What could be causing "# Interrupt received in operation"?

[Alex Bennée]

Hi,

I had a working tramp setup with my box but at some point it broke,
possibly with an update to emacs-26.1. Sometimes it starts working again
but I haven't been able to detect a pattern, currently it is hard
broken. I keep seeing a lot of these messages as it attempts to connect:

  11:48:38.338281 tramp-process-one-action (5) # Looking for regexp "\(^[^#$%>
  ]*[#$%>] *\)\'" from remote shell
  11:48:38.338564 tramp-process-one-action (5) # Call ‘tramp-action-succeed’
  11:48:38.338873 tramp-process-actions (6) #
  Linux seed 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3 (2019-02-02) x86_64

  The programs included with the Debian GNU/Linux system are free software;
  the exact distribution terms for each program are described in the
  individual files in /usr/share/doc/*/copyright.

  Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
  permitted by applicable law.
  You have new mail.
  Last login: Tue Mar 12 11:48:11 2019 from 86.152.156.159

  Executing /bin/bash inside dumb (maybe tramp)
  >
  11:48:38.339378 tramp-process-actions (3) # Waiting for prompts from remote 
shell...done
  11:48:38.339839 tramp-maybe-open-connection (3) # Found remote shell prompt 
on ‘torrent’
  11:48:38.341973 tramp-get-remote-stat (5) # Finding a suitable ‘stat’ command
  11:48:38.342253 tramp-send-command (6) # echo \"`getconf PATH 2>/dev/null`\" 
2>/dev/null; echo tramp_exit_status $?
  11:49:51.162637 tramp-get-remote-stat (5) # Finding a suitable ‘stat’ command
  11:49:51.163172 tramp-send-command (6) # echo are you awake
  11:49:54.527772 tramp-file-name-handler (1) # Interrupt received in operation 
(file-attributes /ssh:torrent:/debug.elc string)
  are you awake
  >
  11:49:54.528264 tramp-file-name-handler (1) # Interrupt received in operation 
(file-readable-p /ssh:torrent:/debug.elc)
  are you awake
  >
  11:49:54.528720 tramp-file-name-handler (1) # Interrupt received in operation 
(file-attributes /ssh:torrent:/files-x.elc string)
  are you awake
  >
  11:49:54.529194 tramp-file-name-handler (1) # Interrupt received in operation 
(file-readable-p /ssh:torrent:/files-x.elc)
  are you awake
  >
  11:49:54.529960 tramp-maybe-open-connection (3) # Opening connection for 
torrent using ssh...failed
  11:49:54.532484 tramp-file-name-handler (1) # Interrupt received in operation 
(file-attributes /ssh:torrent:/home/alex/downloads/ string)
  11:49:54.532836 tramp-file-name-handler (1) # Interrupt received in operation 
(file-readable-p /ssh:torrent:/home/alex/downloads/)
  14:47:10.505744 tramp-get-remote-stat (5) # Finding a suitable ‘stat’ command
  14:47:10.506920 tramp-maybe-open-connection (3) # Opening connection for 
torrent using ssh...
  14:47:10.509726 tramp-maybe-open-connection (6) # /bin/sh -i
  14:47:10.512963 tramp-wait-for-regexp (6) #
  #$

The other mode does seem to get prompts back but Tramp missed them:

  14:47:11.206244 tramp-process-actions (6) #
  Linux seed 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3 (2019-02-02) x86_64

  The programs included with the Debian GNU/Linux system are free software;
  the exact distribution terms for each program are described in the
  individual files in /usr/share/doc/*/copyright.

  Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
  permitted by applicable law.
  You have new mail.
  Last login: Tue Mar 12 11:48:38 2019 from 86.152.156.159

  Executing /bin/bash inside dumb (maybe tramp)
  >
  14:47:11.206677 tramp-process-actions (3) # Waiting for prompts from remote 
shell...done
  14:47:11.207095 tramp-maybe-open-connection (3) # Found remote shell prompt 
on ‘torrent’
  14:47:11.208705 tramp-get-remote-stat (5) # Finding a suitable ‘stat’ command
  14:47:11.208915 tramp-send-command (6) # echo \"`getconf PATH 2>/dev/null`\" 
2>/dev/null; echo tramp_exit_status $?
  14:50:43.130900 tramp-file-name-handler (1) # Interrupt received in operation 
(file-attributes /ssh:torrent:/files-x.elc string)
  "/bin:/usr/bin"
  tramp_exit_status 0
  >
  14:50:43.131441 tramp-file-name-handler (1) # Interrupt received in operation 
(file-readable-p /ssh:torrent:/files-x.elc)
  "/bin:/usr/bin"
  tramp_exit_status 0
  >
  14:50:43.132368 tramp-maybe-open-connection (3) # Opening connection for 
torrent using ssh...failed

Any ideas what could be going on?

  ELISP> tramp-version
  "2.3.3.26.1"
  ELISP> emacs-version
  "26.1"

--
Alex Bennée