The test program attached works with 2.0.22 but does not with 2.1.5. It looks like the signal socketpair event in the child is never fired (it does not get as far as trying to read).
I've tried it on Linux but also some reports that the same problem appears on OS X (it affects tmux).
The actual signal doesn't seem to matter. I've use USR1 here, in tmux it is CHLD.
$ CPPFLAGS='-I/opt/libevent20/include' LDFLAGS='-L/opt/libevent20/lib -levent' make test-reinit
$ CPPFLAGS='-I/opt/libevent21/include' LDFLAGS='-L/opt/libevent21/lib -levent' make test-reinit
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