gdbui hang

[Miles Bader]

Sometimes (well, actually fairly often) the new fancy gdb mode hangs in
a way that can't be interrupted, e.g.:

   ...
   Program exited normally.
   (gdb) break poc_startup
   Function "poc_startup" not defined.
   Make breakpoint pending on future shared library load? (y or [n]) n

     C-c C-c  C-c C-c  C-c C-c  C-c C-c  C-c C-c  C-c C-c  C-c C-c

I'm not sure what other info is useful to debug this.

[A related problem is that if I kill the *gud-foo* buffer to try and
recover from the hang, and then start another gdb process, it will often
fail to work, saying `selecting deleted buffer' in a command I give.  In
general it's a good idea to recover gracefully if a buffer is deleted;
the gdb mode probably shouldn't be keeping any session state outside of
the gdb buffer itself -- i.e., try to make any state variables
buffer-local in the gdb session buffer.]

-Miles
-- 
Run away!  Run away!