tty problems in recent head?

[Giorgos Keramidas]

I just restored my laptop after a bit of 'fun' with a broken disk, and
rebuilt all my ports.  Something in head/ @ svn rev 185370 seems to
cause problems to screen & xterm.

Exiting an xterm window causes xterm processes to be stuck in 'RUN' and
consume a lot of CPU:

  PID USERNAME    THR PRI NICE   SIZE    RES STATE  C    TIME    CPU  COMMAND
11211 keramida      1 106    0  7624K  4360K CPU0    0   0:46 51.86%  xterm
11169 keramida      1 106    0  7624K  4504K RUN     1   1:12 49.66%  xterm
11201 keramida      1 106    0  7624K  4360K RUN     1   0:47 49.07%  xterm
11180 keramida      1 106    0  7624K  4360K RUN     1   1:07 48.88%  xterm
...