Nikolay Dyankov <ndyan...@gmail.com> added the comment:

OK, I found the reason and it is the very fact of using /dev/random
which would block if there aren't enough random numbers in queue.
Maybe dns-python should be using /dev/urandom instead (though there
might be reasons for not doing so).

The mystery is revealed.
I am closing the bug.
:)

----------
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6993>
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