Subject: Re: tramp (2.2.13.25.1); ido virtual buffer interaction
From: Dave Abrahams <[email-masked]>
To: Michael Albinus <[email-masked]>
Cc: [email-masked]
Date: Mon, 21 Nov 2016 08:14:08 -0800

on Mon Nov 21 2016, Michael Albinus <michael.albinus-AT-gmx.de> wrote:

> Dave Abrahams <[email-masked]> writes:
>
> Hi Dave,
>
>> More info.  Ido uses recentf, which has an interaction with TRAMP
>> documented here: https://www.emacswiki.org/emacs/RecentFiles#toc12
>
> Well, there are also other mysteries. In the git logfile, there is the
> entry
>
> commit b2b84b166a7ac454850ab4832ef40a41dce74cf7
> Author: Leo Liu <[email-masked]>
> Date:   Fri Dec 25 19:10:13 2015 +0800
>
>     * ido.el (ido-add-virtual-buffers-to-list): Use bookmark-get-filename.
>
> Maybe it is related.
>
> Could you, pls, rerun your test like this:
>
> M-x tramp-cleanup-all-buffers
> M-: (setq tramp-verbose 10)
> C-x b
>
> It will fail like reported. But there will also be a Tramp debug buffer,
> containing a backtrace. This might tell us what triggers the new Tramp
> connection.

Voilà:

;; GNU Emacs: 25.1.1 Tramp: 2.2.13.25.1 -*- mode: outline; -*-
;; Location: /Applications/Gnus.app/Contents/Resources/lisp/net/tramp.elc Git: nil
08:11:04.937955 tramp-get-connection-property (7) # ~ undef
08:11:04.938168 tramp-get-connection-property (7) # process-name nil
08:11:04.938248 tramp-get-connection-property (7) # process-name nil
08:11:04.938311 tramp-get-connection-property (7) # process-buffer nil
08:11:04.939237 tramp-maybe-open-connection (3) # Opening connection for wingy using scp...
08:11:04.940014 tramp-call-process (6) # ��locale -a�� nil  *temp*
08:11:04.978508 tramp-call-process (6) # 0
af_ZA
af_ZA.ISO8859-1
af_ZA.ISO8859-15
af_ZA.UTF-8
am_ET
am_ET.UTF-8
be_BY
be_BY.CP1131
be_BY.CP1251
be_BY.ISO8859-5
be_BY.UTF-8
bg_BG
bg_BG.CP1251
bg_BG.UTF-8
ca_ES
ca_ES.ISO8859-1
ca_ES.ISO8859-15
ca_ES.UTF-8
cs_CZ
cs_CZ.ISO8859-2
cs_CZ.UTF-8
da_DK
da_DK.ISO8859-1
da_DK.ISO8859-15
da_DK.UTF-8
de_AT
de_AT.ISO8859-1
de_AT.ISO8859-15
de_AT.UTF-8
de_CH
de_CH.ISO8859-1
de_CH.ISO8859-15
de_CH.UTF-8
de_DE
de_DE.ISO8859-1
de_DE.ISO8859-15
de_DE.UTF-8
el_GR
el_GR.ISO8859-7
el_GR.UTF-8
en_AU
en_AU.ISO8859-1
en_AU.ISO8859-15
en_AU.US-ASCII
en_AU.UTF-8
en_CA
en_CA.ISO8859-1
en_CA.ISO8859-15
en_CA.US-ASCII
en_CA.UTF-8
en_GB
en_GB.ISO8859-1
en_GB.ISO8859-15
en_GB.US-ASCII
en_GB.UTF-8
en_IE
en_IE.UTF-8
en_NZ
en_NZ.ISO8859-1
en_NZ.ISO8859-15
en_NZ.US-ASCII
en_NZ.UTF-8
en_US
en_US.ISO8859-1
en_US.ISO8859-15
en_US.US-ASCII
en_US.UTF-8
es_ES
es_ES.ISO8859-1
es_ES.ISO8859-15
es_ES.UTF-8
et_EE
et_EE.ISO8859-15
et_EE.UTF-8
eu_ES
eu_ES.ISO8859-1
eu_ES.ISO8859-15
eu_ES.UTF-8
fi_FI
fi_FI.ISO8859-1
fi_FI.ISO8859-15
fi_FI.UTF-8
fr_BE
fr_BE.ISO8859-1
fr_BE.ISO8859-15
fr_BE.UTF-8
fr_CA
fr_CA.ISO8859-1
fr_CA.ISO8859-15
fr_CA.UTF-8
fr_CH
fr_CH.ISO8859-1
fr_CH.ISO8859-15
fr_CH.UTF-8
fr_FR
fr_FR.ISO8859-1
fr_FR.ISO8859-15
fr_FR.UTF-8
he_IL
he_IL.UTF-8
hi_IN.ISCII-DEV
hr_HR
hr_HR.ISO8859-2
hr_HR.UTF-8
hu_HU
hu_HU.ISO8859-2
hu_HU.UTF-8
hy_AM
hy_AM.ARMSCII-8
hy_AM.UTF-8
is_IS
is_IS.ISO8859-1
