After the last message here, the "echo", Call Trace, RIP and register
messages were repeated exactly as above.  At this point I did a hard
reboot.  A web search found something similar to the above output
("System hangs (bad RIP value) when disk used in pool is removed"), but
didn't otherwise seem to be related to the problem I'm having.

Do you still want me to check whether removing the iwlwifi driver makes
a differece?  And with the CDROM still detached, or does that not
matter?

Steve Berman