I tried rolling in the recent pmap.c/trap.c changes, (from pmap.c version
1.44) which move the pv attributes into the pv_table, and am seeing 
processes getting corrupted and dying.

My crude test case is building gnu make, and I see gcc die with
syntax errors.

I haven't seen this in a simulated environment (which lacks the 
cache coherency issues) but the simulator also has much more memory,
so it's not clearly a caching problem. 

Anyone else seen similar behavior?  This is with the old VM system, but
I believe similar behavior occurs with UVM.  (Just haven't rebuilt and 
tested lately.)

	-castor