I'm not familiar with the -fd option myself, but confirm it can be made
to crash:

Xmir :1 -fd 9999

** Changed in: xorg-server (Ubuntu)
       Status: New => Confirmed

** Changed in: xorg-server (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1675481

Title:
  Xmir crashes when using the '-fd' option

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  I'm trying to use the '-fd' option in Xmir and get a crash when Xmir
  starts up.

  This is what I'm doing:

  I'm using socket()/bind()/listen()/accept() on a AF_UNIX socket at
  /tmp/.X11-unix/X0 (or whatever available display number).  DISPLAY is
  then set based on this.  Then, when an X app accesses that socket, the
  code then starts Xmir and passes the fd returned in the accept() call
  to Xmir in the '-fd' option.

  This is what I get in journalctl when this crash occurs:
  http://pastebin.ubuntu.com/24235520/

  I installed the Xmir debug symbols and also passed in '-core' when
  starting Xmir and here is the bt: http://pastebin.ubuntu.com/24236088/

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