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bug#33135: 27.0.50; (make-thread) TRAMP interactive freeze macOS 10.14


From: Christian Johansson
Subject: bug#33135: 27.0.50; (make-thread) TRAMP interactive freeze macOS 10.14
Date: Thu, 25 Oct 2018 07:08:58 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

Hi Michael

Alright, I'll check out that branch and continue testing here. Asynchronous TRAMP via FTP/SSH without user-interaction seems to work on master branch most of the time but I have experienced some occasional crashes that you don't get when running synchronously. Will start Emacs from my terminal to see if I get any errors there if it crashes

Regards
Christian

On 2018-10-24 13:12, Michael Albinus wrote:
Alan Third <address@hidden> writes:

Hi!
Hi,

Steps to reproduce:
1. Open Emacs without any configuration: src/emacs -Q
2. Make sure you are in *scratch* buffer
3. Paste following Emacs Lisp code:

;; FTP URL: ftp.dlptest.com or ftp://ftp.dlptest.com/
;; FTP User: address@hidden
;; Password: e73jzTRTNqCN9PYAAjjn
(make-thread (lambda()
                (message "Listing directory files..")
                (let ((files (directory-files
"/ftp:address@hidden@ftp.dlptest.com:/")))
                  (message "Opened directory")
                  (message "Directory files: %s" files))))

4. Run M-x eval-buffer
5. Emacs asks for FTP password, paste in mini-buffer: e73jzTRTNqCN9PYAAjjn
6. Emacs now hangs, asks for password again and you can't stop it using C-g.
You get error in terminal:
The NS port currently doesn’t handle interactive functions from
threads very well. I suspect the problem is being caused by displaying
a message from the background thread.
It's not only the NS port. There is a git branch
feature/tramp-thread-safe dedicated to make Tramp thread-safe. However,
this doesn't work well yet, see for example bug#25214 / bug#32426.

Furthermore, the "ftp" method navigates from Tramp to Ange-FTP. I
haven't tested this for being thread-safe; given that nobody has worked
on this I would expect even more problems.

Anyway, if you intend to continue to test this functionality, I
recommend you to use the said branch. There are changes which make file
visiting commands async aware, via a prefix command.  "C-x & C-x C-f ..."
is supposed to visit files asynchronously. This works for both local
files and remote files; but for local files you'll see the difference
for large files only.

Best regards, Michael.





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