[opensuse] Unclean shutdowns in 10.3

I recently upgraded to 10.3 from 10.0 on a Sony Vaio PCG V505DP
laptop. My 10.0 setup was very stable, but I am experiencing a serious
problem in 10.3 with unclean shutdowns. Every so often (once in 5
times, maybe) my KDE refuses to shut down - some windows, like KNotes,
stay on screen, but nothing happens. My keyboard works, so I can
switch to text console, manually kill all processes and then re-boot
with ctrl-alt-del or reboot. However, the system refuses to shut down
cleanly. It goes through all the normal stages without any error
messages, gets to the point of unmounting the file systems and then
goes

oops - cannot umount /: device or resource busy

And then it halts immediately. When I run it again, there is always a
ton of transactions to be replayed (I am using ReiserFS).

I looked through /var/log/messages and /var/log/XFree86.0.log, but
neither seems to have any error messages. I checked my hardware status
with smartctl, and it reports being fine. How could I begin to trace
this?

Myrosia
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