Try to add following two lines after print "output #2\n";: 

sleep 5;
print "output #3\n";

[download]
and you will get your SIGPIPE.

Update:

<Reveal this spoiler or all in this thread>

In reply to Re: SIGPIPE not trapped after sleep in CGI by zwon
in thread SIGPIPE not trapped after sleep in CGI by GwenDragon

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