Description:

After rebooting my server system after today's pacman -Syu, file systems from /etc/fstab didn't get mounted. (Tried multiple times, but still the same result.) The root filesystem was remounted rw as usual.

Other symptoms of this problem:
* /etc/mtab is obviously outdated after each reboot, listing the mounts that existed prior to the reboot. But the root filesystem is remounted rw normally, so there's no reason why /etc/mtab should remain "frozen".
* /proc/mounts shows that only the root (/) filesystem is mounted, whereas /home, /var and /var/log are not.
* Mounting all the file systems manually works perfectly fine -- no error messages, no issues, standard mout messages in dmesg.

Additional info:
* I use a *vanilla* kernel (3.2.16) with a standard mkinitcpio-generated image.
* The system has worked with exactly the same /etc/fstab for >1 year and it always booted just fine.
* All the file systems are on software RAID + LVM. (Could this be a weird udev issue...?)

* package version(s)
filesystem 2012.2-4
initscripts 2012.03.2-1
udev 182-1
mdadm 3.2.3-1
lvm2 2.02.95-1
mkinitcpio 0.8.7-2

* config and/or log files etc.
Since /var/log was not mounted, none of the daemons started properly and I don't have any meaningful logs. (Can't reboot the server all the time and experiment, unfortunately...)
There was nothing suspicious in dmesg, no failures at all.

/etc/fstab and /etc/mdadm.conf are attached. (It's good to use :set ts=4 or the like when reading fstab.)

Steps to reproduce:
Dunno. This might be related to the specific configuration of this machine. The attachments contain the configuration that might reproduce the problem.