Xinmeng Xia <xi...@smail.nju.edu.cn> added the comment:

Thank you. But I am not sure this is a recursion problem. Please see the 
following example, I replace "__sizeof__" with "__class__". No segmentation 
fault. Everything goes well.

========================
mystr  = "hello123"
print(dir(mystr))
for x in range(1000000):
    mystr = mystr.__class__
    print(mystr)
=========================
and

=========================
mystr  = "hello123"
for x in range(1000000):
    mystr = mystr.__class__
input('>')  # Hit Enter to continue.
del mystr   # Expect crash here.
input('<')  # And never get here
=========================
No segmentation fault

----------

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42887>
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