Read-Only Problem during Boot

Hi,
I tried to update my system today, like every week, with the standard command pacman -Syu. After installing all updates, my window manager (gnome3) crashed and i tried to restart my System. After the grub window appeared and I choosed my kernel the normal startup commands are shown until the Arch prompt appeared. The one where Arch Linux tried to start all relevant processes. After that there are only mistakes. All startup processes are busy or failing. The only message i get is, that the filesystem, i think thats the root partition (ext4), is read-only or another error: some files for startup cannot be created because they already exist.
Getting to console is also impossible, because the system tries to start virtualbox additions, with an funny message, that it is busy and tries it again in 5 min (infinity loop). But shidt happens. I have read in another post that I can try another Linux System, mount my root partition and do an
fsck /dev/sda3 -p or -f
. But it says that all is clean (sda3 is root and sda1 is /boot). The filesystem is ext4, so i tried also fsck.ext4, but it also say all is clean.
After another boot i stoped at the position, where the fist error occur.
Mounting Local Filesystems
/etc/rc.sysinit: line 285: /etc/mtab: Read-only file System
next one:
Activating Swap
/bin/rm: cannot remove '/etc/localtime': Read-only file system
removing leftover Files
/usr/bin/find: cannot delete 'var/run/cups.pid': Read-only file system
After that message there are also al lot of analog errors.
I have no other idea than an dirty filesystem. Is there another possibility to rescue my system without an fresh install. Im sorry but i cannot log any messages at that state of boot. So it is not easy to get better informations about special error codes.
I have forget to give you some informations about my stats:
- actual stable arch kernel 2.6.38
- gnome 3
- thinkpad t400
Last edited by Psikon (2011-05-13 20:18:12)

With udev 168-1 I obtain this message during boot:
:: checking filesystems
fsck.ext4: no such file or directory while trying to open /dev/sda6 (my root device)
Possibly non-existent device?
***************** FILESYSTEM CHECK FAILED ****************
* Please repair manually and reboot. Note that the root *
* file system is currently mounted read-only. To remount *
* it read-write type: mount -n -o remount,rw / *
* When you exit the maintenance shell the system will *
* reboot automatically. *
but fsck run manually says it's all clean.
I have to remount rw / partition and manually mount all the other partition, then I can switch to runlevel 3.
With udev 167-2 (and prior) I can boot without any problems.
I'm not sure it's a problem from udev, but downgrading it works for me.

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