this fix seems to work for me.

.mrg.
   
   thanks mouse.  i've been having these problems also recently.  i *think*
   this is the correct change, but i'm not sure.  i won't be able to test
   it until tonight...
   
   .mrg.
   
   Index: src/sys/vm/vm_swap.c
   *** vm_swap.c	Wed Jul  5 16:58:05 1995
   --- vm_swap.c	Wed Jul 19 18:02:23 1995
   ***************
   *** 271,277 ****
     	struct uio *uio;
     {
     
   ! 	return (physio(swstrategy, NULL, B_READ, minphys, uio));
     }
     
     int
   --- 271,277 ----
     	struct uio *uio;
     {
     
   ! 	return (physio(swstrategy, NULL, dev, B_READ, minphys, uio));
     }
     
     int
   ***************
   *** 280,286 ****
     	struct uio *uio;
     {
     
   ! 	return (physio(swstrategy, NULL, B_WRITE, minphys, uio));
     }
     
     /*
   --- 280,286 ----
     	struct uio *uio;
     {
     
   ! 	return (physio(swstrategy, NULL, dev, B_WRITE, minphys, uio));
     }
     
     /*