Nick Coghlan <ncogh...@gmail.com> added the comment:

With issue 17611 merged (which moves stack unwinding to the compiler), I expect 
the exact details of this problem to have changed, but the general problem 
still exists: Ctrl-C may lead to __exit__ (or __aexit__) not being called even 
after __enter__ (or __aenter__) returns successfully, and this may happen even 
for context managers implemented with uninterruptible methods (e.g. in C in 
CPython without calling back into any Python code).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue29988>
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