[issue18748] io.IOBase destructor silence I/O error on close() by default

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Running the file couple of times will make the interpreter fail with: libgcc_s.so.1 must be installed for pthread_cancel to work

See also bpo-44434: "_thread module: Remove redundant PyThread_exit_thread() call to avoid glibc fatal error: libgcc_s.so.1 must be installed for pthread_cancel to work".

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<https://bugs.python.org/issue18748>
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