With NetBSD 1.2B, vmstat, iostat etc all fail with 

  vmstat: can't reference kptr 0xf8f141a
  vmstat: kvm_read: Bad address

Well for iostat it says "iostat: ...." rather than "vmstat: ..." :-) !

The utilities are from the 1.2 binary distribution (pc532) and work with
the kernel from that binary distribution. The 1.2B kernel has been built
from sources ftp'd from the NetBSD-current/tar_files/src directory
a few days ago.

Also with the new kernel, ps doesn't show process arguments.

Has the interface changed? Do I need to recompile the utilities?

Ian