[Python-Dev] Preserving the blamelist

Wed Apr 12 08:15:26 CEST 2006

[Neal Norwitz]
> ...
> I'm concerned about the negative ref leak in test_contextlib. I
> wonder if this was a result of PJE's fix for generators?

I don't know, but if you do
while 1:
 test_contextlib.test_main()
 gc.collect()
under a debug build it eventually (> 500 iterations) crashes with
 Fatal Python error: deallocating None
That's a pretty good clue ;-) The
	Py_XDECREF(gen->gi_frame);
in gen_dealloc() is on the call stack at the time, and cyclic gc is active.