Can't boot after system update: unknown filesystem type

After running a system update, including updating the kernel, I can't boot to the new kernel.
On booting, grub loads the kernel image, runs/loads udev, but then fails to mount the root partition with error:
mount: unknown filesystem type 'ext4'
I have tried reinstalling the 'linux' package via packman several times, also trying the --recursive argument to make sure all my dependencies were there, and after days of googling and tweaking my system, I'm at a loss.
Thank goodness I happened to keep a spare kernel laying around in /boot.
Thanks in advance.
Last edited by jackrabbit (2012-03-22 23:25:28)

The OP can read their partition initially though, it's only after udev that they can't.
Also, try adding "rootfstype=ext4" to your grub kernel line. Is your /boot on a separate partition or part of your / partition?

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