5.99.64 -current on amd64 fails to get to single-user

[Paul Goyette <paul%whooppee.com@localhost>]

I just built a brand new kernel and modules from sources updated about 
30 minutes ago.  When booting the system, it got all the way to the

        Enter pathname of shell or RETURN for /bin/sh:

prompt and then does nothing.  A PS2 keyboard "works" (meaning that 
pressing Enter on the keyboard does cause the console text to scroll). 
But a USB keyboard does nothing.  Also, unplugging the USB keyboard or 
mouse does not result in any "device detached" message.

An earlier 5.99.63 system was working just fine on this same hardware 
and with the same kernel config file.




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