--- Comment #8 from ---
A commit references this bug:

Author: grehan
Date: Wed Sep 10 05:44:16 UTC 2014
New revision: 271350

  Fix issue with nmdm and leading zeros in device name.

  The nmdm code enforces a number between the 'nmdm' and 'A|B' portions
  of the device name. This is then used as a unit number, and sprintf'd
  back into the tty name. If leading zeros were used in the name,
  the created device name is different than the string used for the
  clone-open (e.g. /dev/nmdm0001A will result in /dev/nmdm1A).

  Since unit numbers are no longer required with the updated tty
  code, there seems to be no reason to force the string to be a
  number. The fix is to allow an arbitrary string between
  'nmdm' and 'A|B', within the constraints of devfs names. This allows
  all existing user of numeric strings to continue to work, and also
  allows more meaningful names to be used, such as bhyve VM names.

  Tested on amd64, i386 and ppc64.

  Reported by:    Dave Smith
  PR:        192281
  Reviewed by:    neel, glebius
  Phabric:    D729
  MFC after:    3 days


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