sendWakeup bug #5553

[Bit Connor]

Here's a bug I submitted 4 weeks ago, and there hasn't been much
activity or responses regarding it since then:

http://hackage.haskell.org/trac/ghc/ticket/5553

It causes the error message:

    ghc_sendWakeup_bug: sendWakeup: invalid argument (Bad file descriptor)

It would be great if someone could take a look at this, or at least
verify that you are able to reproduce the error using the test code
provided in the bug report.

Thanks,
Bit