Here's the patch in question:
http://github.com/ThomasAdam/tmux/commit/b50a375d54c4d76e55fb8ba2e1901109f1127bff
OpenBSD patchset 684:
Catch SIGCHLD to avoid a zombie, from patrick keshishian
Ignored signals are inherited by child processes (at least on systems
like Mac OS X), which means that lots of stuff breaks badly. Either
reset SIGCHLD to SIG_DFL (when forking or after starting the server),
or use a SIGCHLD handler which reaps zombies instead of SIG_IGN.
-Mark
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