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I am attaching the traceback of a python 2.4 crash.
The application I am developing executes many threads
and then has a "monitor" part that monitors certain
events. One event causes the application to shutdown.
On shutdown it notifies threads of a shutdown, and the
threads must cleanup and exit.
The traceback below occured on a shutdown. At the time
there was only one thread running.
I do not know how to investigate further. However given
pointers to do this I would be more than happy to
investigate and provide all information that could help
with this.
Some things I've observed:
1 - my application seems to be able to complete
successfully.
2 - it appears to be only after the app exits.
3 - it is not consistent. (too easy if it was!).
4 - more likely to occur the longer a
thread/application has run.
5 - does occur frequently enough to be a problem.
Once again let me know what other info I can provide,
or anything I can do to help.
Below is the traceback and some system/environment info.
Thanks.
---------------------------------------------------------------------------------
Error traceback:
-----------------
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
 File "/usr/lib/python2.4/atexit.py", line 22, in
_run_exitfuncs
 func(*targs, **kargs)
 File "/usr/lib/python2.4/threading.py", line 636, in
__exitfunc
 self._Thread__delete()
 File "/usr/lib/python2.4/threading.py", line 522, in
__delete
 del _active[_get_ident()]
KeyError: 16384
Error in sys.exitfunc:
Traceback (most recent call last):
 File "/usr/lib/python2.4/atexit.py", line 22, in
_run_exitfuncs
 func(*targs, **kargs)
 File "/usr/lib/python2.4/threading.py", line 636, in
__exitfunc
 self._Thread__delete()
 File "/usr/lib/python2.4/threading.py", line 522, in
__delete
 del _active[_get_ident()]
KeyError: 16384
Software environment:
-----------------------
*********************************************
*** SYSTEM INFORMATION ***
*** (Tue Mar 8 17:38:34 EST 2005) ***
*********************************************
 Machine type : i686
 Operating system : Linux
 Kernel version : 2.4.29
 Linux Distribution : Slackware 10.1.0
*********************************************
Python 2.4 (#1, Jan 1 2005, 21:33:55) [GCC 3.3.4] on
linux2
Gnu make 3.80
util-linux 2.12p
modutils 2.4.27
e2fsprogs tune2fs
Linux C Library 2.3.4
Dynamic linker (ldd) 2.3.4
Linux C++ Library 5.0.6
Procps 3.2.3
Net-tools 1.60
Kbd 1.12
Sh-utils 5.2.1
*********************************************
Modules Loaded:
	nfs
	lockd
	sunrpc
	ppp_deflate
	zlib_inflate
	zlib_deflate
	bsd_comp
	ppp_async
	ppp_generic
	slhc
	emu10k1
	ac97_codec
	soundcore
	xfs
	ne2k-pci
	8390
	crc32
*********************************************
gcc version 3.3.4
Reading specs from
/usr/lib/gcc-lib/i486-slackware-linux/3.3.4/specs
Configured with: ../gcc-3.3.4/configure --prefix=/usr
--enable-shared --enable-threads=posix
--enable-__cxa_atexit --disable-checking --with-gnu-ld
--verbose --target=i486-slackware-linux
--host=i486-slackware-linux
Thread model: posix
*********************************************

Does this still happen with newer Python versions? Could you provide an
example code?
Thanks!

I also experience this on a regular basis. I can't show you the code 
due to IP restrictions, but it happens almost 100% of the time in python 
2.4.4 on win2k8, and frequently in win2k3. 
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
 File "C:\Program Files\Opsware\agent\lcpython15\lib\atexit.py", line 
24, in _r un_exitfuncs
 func(*targs, **kargs)
 File "C:\Program Files\Opsware\agent\lcpython15\lib\threading.py", 
line 638, i n __exitfunc
 self._Thread__delete()
 File "C:\Program Files\Opsware\agent\lcpython15\lib\threading.py", 
line 522, i n __delete
 del _active[_get_ident()]
KeyError: 2540
Error in sys.exitfunc:
Traceback (most recent call last):
 File "C:\Program Files\Opsware\agent\lcpython15\lib\atexit.py", line 
24, in _r un_exitfuncs
 func(*targs, **kargs)
 File "C:\Program Files\Opsware\agent\lcpython15\lib\threading.py", 
line 638, i n __exitfunc
 self._Thread__delete()
 File "C:\Program Files\Opsware\agent\lcpython15\lib\threading.py", 
line 522, i n __delete
 del _active[_get_ident()]
KeyError: 2540

A sample script that reproduces this behavior in 2.6 is needed if this
one is to have a chance of being fixed.

the issue1596321 is very similar (same traceback on another platform).
The problem is still valid, and the discussion seems more advanced there.