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From: Josh MacDonald <jmacd@CS.Berkeley.EDU>
Message-Id: <199702231115.DAA16417@paris.CS.Berkeley.EDU>
To: freebsd-hackers@freebsd.org
Subject: more on killing traced processes
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Date: Sun, 23 Feb 1997 03:15:15 -0800
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Sorry for giving so little info.  Jordan replied off list
with an example of how not to show this behaviour, so I'll
provide an example.

Run gdb on /bin/cat:

Current directory is /bin/
GDB is free software and you are welcome to distribute copies of it
 under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.16 (i386-unknown-freebsd), Copyright 1996 Free Software Foundation, Inc...
(no debugging symbols found)...
(gdb) run
Starting program: /bin/cat 

Program received signal SIGINT, Interrupt.
0xe7b5 in ?? ()
(gdb) kill
Kill the program being debugged? (y or n) y
(gdb) 

A second attempt to kill from gdb reports, "The program is not
being run."

Investigation from 'ps' output shows that the /bin/cat process is
still running, in the TX state.  Running "kill -9 PID" will not
kill the process.  Only when the parent exits can it die.

-josh