Cambié las opciones debug-on-errory debug-on-quit, luego presioné C-gcuando Emacs se suspendió. Obtuve este error de salida:
Debugger entered--Lisp error: (quit)
call-process("ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist")
(progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'"))))
(unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))
(save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))
(let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))))
(if (zerop (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result (concat result " -o ControlPath='tramp.%%r@%%h:%%p'")) (setq result (concat result " -o ControlPath='tramp.%%C'")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPersist") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn (setq result ...)))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))))
(progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlMaster") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn (setq result "-o ControlMaster=auto")))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (zerop (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char (point-min)) (if (search-forward-regexp "unknown.+key" nil t) (setq result ...) (setq result ...))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPersist") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn ...))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))))))
(if (executable-find "ssh") (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlMaster") (goto-char (point-min)) (if (search-forward-regexp "missing.+argument" nil t) (progn ...))) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (zerop (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPath=%C" "host.does.not.exist") (goto-char ...) (if ... ... ...)) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlPersist") (goto-char ...) (if ... ...)) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))))))
(progn (if (executable-find "ssh") (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn (call-process "ssh" nil t nil "-o" "ControlMaster") (goto-char ...) (if ... ...)) (and (buffer-name temp-buffer) (kill-buffer temp-buffer))))) (if (zerop (length result)) nil (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ... ...) (and ... ...)))) (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ... ...) (and ... ...))))))))
(condition-case nil (progn (if (executable-find "ssh") (progn (let ((temp-buffer (generate-new-buffer " *temp*"))) (save-current-buffer (set-buffer temp-buffer) (unwind-protect (progn ... ... ...) (and ... ...)))) (if (zerop (length result)) nil (let ((temp-buffer ...)) (save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))) (let ((temp-buffer ...)) (save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))))))) (error nil))
(let ((result "") (case-fold-search t)) (condition-case nil (progn (if (executable-find "ssh") (progn (let ((temp-buffer ...)) (save-current-buffer (set-buffer temp-buffer) (unwind-protect ... ...))) (if (zerop (length result)) nil (let (...) (save-current-buffer ... ...)) (let (...) (save-current-buffer ... ...)))))) (error nil)) result)
(defvar tramp-ssh-controlmaster-options (let ((result "") (case-fold-search t)) (condition-case nil (progn (if (executable-find "ssh") (progn (let (...) (save-current-buffer ... ...)) (if (zerop ...) nil (let ... ...) (let ... ...))))) (error nil)) result) "Call ssh to detect whether it supports the Control* arguments.\nReturn a string to be used in `tramp-methods'.")
eval-buffer(#<buffer *load*-504950> nil "/usr/share/emacs/24.5/lisp/net/tramp-loaddefs.el" nil t) ; Reading at buffer position 7082
load-with-code-conversion("/usr/share/emacs/24.5/lisp/net/tramp-loaddefs.el" "/usr/share/emacs/24.5/lisp/net/tramp-loaddefs.el" nil t)
#<subr require>(tramp-loaddefs nil nil)
ad-Advice-require(#<subr require> tramp-loaddefs)
apply(ad-Advice-require #<subr require> tramp-loaddefs)
require(tramp-loaddefs)
byte-code("\300\301!\207" [require tramp-loaddefs] 2)
byte-code("\300\301\302\303#\210\300\304\305\306#\210\300\304\307\306#\210\300\304\310\306#\210\300\304\311\306#\210\300\304\312\306#\210\300\304\313\306#\210\300\314\315\316#\210\300\317\320\316#\210\300\304\321\306#\210\300\322\323\306#\210\300\324\325\306#\210\300\322\326\306#\210\300\327\330\316#\210\300\331\332\303#\210\300\331\333\303#\210\300\331\334\303#\210\300\331\335\303#\210\300\331\336\303#\210\300\337\340\341#\210\342\343!\203\206
Y ssh daemon también solicita la contraseña a través del programa ksshaskpass: aquí está la captura de pantalla.
