Thank you both for the extra info, I think there's a different
bug for FIBER_USE_NATIVE=0 on my GNU/Linux system...

Anyways, for this segfault here is an updated v2 patch (for
r59776) which I'll commit soonish:

   https://80x24.org/spew/20170908062817.GA9144@dcvr/raw

I'll try to work on tracking down the test_io.rb stuckage with
FIBER_USE_NATIVE=0 tomorrow.  It seems to affect 2.4.1, even.

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