is_IS.ISO8859-15
is_IS.UTF-8
it_CH
it_CH.ISO8859-1
it_CH.ISO8859-15
it_CH.UTF-8
it_IT
it_IT.ISO8859-1
it_IT.ISO8859-15
it_IT.UTF-8
ja_JP
ja_JP.eucJP
ja_JP.SJIS
ja_JP.UTF-8
kk_KZ
kk_KZ.PT154
kk_KZ.UTF-8
ko_KR
ko_KR.CP949
ko_KR.eucKR
ko_KR.UTF-8
lt_LT
lt_LT.ISO8859-13
lt_LT.ISO8859-4
lt_LT.UTF-8
nl_BE
nl_BE.ISO8859-1
nl_BE.ISO8859-15
nl_BE.UTF-8
nl_NL
nl_NL.ISO8859-1
nl_NL.ISO8859-15
nl_NL.UTF-8
no_NO
no_NO.ISO8859-1
no_NO.ISO8859-15
no_NO.UTF-8
pl_PL
pl_PL.ISO8859-2
pl_PL.UTF-8
pt_BR
pt_BR.ISO8859-1
pt_BR.UTF-8
pt_PT
pt_PT.ISO8859-1
pt_PT.ISO8859-15
pt_PT.UTF-8
ro_RO
ro_RO.ISO8859-2
ro_RO.UTF-8
ru_RU
ru_RU.CP1251
ru_RU.CP866
ru_RU.ISO8859-5
ru_RU.KOI8-R
ru_RU.UTF-8
sk_SK
sk_SK.ISO8859-2
sk_SK.UTF-8
sl_SI
sl_SI.ISO8859-2
sl_SI.UTF-8
sr_YU
sr_YU.ISO8859-2
sr_YU.ISO8859-5
sr_YU.UTF-8
sv_SE
sv_SE.ISO8859-1
sv_SE.ISO8859-15
sv_SE.UTF-8
tr_TR
tr_TR.ISO8859-9
tr_TR.UTF-8
uk_UA
uk_UA.ISO8859-5
uk_UA.KOI8-U
uk_UA.UTF-8
zh_CN
zh_CN.eucCN
zh_CN.GB18030
zh_CN.GB2312
zh_CN.GBK
zh_CN.UTF-8
zh_HK
zh_HK.Big5HKSCS
zh_HK.UTF-8
zh_TW
zh_TW.Big5
zh_TW.UTF-8
C
POSIX
08:11:04.978852 tramp-get-local-locale (7) # locale en_US.UTF-8
08:11:04.979408 tramp-get-connection-property (7) # login-args undef
08:11:04.979499 tramp-get-connection-property (7) # login-args undef
08:11:04.979592 tramp-get-connection-property (7) # process-name nil
08:11:04.979668 tramp-get-connection-property (7) # process-buffer nil
08:11:05.012183 tramp-set-connection-property (7) # vector [scp nil wingy tmp nil]
08:11:05.012418 tramp-maybe-open-connection (6) # /bin/sh -i
08:11:05.012512 tramp-get-connection-property (7) # vector [scp nil wingy tmp nil]
08:11:05.012601 tramp-get-connection-property (7) # check-remote-echo nil
08:11:05.012688 tramp-get-connection-property (7) # check-remote-echo nil
08:11:05.012831 tramp-get-connection-property (7) # gateway nil
08:11:05.017918 tramp-accept-process-output (10) # *tramp/scp wingy* run *tramp/scp wingy*
#$ 
08:11:05.018028 tramp-get-connection-property (7) # check-remote-echo nil
08:11:05.018101 tramp-get-connection-property (7) # check-remote-echo nil
08:11:05.018180 tramp-wait-for-regexp (6) # 
#$ 
08:11:05.018270 tramp-get-connection-property (7) # login-program undef
08:11:05.018355 tramp-get-connection-property (7) # login-args undef
08:11:05.018426 tramp-get-connection-property (7) # login-env undef
08:11:05.018504 tramp-get-connection-property (7) # async-args undef
08:11:05.018578 tramp-get-connection-property (7) # connection-timeout undef
08:11:05.018661 tramp-get-connection-property (7) # gw-args undef
08:11:05.018764 tramp-get-connection-property (7) # temp-file undef
08:11:05.018907 tramp-set-connection-property (7) # temp-file /var/folders/8v/9769m3ps7ds7h9pg23lzcls00000gn/T/tramp.25806eKB
08:11:05.020295 tramp-maybe-open-connection (3) # Sending command ��exec ssh   -o ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none wingy��
08:11:05.020395 tramp-get-connection-property (7) # process-name nil
08:11:05.020477 tramp-get-connection-property (7) # remote-echo nil
