WindowServer process stuck in uniterruptible wait

This is a continuation of
http://discussions.apple.com/thread.jspa?messageID=10330558
This continues to happen on a fairly regular basis. I can't make it happen at will, but it seems to happen anywhere from every couple days to every couple weeks. It's happening now:
$ ps ax|grep WindowServer
75 ?? Us 38:12.86 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphic s.framework/Resources/WindowServer -daemon
I am getting that via ssh session as the OSX UI is obviously frozen (The "Us" in the ps output above is the process state. The "U" is saying the process is stuck in uninterruptible wait, meaning its frozen until whatever it's waiting for comes back. I cant kill it even with -9). It would be cool if there were some sort of troubleshooting steps I could take to gather data to try to pinpoint why this is happening. Any suggestions?

Exactly the same thing happens to quite frequently since update to SL (10.6.1), it happend from time to time even on Leopard but much less frequently. I can still login to the machine over ssh, three processes are usually marked as stuck- WinowServer, loginwindow, mds. I can restart the machine more gracefully using sudo -r now instead of holding the on/off button. This is very annoying when my machine freezes at least once every day I use it. I suspect this may be related to HW issues with overheating CPU and GPU after SL upgrade my machine runs significantly hotter than with 10.5.x (5-10 degrees) I red that many other people experienced increased temperatures after upgrade. I'm looking for some help with this issue, it is hard to say if this is HW or SW problem. Unfortunately my mac extended warranty expired couple moths ago so I doubt that "Genius" visit at apple store would do any help. They would probably just advice to make clean install which I wanted to avoid this time. I did little bit of research on Google but I did not found any decent advice how to increase stability of the system on SL. It seems that many people experienced the same issue with various models and OSX versions (different GPUs) before so it looks more like SW drivers issue. Can anyone at Apple address this apparently relatively frequent issue?
Message was edited by: quirky
BTW there is way too many people having similar problems
http://discussions.apple.com/thread.jspa?messageID=10036049&#10036049

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