More problems with cam and devices

Following on from the panic on a week-old -CURRENT, I note that
camcontrol rescan doesn't do the right thing either.  On yesterday's
kernel, I did:

- remove a disk from a string

- run camcontrol rescan.  No change "Re-scan of bus 1 was successful",
  but the device entry was still there.

- Ran disk^H^H^H^Hbsdlabel against the drive.  For a while, nothing
  happened.  Then I got the messages:

  (da2:sym1:0:2:0): lost device
  (da2:sym1:0:2:0): removing device entry
  GEOM: destroy disk da2 dp=0xc2123450

After that, everything hangs.

This is repeatable, and I can take a dump if anybody's interested.

Greg
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