08:11:05.020543 tramp-send-command (6) # exec ssh   -o ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none wingy
08:11:05.020625 tramp-get-connection-property (7) # process-name nil
08:11:05.020697 tramp-get-connection-property (7) # chunksize nil
08:11:05.020770 tramp-set-connection-property (7) # last-cmd-time (22579 7321 20749 0)
08:11:05.020843 tramp-send-string (10) # exec ssh   -o ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none wingy
08:11:05.020919 tramp-get-connection-property (7) # process-buffer nil
08:11:05.021104 tramp-set-connection-property (7) # first-password-request t
08:11:05.022118 tramp-process-actions (3) # Waiting for prompts from remote shell...
08:11:05.023526 tramp-get-connection-property (7) # gateway nil
08:11:05.041183 tramp-get-connection-property (7) # vector [scp nil wingy tmp nil]
08:11:05.041320 tramp-process-sentinel (5) # Sentinel called: ��#<process *tramp/scp wingy*>�� ��exited abnormally with code 255
��
08:11:05.041412 tramp-flush-connection-property (7) # *tramp/scp wingy* (vector temp-file last-cmd-time)
08:11:05.041528 tramp-get-file-property (8) #  file-truename nil
08:11:05.041607 tramp-flush-directory-property (8) # 
08:11:05.041717 tramp-process-one-action (5) # Looking for regexp "\(.*\(user\|login\)\( .*\)?: *\)\'" from remote shell
08:11:05.042029 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|�\)a\)\|geslo\|h\(?:\(?:as�\|esl\)o\)\|iphasiwedi\|jelsz�\|l\(?:ozinka\|�senord\)\|m\(?:ot de passe\|�t kh�u\)\|pa\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord\|phrase\|wor[dt]\)\|vorto\)\)\|s\(?:alasana\|enha\|lapta�odis\)\|wachtwoord\|�������\|������\|����\|���� ����\|��������ඤ���\|�ଥ��������\|��������ඦ���\|�ྦ�����ధ��\|�ྨ൨�\|�ྪ൪���\|����ଭ�� ����������\|������������������\|��������રற�\|��������લ\|�����ྴ൴��������\|��������௶\|���ក�������������ត��\|�����ド\|��[���]\|���\)\).*:? *\)\'" from remote shell
08:11:05.042230 tramp-process-one-action (5) # Looking for regexp "\(^.*\(Connection \(?:\(?:clo\|refu\)sed\)\|Host key verification failed\.\|Login \(?:[Ii]ncorrect\)\|N\(?:ame or service not known\|o supported authentication methods left to try!\)\|Permission denied\|\(?:Sorry, try again\|Timeout, server not responding\)\.\).*\|^.*\(Received signal [0-9]+\).*\)\'" from remote shell
08:11:05.042347 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%>
]*[#$%>] *\)\'" from remote shell
08:11:05.042429 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|\)[^]#$%>
]*#?[]#$%>] *\(\[[0-9;]*[a-zA-Z] *\)*\)\'" from remote shell
08:11:05.042519 tramp-process-one-action (5) # Looking for regexp "\(\(Are you sure you want to continue connecting (yes/no)\?\)\s-*\)\'" from remote shell
08:11:05.042605 tramp-process-one-action (5) # Looking for regexp "\(\(\(?:Store key in cache\? (y/\|Update cached key\? (y/n, Return cancels connectio\)n)\)\s-*\)\'" from remote shell
08:11:05.042694 tramp-process-one-action (5) # Looking for regexp "\(\(TERM = (.*)\|Terminal type\? \[.*\]\)\s-*\)\'" from remote shell
08:11:05.042784 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell
