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bug#21504: (require 'tramp) stuck on testing `tramp-ssh-controlmaster-op


From: 傅文辉
Subject: bug#21504: (require 'tramp) stuck on testing `tramp-ssh-controlmaster-options'
Date: Thu, 17 Sep 2015 10:26:12 +0800

Emacs 24.5.1, tramp 2.2.11-24.5

The following code stuck with some DNS settings

>>> file: tramp-loaddefs.el
(defvar tramp-ssh-controlmaster-options
  ...
  (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist")
  ...)
<<<

`ssh -o ControlPath=%C host.does.not.exist` stuck instead of going error 
quickly with DNS from my ISP (both home and workplace).




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