internal error: getMBlock: mmap: Bad file number

I cut and paste the code from http://blog.moertel.com/articles/2004/03/13/concurrent-port-scanner-in-haskell

And compiled the resulting portscan.hs with both ghc-6.8.2 and ghc-6.6.1 on a host with Sun-Sparc [SunOS 5.10].

The following error occurred when the code was invoked.

portscan a_remote_sun_sparc_machine 1 1000
portscan: internal error: getMBlock: mmap: Bad file number
    (GHC version 6.6.1 for sparc_sun_solaris2)
    Please report this as a GHC bug:
http://www.haskell.org/ghc/reportabug
Abort

[ note: same result for 6.8.2 ]

[ note: if the remote machine is a linux machine, then the code works. ]

--HP