08:11:05.042856 tramp-process-one-action (5) # Call ��tramp-action-process-alive��
08:11:05.042981 tramp-get-connection-property (7) # process-buffer nil
08:11:05.043047 tramp-process-actions (6) # 
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
08:11:05.043119 tramp-get-connection-property (7) # process-buffer nil
08:11:05.044289 tramp-process-actions (10) # 
  backtrace()
  tramp-error([#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] file-error "Tramp failed to connect.  If this happens repeatedly, try
    ��M-x tramp-cleanup-this-connection��")
  apply(tramp-error [#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] file-error "Tramp failed to connect.  If this happens repeatedly, try
    ��M-x tramp-cleanup-this-connection��" nil)
  tramp-process-actions(#<process *tramp/scp wingy*> [#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] 1 ((tramp-login-prompt-regexp tramp-action-login) (tramp-password-prompt-regexp tramp-action-password) (tramp-wrong-passwd-regexp tramp-action-permission-denied) (shell-prompt-pattern tramp-action-succeed) (tramp-shell-prompt-pattern tramp-action-succeed) (tramp-yesno-prompt-regexp tramp-action-yesno) (tramp-yn-prompt-regexp tramp-action-yn) (tramp-terminal-prompt-regexp tramp-action-terminal) (tramp-process-alive-regexp tramp-action-process-alive)) 60)
  tramp-maybe-open-connection([#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil])
  tramp-send-command([#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] "cd ~ && pwd")
  tramp-sh-handle-expand-file-name("/wingy:tmp" nil)
  apply(tramp-sh-handle-expand-file-name ("/wingy:tmp" nil))
  tramp-sh-file-name-handler(expand-file-name "/wingy:tmp" nil)
  apply(tramp-sh-file-name-handler expand-file-name ("/wingy:tmp" nil))
  tramp-file-name-handler(expand-file-name "/wingy:tmp" nil)
  expand-file-name("/wingy:tmp" nil)
  apply(expand-file-name ("/wingy:tmp" nil))
  tramp-completion-run-real-handler(expand-file-name ("/wingy:tmp" nil))
  tramp-completion-file-name-handler(expand-file-name "/wingy:tmp" nil)
  get-file-buffer("/wingy:tmp")
  ido-add-virtual-buffers-to-list()
  ido-make-buffer-list(nil)
  ido-read-internal(buffer "Buffer: " ido-buffer-history nil confirm-after-completion nil)
  ido-buffer-internal(raise-frame)
  ido-switch-buffer()
  funcall-interactively(ido-switch-buffer)
  call-interactively(ido-switch-buffer nil nil)
  command-execute(ido-switch-buffer)
08:11:05.044433 tramp-process-actions (1) # File error: Tramp failed to connect.  If this happens repeatedly, try
    ��M-x tramp-cleanup-this-connection��
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
08:11:18.558491 tramp-maybe-open-connection (3) # Opening connection for wingy using scp...failed
08:11:24.215526 tramp-get-connection-property (7) # ~ undef
08:11:24.215667 tramp-get-connection-property (7) # process-name nil
08:11:24.215742 tramp-get-connection-property (7) # process-name nil
08:11:24.215809 tramp-get-connection-property (7) # process-buffer nil
08:11:24.216563 tramp-maybe-open-connection (3) # Opening connection for wingy using scp...
