=== DF-3238 baseline (stock kernel #0) ===
cmd: cd /tmp && ./df3238_mapwalk_null   (as maxx, uid 1001)
result: kernel panic (see panic.txt); ssh session died at panic;
serial console shows fatal trap 12, fault addr 0x8, in
vm_map_rb_tree_RB_NEXT called from the procfs_domap walk.
Guest wedged at db> prompt; vm.sh status => down.