10.5.3 puts processes into "Uninterruptible wait" (U) state.

Umm. I have a MacBook and a PowerMac G4/400 AGP.
I never had any noticeable problems with either.
I've had the G4 since Q3 2001 and the MacBook since October 2007.
Since I updated to 10.5.3 I experienced processes dropping into the U state, which seems to be pretty bad and I'm not sure I've ever had this happen on Mac OS X or Linux (D state is Linux equivalent) in all my years of experience. Basically, it's impossible to kill the process even with "kill -9" and the computer won't shut down cleanly and I have to hold down the power button to stop the computer.
This has only happened with programs that are heavy on disk I/O such as web browsers that use lots of files for cache (Firefox, not Safari), rsync, and make jobs.
My MacBook only has one non-apple kernel extension (logitech mouse) and the G4 has none installed so this likely isn't anyone's fault but the OS and hardware vendor's.
Is anyone else suffering from this or does anyone know if there's something wrong with me?

I've experienced this problem some more.
This time it has happened to two different processes.
If I run "ps ax | grep -E ' U'" right now I get:
27 ?? Us 0:13.49 /usr/sbin/update
1677 s000 U+ 0:01.79 svn up
I've sampled the processes and subversion is hanging on a call to "open$UNIX2003" and update is hanging on a call to "sync".

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