STINNER Victor added the comment:

I tried Python 3.6 with "./configure --with-pydebug --without-pymalloc 
--with-valgrind". The py-bt commands works as expect in gdb.

Can you try to modify python-gdb.py to get a traceback of your Invalid cast 
error?

> I am able to fix it with the following commands:
> (...) _type_char_ptr = gdb.lookup_type('char').pointer() # char*

These defines are already in Tools/gdb/libpython.py (python-gdb.py is just a 
copy). I don't understand why you have to redeclare these variables again.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26799>
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