The attached ogg stream is a dump from mpd's in-built http server.

This plays fine for me with the last core/base release, but not with git:

 gst-launch-0.10 playbin2 uri=file:///path/to/iamfirecracker.ogg
 gst-launch-0.10 playbin2 uri=pushfile:///path/to/iamfirecracker.ogg

With git I get this:

(a)

 gst-launch-0.10 playbin2 uri=file:///path/to/iamfirecracker.ogg

endless loop at 100% cpu at
oggdemux gstoggdemux.c:1343:gst_ogg_demux_seek:<oggdemux0> seeking to 0

(b)

 gst-launch-0.10 playbin2 uri=pushfile:///path/to/iamfirecracker.ogg

Lots of:
gstoggdemux.c:2826:gst_ogg_demux_handle_page:<oggdemux0> warning: unknown ogg pad for serial eaa42c7b detected
and then an error.

oggz-validate shows:
iamfirecracker.ogg: Error:
serialno 18446744073351212155: Terminal header page contains non-header segment


So looks like there's something dodgy going on with the headers handling.