James Robinson <[EMAIL PROTECTED]> writes:
> As fate would have it, the vacuumdb frontend and backend which were  
> initially afflicted are still in existence:

OK, so pid 19244 isn't blocked on any lmgr lock; else we'd see an entry
with granted = f for it in pg_locks.  It could be blocked on a lower
level lock though.  Can you attach to that PID with gdb and get a stack
trace?  Something like (as postgres user)

        gdb /path/to/postgres-executable 19244
        gdb> bt
        gdb> quit
        ok to detach? yes

                        regards, tom lane

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