I’m using Emacs version 26.1 installed via homebrew on macOS.
It often hangs while I’m editing a file over ssh using tramp (say, every 20 minutes).
When I hit Ctrl-x-s to save file (or automatic backup is triggered), tramp starts saving file. However, it hangs with a message
Waiting for prompts from remote shell… \
If I hit Ctrl-g, it seems to have no effect. I hit a second Ctrl-g, emacs goes background with a message
zsh: suspended emacs
I tried fg command to bring emacs back to front:
$ fg
[1] + continued emacs
Emacs is resuming after an emergency escape.
Auto-save? (y or n) y
Auto-save done
Abort (and dump core)? (y or n) n
Continuing...
And emacs continues to hang with a blank screen. Thus, the only way I can take is to answer ‘y’ to the second question and abort the Emacs process.
I tried to check the debug buffer of tramp, but I couldn’t read it because there are too many printed lines and the debug buffer does not scroll, and the emacs does not accept any keystroke except Ctrl-g.
I have the following lines in my emacs.el
(require 'tramp)
(setq tramp-default-method "ssh")
(setq tramp-verbose 5)
(add-to-list 'backup-directory-alist
(cons tramp-file-name-regexp nil))
Emacs was working quite well before upgrading. (I don't remember the previous version...)
Do you have any advice or hints? Thanks in advance.
Edit:
Here's backtrace showed when the emacs process is terminated (by answering 'y' to the second question above)
[1] + continued emacs
Emacs is resuming after an emergency escape.
Auto-save? (y or n) y
Auto-save done
Abort (and dump core)? (y or n) y
Fatal error 6: Abort trapMemory^H^H^H^N^P
Backtrace:
0 emacs 0x0000000100096b2d emacs_backtrace + 157
1 emacs 0x000000010007e9cd terminate_due_to_signal + 110
2 emacs 0x00000001000955ba init_baud_rate + 0
3 emacs 0x0000000100087a98 kbd_buffer_nr_stored + 0
4 emacs 0x00000001000965fb deliver_process_signal + 61
5 libsystem_platform.dylib 0x00007fffa595eb3a _sigtramp + 26
6 ??? 0xb0e07c5c8dafe0b2 0x0 + 12745323682414452914
7 emacs 0x000000010013d491 really_call_select + 88
8 emacs 0x000000010013d42f thread_select + 58
9 emacs 0x0000000100124702 wait_reading_process_output + 3244
10 emacs 0x00000001001239f3 Faccept_process_output + 447
11 emacs 0x00000001000eaa8c funcall_subr + 299
12 emacs 0x00000001000ea16f Ffuncall + 653
13 emacs 0x000000010011c258 exec_byte_code + 1563
14 emacs 0x00000001000ea114 Ffuncall + 562
15 emacs 0x000000010011c258 exec_byte_code + 1563
16 emacs 0x00000001000ea114 Ffuncall + 562
17 emacs 0x000000010011c258 exec_byte_code + 1563
18 emacs 0x00000001000ea114 Ffuncall + 562
19 emacs 0x000000010011c258 exec_byte_code + 1563
20 emacs 0x00000001000ea114 Ffuncall + 562
21 emacs 0x000000010011c258 exec_byte_code + 1563
22 emacs 0x00000001000ea114 Ffuncall + 562
23 emacs 0x00000001000e9dfd Fapply + 651
24 emacs 0x00000001000ea16f Ffuncall + 653
25 emacs 0x000000010011c258 exec_byte_code + 1563
26 emacs 0x00000001000ea114 Ffuncall + 562
27 emacs 0x00000001000e9dfd Fapply + 651
28 emacs 0x00000001000ea16f Ffuncall + 653
29 emacs 0x000000010011c258 exec_byte_code + 1563
30 emacs 0x00000001000ea114 Ffuncall + 562
31 emacs 0x00000001000e9dfd Fapply + 651
32 emacs 0x00000001000ea16f Ffuncall + 653
33 emacs 0x000000010011c258 exec_byte_code + 1563
34 emacs 0x00000001000ea114 Ffuncall + 562
35 emacs 0x00000001000e9dfd Fapply + 651
36 emacs 0x00000001000ea16f Ffuncall + 653
37 emacs 0x000000010011c258 exec_byte_code + 1563
38 emacs 0x00000001000ea114 Ffuncall + 562
39 emacs 0x00000001000e9dfd Fapply + 651
40 emacs 0x00000001000ea16f Ffuncall + 653