08:11:24.217375 tramp-get-connection-property (7) # login-args undef
08:11:24.217475 tramp-get-connection-property (7) # login-args undef
08:11:24.217562 tramp-get-connection-property (7) # process-name nil
08:11:24.217633 tramp-get-connection-property (7) # process-buffer nil
08:11:24.248785 tramp-set-connection-property (7) # vector [scp nil wingy tmp nil]
08:11:24.249006 tramp-maybe-open-connection (6) # /bin/sh -i
08:11:24.249103 tramp-get-connection-property (7) # vector [scp nil wingy tmp nil]
08:11:24.249191 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.249268 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.249406 tramp-get-connection-property (7) # gateway nil
08:11:24.255894 tramp-accept-process-output (10) # *tramp/scp wingy* run *tramp/scp wingy*
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
#$ 
08:11:24.256015 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.256085 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.256161 tramp-wait-for-regexp (6) # 
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
#$ 
08:11:24.256258 tramp-get-connection-property (7) # login-program undef
08:11:24.256352 tramp-get-connection-property (7) # login-args undef
08:11:24.256478 tramp-get-connection-property (7) # login-env undef
08:11:24.256567 tramp-get-connection-property (7) # async-args undef
08:11:24.256658 tramp-get-connection-property (7) # connection-timeout undef
08:11:24.256752 tramp-get-connection-property (7) # gw-args undef
08:11:24.256871 tramp-get-connection-property (7) # temp-file undef
08:11:24.257037 tramp-set-connection-property (7) # temp-file /var/folders/8v/9769m3ps7ds7h9pg23lzcls00000gn/T/tramp.25806rUH
08:11:24.258533 tramp-maybe-open-connection (3) # Sending command ��exec ssh   -o ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none wingy��
08:11:24.258645 tramp-get-connection-property (7) # process-name nil
08:11:24.258721 tramp-get-connection-property (7) # remote-echo nil
08:11:24.258787 tramp-send-command (6) # exec ssh   -o ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none wingy
08:11:24.258854 tramp-get-connection-property (7) # process-name nil
08:11:24.258921 tramp-get-connection-property (7) # chunksize nil
08:11:24.258984 tramp-set-connection-property (7) # last-cmd-time (22579 7340 258962 0)
08:11:24.259069 tramp-send-string (10) # exec ssh   -o ControlMaster=auto -o ControlPath='tramp.%C' -o ControlPersist=no -e none wingy
08:11:24.259134 tramp-get-connection-property (7) # process-buffer nil
08:11:24.259345 tramp-set-connection-property (7) # first-password-request t
08:11:24.260197 tramp-process-actions (3) # Waiting for prompts from remote shell...
08:11:24.261134 tramp-get-connection-property (7) # gateway nil
08:11:24.323234 tramp-accept-process-output (10) # *tramp/scp wingy* run *tramp/scp wingy*
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
08:11:24.323413 tramp-process-one-action (5) # Looking for regexp "\(.*\(user\|login\)\( .*\)?: *\)\'" from remote shell
08:11:24.323526 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.323613 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.323961 tramp-process-one-action (5) # Looking for regexp "\(^.*\(\(?:adgangskode\|contrase\(?:\(?:ny\|�\)a\)\|geslo\|h\(?:\(?:as�\|esl\)o\)\|iphasiwedi\|jelsz�\|l\(?:ozinka\|�senord\)\|m\(?:ot de passe\|�t kh�u\)\|pa\(?:rola\|s\(?:ahitza\|s\(?: phrase\|code\|ord\|phrase\|wor[dt]\)\|vorto\)\)\|s\(?:alasana\|enha\|lapta�odis\)\|wachtwoord\|�������\|������\|����\|���� ����\|��������ඤ���\|�ଥ��������\|��������ඦ���\|�ྦ�����ధ��\|�ྨ൨�\|�ྪ൪���\|����ଭ�� ����������\|������������������\|��������રற�\|��������લ\|�����ྴ൴��������\|��������௶\|���ក�������������ត��\|�����ド\|��[���]\|���\)\).*:? *\)\'" from remote shell
08:11:24.324051 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324114 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324271 tramp-process-one-action (5) # Looking for regexp "\(^.*\(Connection \(?:\(?:clo\|refu\)sed\)\|Host key verification failed\.\|Login \(?:[Ii]ncorrect\)\|N\(?:ame or service not known\|o supported authentication methods left to try!\)\|Permission denied\|\(?:Sorry, try again\|Timeout, server not responding\)\.\).*\|^.*\(Received signal [0-9]+\).*\)\'" from remote shell
08:11:24.324345 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324406 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324506 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%>
]*[#$%>] *\)\'" from remote shell
