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bug#47896: 27.2; TRAMP hang/lockup/fault on compile/file access


From: dag
Subject: bug#47896: 27.2; TRAMP hang/lockup/fault on compile/file access
Date: Thu, 22 Apr 2021 11:10:12 -0500

 
 
 
 
On 2021-04-22 02:32, Michael Albinus <michael.albinus@gmx.de> wrote:

> > Hmm. ssh can't always pass environment variables because the remote
> > admin may have disabled it, so INSIDE_EMACS isn't always reliable. Is
> > testing for TERM == "dumb" sufficient?

> Yes. But I don't know, whether emacs-libvterm does the same setting.

It seems to.  I set the prompt to something really simple: "$ " (debug log snippet below).
However, that didn't seem to help with the lockups.  What *did* seem to help quite
a bit was doing this in my init:
 
; Have compile mode scroll until the first error.
;;(setq compilation-scroll-output 'first-error)
;;(setq compilation-auto-jump-to-first-error 1)
 
I've been meaning to disable those anyway, but it's a shame these don't seem to work well
with TRAMP.  Now lockups that need "kill -SIGUSR2" are pretty rare (though they do
happen occasionally).  I do still need the to <quit> every now and then, which is annoying
but not nearly as annoying as before.
 
I do still get hangs on "decoding remote file..." and if I <quit>, visit the resulting buffer
(which may or may not be empty) and <find-alternate-file> it will reload without issue.
Again, annoying but not a showstopper.
 
I haven't yet tried emacs 28 to see if the above fixes the signal-9-terminated compiles.
 
David
 
11:01:33.141006 tramp-process-actions (3) # Waiting for prompts from remote shell...done
11:01:33.141091 tramp-maybe-open-connection (3) # Found remote shell prompt on ‘dgreene-dev’
11:01:33.141157 tramp-open-shell (5) # Opening remote shell ‘/bin/sh’...
11:01:33.141223 tramp-send-command (6) # exec env TERM='dumb' INSIDE_EMACS='27.2,tramp:2.4.5.27.2' ENV='' HISTFILE=~/.tramp_history PROMPT_COMMAND='' PS1=\#\$\ PS2='' PS3='' /bin/sh 
11:01:33.202768 tramp-wait-for-regexp (6) # 
#$ 
11:01:33.202879 tramp-send-command (6) # (cd ~/) 2>/dev/null; echo tramp_exit_status $?
11:01:33.258755 tramp-wait-for-regexp (6) # 
tramp_exit_status 0
#$ 
11:01:33.258876 tramp-open-shell (5) # Opening remote shell ‘/bin/sh’...done
11:01:33.258970 tramp-open-connection-setup-interactive-shell (5) # Setting up remote shell environment
11:01:33.259039 tramp-send-command (6) # set +o vi +o emacs
11:01:33.313578 tramp-wait-for-regexp (6) # 
#$ 
11:01:33.313763 tramp-send-command (6) # stty -inlcr -onlcr -echo kill '^U' erase '^H'
11:01:33.368599 tramp-wait-for-regexp (6) # 
#$ 
11:01:33.368721 tramp-send-command (6) # echo foo
11:01:33.423097 tramp-wait-for-regexp (6) # 
foo
#$ 
11:01:33.423252 tramp-open-connection-setup-interactive-shell (5) # Setting shell prompt
11:01:33.423416 tramp-send-command (6) # PS1=///e9364282a97cbba0d7fbd76f9c2169f1\#\$ PS2='' PS3='' PROMPT_COMMAND=''
11:01:33.475982 tramp-wait-for-regexp (6) # 
///e9364282a97cbba0d7fbd76f9c2169f1#$
11:01:33.476293 tramp-open-connection-setup-interactive-shell (5) # Checking system information
11:01:33.476541 tramp-send-command (6) # echo \"`uname -sr`\" 2>/dev/null; echo tramp_exit_status $?
11:01:33.530843 tramp-wait-for-regexp (6) # 
"Linux 3.10.0-1127.19.1.el7.x86_64"
tramp_exit_status 0
///e9364282a97cbba0d7fbd76f9c2169f1#$
 

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