This 2.4.9-21 kernel is *not exactly* the same as 2.4.9-21 as provided
by Red Hat.  Matt Domsch applied Chris Pascoe's fix for the aacraid
driver (a one-line change, arguments to time_before() were backward,
causing an infinite stream of interrupts) as found in 2.4.9-21 and put
this fixed version here (with the same release number).  He also put a
tarball of the fixed aacraid.o modules out for people to just drop in
place to fix their installs.