08:11:24.324570 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324635 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324710 tramp-process-one-action (5) # Looking for regexp "\(\(?:^\|\)[^]#$%>
]*#?[]#$%>] *\(\[[0-9;]*[a-zA-Z] *\)*\)\'" from remote shell
08:11:24.324774 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324854 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.324937 tramp-process-one-action (5) # Looking for regexp "\(\(Are you sure you want to continue connecting (yes/no)\?\)\s-*\)\'" from remote shell
08:11:24.324999 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325062 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325130 tramp-process-one-action (5) # Looking for regexp "\(\(\(?:Store key in cache\? (y/\|Update cached key\? (y/n, Return cancels connectio\)n)\)\s-*\)\'" from remote shell
08:11:24.325194 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325253 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325320 tramp-process-one-action (5) # Looking for regexp "\(\(TERM = (.*)\|Terminal type\? \[.*\]\)\s-*\)\'" from remote shell
08:11:24.325389 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325449 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325517 tramp-process-one-action (5) # Looking for regexp "\(\)\'" from remote shell
08:11:24.325581 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325642 tramp-get-connection-property (7) # check-remote-echo nil
08:11:24.325709 tramp-process-one-action (5) # Call ��tramp-action-process-alive��
08:11:24.325825 tramp-get-connection-property (7) # process-buffer nil
08:11:24.325895 tramp-process-actions (6) # 
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
08:11:24.325999 tramp-get-connection-property (7) # vector [scp nil wingy tmp nil]
08:11:24.326072 tramp-process-sentinel (5) # Sentinel called: ��#<process *tramp/scp wingy*>�� ��exited abnormally with code 255
��
08:11:24.326156 tramp-flush-connection-property (7) # *tramp/scp wingy* (vector temp-file last-cmd-time)
08:11:24.326261 tramp-get-file-property (8) #  file-truename nil
08:11:24.326331 tramp-flush-directory-property (8) # 
08:11:24.327972 tramp-get-connection-property (7) # process-buffer nil
08:11:24.329135 tramp-process-actions (10) # 
  backtrace()
  tramp-error([#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] file-error "Tramp failed to connect.  If this happens repeatedly, try
    ��M-x tramp-cleanup-this-connection��")
  apply(tramp-error [#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] file-error "Tramp failed to connect.  If this happens repeatedly, try
    ��M-x tramp-cleanup-this-connection��" nil)
  tramp-process-actions(#<process *tramp/scp wingy*> [#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] 86 ((tramp-login-prompt-regexp tramp-action-login) (tramp-password-prompt-regexp tramp-action-password) (tramp-wrong-passwd-regexp tramp-action-permission-denied) (shell-prompt-pattern tramp-action-succeed) (tramp-shell-prompt-pattern tramp-action-succeed) (tramp-yesno-prompt-regexp tramp-action-yesno) (tramp-yn-prompt-regexp tramp-action-yn) (tramp-terminal-prompt-regexp tramp-action-terminal) (tramp-process-alive-regexp tramp-action-process-alive)) 60)
  tramp-maybe-open-connection([#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil])
  tramp-send-command([#("scp" 0 3 (tramp-default t)) nil "wingy" "tmp" nil] "cd ~ && pwd")
  tramp-sh-handle-expand-file-name("/wingy:tmp" nil)
  apply(tramp-sh-handle-expand-file-name ("/wingy:tmp" nil))
  tramp-sh-file-name-handler(expand-file-name "/wingy:tmp" nil)
  apply(tramp-sh-file-name-handler expand-file-name ("/wingy:tmp" nil))
  tramp-file-name-handler(expand-file-name "/wingy:tmp" nil)
  expand-file-name("/wingy:tmp" nil)
  apply(expand-file-name ("/wingy:tmp" nil))
  tramp-completion-run-real-handler(expand-file-name ("/wingy:tmp" nil))
  tramp-completion-file-name-handler(expand-file-name "/wingy:tmp" nil)
  get-file-buffer("/wingy:tmp")
  ido-add-virtual-buffers-to-list()
  ido-make-buffer-list(nil)
  ido-read-internal(buffer "Buffer: " ido-buffer-history nil confirm-after-completion nil)
  ido-buffer-internal(raise-frame)
  ido-switch-buffer()
  funcall-interactively(ido-switch-buffer)
  call-interactively(ido-switch-buffer nil nil)
  command-execute(ido-switch-buffer)
08:11:24.329271 tramp-process-actions (1) # File error: Tramp failed to connect.  If this happens repeatedly, try
    ��M-x tramp-cleanup-this-connection��
ssh: Could not resolve hostname wingy: nodename nor servname provided, or not known
08:11:34.629076 tramp-maybe-open-connection (3) # Opening connection for wingy using scp...failed

-- 
-Dave