Xavier de Gaye added the comment:
The problem may still be reproduced by running the attached pdb_refleak.py
script. Enter three times 'c' (short for the pdb 'continue' command) and the
following line is printed:
pdb 3 -> pdb 2 -> pdb 1
This shows that the third pdb instance 'pdb 3', owns indirectly a reference to
the second and first pdb instances. As the _signal extension module owns a
reference to 'pdb 3' through its sigint_handler() method, then it also owns
indirectly a reference to 'pdb 1'.
----------
Added file: http://bugs.python.org/file44925/pdb_refleak.py
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<http://bugs.python.org/issue20766>
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