Code with which I could reproduce the issue
MacOS Sierra Version 10.12.6
Are you trying to re-produce on the same environment that I mentioned above?
No, I'm testing with the 3.11.0, we don't support 2.6.0.
I could reproduce this issue with 3.11.0
with gevent.monkey.patch_all() I am not getting the error.
I'm closing this since gevent should be used with with everything patched, that is, at some point before importing anything doing: