[Python-Dev] Bus error in transformer.py

[Paul Colomiets]

Martin v. Löwis wrote:
> You should run it under gdb, or attach to the interpreter
> from gdb.
>   
I've run it with gdb before (when posted  a bug),
and sometimes I got a huge traceback with
10000+ lines and sometimes less than 100
full of question marks so I've decided it's not of
a great interest. Today I've got quite good
backtrace :)
> Could it be that you get a stack overflow? To my knowledge,
> stack space is very scarce on FreeBSD if you use threads.
>   
Well, yes it is!

I've tested stack overflow before without using threads,
and it throws an exception as expected.

But this:
  def test():
      test()

  from threading import Thread
  t = Thread(target = test)
  t.start()
  t.join()
Produces "Segmentation fault" on python2.4 and "Bus error" on
python2.5.

Following line:
  threading.stack_size(1<<19)
Fixes this problem for python2.5.

Thanks a lot. I think I'll set up it in sitecustomize.py.
I don't know but maybe you should consider change platform defaults.

--
Paul.