Encountered this first with Linux-2.5.25+rmap and it looks like the
problem also slipped into 2.5.27.  The same machine boots fine with a
vanilla 2.5.25 or 2.5.26, but gets this on boot with rmap.  The machine
is an 8-way PIII-700.

# free
             total       used       free     shared    buffers    
cached
Mem:       3871360     464796    3406564          0     110280    
110356
-/+ buffers/cache:     244160    3627200
Swap:     15719284          0   15719284

-Paul Larson