William Bowling added the comment:
Also a very similar source causes a slightly different crash
(heap-buffer-overflow instead of heap-use-after-free):
./python -c 'with open("vuln2.py", "wb") as f:
f.write(b"\x61\x73\x00\x0a\x79\x6e\x63\x5c\x0a\x00\x0d\xdd")'
./python vuln2.py
Python 3.5.1+ (default, Jan 4 2016, 00:05:40)
Attached the asan report
----------
Added file: http://bugs.python.org/file41487/asan2.txt
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