I think this is fixed by the following commit to python-cryptography.
commit 9837cb15b84fea92ffce3306d14160a8c11b1c65
Author: Paul Kehrer <[email protected]>
Date: Mon Aug 24 08:00:10 2015 -0500
make engine addition idempotent
Threading issues keep cropping up. ENGINE_add already
acquires a lock at the C layer via CRYPTO_w_lock (provided you
have registered the locking callbacks) so let's try to use that.
As part of this we'll try to init the openssl locks, but of course
there's potentially a race there as well. Clearly this isn't the real
fix but it might improve the situation while we try to determine what to
do.
** Changed in: python-cryptography (Ubuntu)
Status: New => Triaged
** Changed in: python-cryptography (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1601986
Title:
RuntimeError: osrandom engine already registered
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