Description of problem:

This weird problem started happening with 3.0-38 and is still in 3.0-40 :

When sent the SIGHUP signal, bash does not exit until another command is typed
and return is pressed. 

This prevents xterm running a bash process from exiting, as it sends its
child bash process a SIGHUP signal, and then waits for the SIGCHLD from 
the exited child before exiting .

When the bash child process has been sent a SIGHUP, only when an actual command
is typed and return is pressed does bash actually exit .

Also typing 'kill -HUP $$' in the bash child does make it exit correctly.

Version-Release number of selected component (if applicable):
3.0-38 to 3.0-40.1 

How reproducible:
100%

Steps to Reproduce:

1. start xterm with your $SHELL set to bash
2. try to click on the X/Exit button of the window manager frame 
3. xterm (bash) does not exit
4. Press return - xterm (bash) does not exit 
5. type any command or statement - eg. 'ls', 'echo $$' - then press return and
   bash & xterm exits.

The same behaviour occurs if the bash child process is set a HUP signal from 
the root user, not xterm - it waits for the next command before exiting. 

Additional Information:

At first I thought this was an xterm problem, but running eg.
  $ SHELL=ksh xterm
there are no such problems with xterm exiting.