user is in the group wheel, su runs but says "sorry". a ktrace shows a few
anomalies:

   284 su       CALL  getpriority(0,0)
   284 su       RET   getpriority 0
   284 su       CALL  setpriority(0,0,0xfffffffe)
   284 su       RET   setpriority -1 errno 13 Permission denied
...
   284 su       CALL  ioctl(0x5,TIOCGETA,0x7ffff188)
   284 su       RET   ioctl -1 errno 25 Inappropriate ioctl for device
   284 su       CALL  __fstat13(0x5,0x7ffff0c8)
   284 su       RET   __fstat13 0
...
   284 su       CALL  ioctl(0x5,TIOCGETA,0x7ffff158)
   284 su       RET   ioctl -1 errno 25 Inappropriate ioctl for device
   284 su       CALL  close(0x5)
   284 su       RET   close 0

This is all when it's dealing with the nsswitch stuff...

hmmm.

--
Christopher Kyin-hwa Chen <cchen@nougat.org>
<http://www.nougat.org/~cchen/>
"Everything is controlled by a small evil group
to which, unfortunately, no one we know belongs."