't reboot the machine remotely because it never gets to
starting the network/sshd, which is highly annoying. I need to
physically exit the maintenance shell.

** Affects: util-linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: boot checkfs failure maintenance shell
-- 
checkfs run on already mounted filesystem, preventing boot
https://bugs.launchpad.net/bugs/994749
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