Problem with 4D-25S ?

[Stan Johnson]

We have an IRIS 4D-25S set up as a fileserver (running 3.3.1).  We have an
intermittent problem reading tar files from cartridge tapes: the message
"WARNING: dma_map: address C055FFFF not word aligned" will display over
and over until the machine is reset.  This is not at all repeatable, and
our field service person was not able to find any problems after running
all the diagnostics.  It seems like a memory problem to me; any ideas on
how I could force the error so that our field service person can fix 
whatever needs to be fixed?  Another, possibly unrelated, error that I
haven't been able to track down is the message "NOTICE: plp/audio:
unexpected interrupt", which appears every few days on the console.  Any
help on this will be greatly appreciated..

-Stan Johnson
 NASA / Johnson Space Center
 Houston, Texas  77058
 (713) 483-4692
 johnson at euler.jsc.nasa.gov