I modified lookup() to print the action type (create, delete,
rename, lookup) as well as the path name that it was working
on.  Here are the last things it does:

<lots of lookups up to the top of the screen>
lookup /home/src/distrib/alpha/floppy
lookup src/
lookup /home/src/
delete src/
delete /home/src/
lookup src/ <-- this is the one that caused the inode-lock panic.

  It appears /home/src/distrib/alpha/floppy has since been
removed from the distribution since my last successful sup, but
that shouldn't cause a panic.

  I'm clueless about kernel internals, so any further debugging
is probably out of my league without assistance.

  Brian