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The following code executes a thread that prints a message every second while the main thread shows a python shell. 
It will run fine and if one leaves the interpreter with <Ctrl-D> python will exit cleanly.
However if one press <Ctrl-C> to kill the interactive interpreter and then exits python or press return a couple of time you get a core dump.
My platform is:
 HP-UX te35 B.11.00 A 9000/785 2015352223 two-user license
I am running Python 2.0
This is the code of the test program:
#!/usr/local/bin/python
import time, threading, whrandom, code, sys
class MyThread(threading.Thread):
 """ reports once per second
 """
 def run(self):
 while 1:
 print "alive ...."
 time.sleep(1)
 print self.getName(), "is DONE"
if __name__ == '__main__':
 threadList = []
 # Create MyThread() threads
 t = MyThread()
 t.setDaemon(1)
 t.start()
 # This is the main thread ... since there is only one other
 # thread and it is a 'daemon', killing the main thread kills
 # the whole thing.
 locals = sys.modules['__main__'].__dict__
 code.interact(locals)

I can reproduce this on RH Linux, but not running Python under gdb.

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user_id=6380
I'm tentatively closing this; thread_pthread.h rev 2.33
blocks signals during thread creation, causing threads to be
started with all signals off. Please check that this in fact
resolves the problem.