Kernel panic at shut down I recently upgraded my MacBook Pro from 10.6.8 to 10.7 (and now 7.1 &amp; 7.2).

Ever since the switch to Lion my Mac has a kernel panic at shutdown and I get the "You need to restart your computer" error message.

I've reset the PRAM and SMC but that made no difference. Booting in safe mode didn't help either. I also unplugged everything from the Mac (monitor, keyboard, mouse, etc.) but it still kernel panics.

Here are a couple logs with peripherals attached and without.

How can I prevent this shut down kernel panic?
Both panic logs indicate the panic happened in the org.openafs.filesystems.afs extension, so that's the logical suspect.  The OpenAFS page for Mac OS X seems to indicate that version 1.6.0 is current, and lists separate installs for different versions of OS X. Your panic logs indicate you have 1.6.0fc7, which is presumably a final candidate, not the actual release.  I'd disable the extension first, then try installing the current Lion version.