Apply by doing:
       cd /usr/src
       patch -p0 < 012_uvm.patch
And then rebuild your kernel.

Index: sys/uvm/uvm_glue.c
===================================================================
RCS file: /cvs/src/sys/uvm/uvm_glue.c,v
retrieving revision 1.34
retrieving revision 1.34.2.1
diff -u -r1.34 -r1.34.2.1
--- sys/uvm/uvm_glue.c  2003/01/29 22:57:10     1.34
+++ sys/uvm/uvm_glue.c  2003/11/20 22:43:16     1.34.2.1
@@ -223,6 +223,8 @@
       map = &p->p_vmspace->vm_map;
       start = trunc_page((vaddr_t)addr);
       end = round_page((vaddr_t)addr + len);
+       if (end <= start)
+               return (EINVAL);

       rv = uvm_fault_wire(map, start, end, access_type);

@@ -242,8 +244,14 @@
       caddr_t addr;
       size_t  len;
{
-       uvm_fault_unwire(&p->p_vmspace->vm_map, trunc_page((vaddr_t)addr),
-               round_page((vaddr_t)addr + len));
+       vaddr_t start, end;
+
+       start = trunc_page((vaddr_t)addr);
+       end = round_page((vaddr_t)addr + len);
+       if (end <= start)
+               return;
+
+       uvm_fault_unwire(&p->p_vmspace->vm_map, start, end);
}

/*

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