Comment 5 for bug 158248

This is related to bug #125739 (mpg123 and mpg321 won't play audio preview in Nautilus (Gutsy)). Nautilus opens a FIFO when you hover over an audio (.ogg / .mp3) file, but doesn't close it because esound isn't installed on gutsy anymore.

To work around this bug you can either disable audio previews or install pulseaudio-esound-compat (and mpg321, sox and vorbis-tools if you want nautilus to actually play sound).

You can continually monitor the number of FIFOs nautilus has opened with the following command:
while /bin/true; do clear; lsof -c nautilus|awk '{ print $5; }'|sort|uniq -c|grep FIFO; sleep 1; done