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From: Richard Stallman <rms@gnu.org>
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Subject: Re: insert-file-contents and fifos
Date: Mon, 6 May 2002 00:24:29 -0600 (MDT)
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    GNU emacs 20 was capable of reading from this, 21 is not. The change
    appears to be the introduction of the new read_non_regular function
    in fileio.c : a strace shows emacs fetching the data from the file
    ( you can see the data being read ), and then aborting. Presumably
    the state of a fifo is sufficiently different from a non-regular file
    that read_non_regular reacts as if an error has occurred.

Could you step through it and see why this happens?
The code looks straightforward, so I don't see why it would fail.