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From: Hleb Valoshka <375gnu@gmail.com>
Newsgroups: gmane.comp.lang.ruby.posix-mq.general
Subject: Re: [PATCH 3/3] Add a sleep in alarm test in current Ruby.
Date: Thu, 12 Jul 2012 11:03:05 +0300
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This issue can be reproduced with 3 simple LOC

mkfifo myfifo
ruby -e "a=0;trap(:USR2) {a+=1}; IO.readlines('myfifo') rescue nil; puts a"
killall -USR2 ruby

And it affects only GNU/Linux and OpenBSD but not FreeBSD or GNU/kFreeBSD.

I've filed an issue: https://bugs.ruby-lang.org/issues/6725