Might be related to the longstanding Apache/mod_perl 2 bug in which it closes STDOUT but doesn't reopen it. See the thread at http://marc.info/?l=apache-modperl&m=126296015910250&w=2

In reply to Re: The old inappropriate ioctl bugaboo again, in mod_perl2 by swartz
in thread The old inappropriate ioctl bugaboo again, in mod_perl2 by jcabraham

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