Zoltan Krajcsovics <tem...@freemail.hu> added the comment:

In a span of about 1 month, I had multiple errors:

*** Error in `/usr/bin/python': free(): invalid next size (normal): 
0x000055f9c9e7c970 ***
*** Error in `/usr/bin/python': free(): invalid next size (normal): 
0x000055e33fda3970 ***
*** Error in `/usr/bin/python': free(): invalid next size (normal): 
0x0000564d42335970 ***
*** Error in `/usr/bin/python': double free or corruption (out): 
0x0000561d8b9d4f80 ***
*** Error in `/usr/bin/python': double free or corruption (out): 
0x0000557700e74f80 ***
*** Error in `/usr/bin/python': free(): invalid next size (normal): 
0x0000564b6142e970 ***

In the same time-period, I have been running the same code on another system, 
with a different python version, which did not produce any error:

python version that causes issues:
python --version
Python 2.7.13

python version that is error-free:
Python 2.7.9

----------
Added file: https://bugs.python.org/file47279/logs.txt

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<https://bugs.python.org/issue31790>
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