bug#50205: 27.2; crashes or hangs when opening a specific file using tramp

[Mani Kancherla]

Hi Michael,

Sorry, it took me some time to get back to you. I asked one of my colleagues to try it on her MAC.

We installed emacs 27.2 on that MAC first and then tramp 2.5.1, verified that tramp 2.5.1 is loaded

with M-x tramp-version and then we could easily reproduce the issue.

I also suspect that it is related to tramp on MAC. I had been using emacs and tramp for a few years

without trouble and I think the issues started last year. I don't remember if it was after I upgraded my

MAC to the latest version at that time.

What I noticed is that, occasionally, sometimes within an hour and sometimes after a couple of days, emacs

crashes. I tried upgrading MAC OS, emacs, tramp and nothing helped. Then I tried to narrow it down

so I could consistently reproduce it.

Switching to the built-in 2.4.5.27.2 helped, i.e. reduced the frequency of crashes significantly and also I

don't see the issue with the specific file that I could reproduce the issue with consistently. However, I still see

emacs crashing occasionally. I am trying to run it in debugger and see if I can gather useful info.

Thanks,

Mani

On Sat, Sep 4, 2021 at 12:06 AM Michael Albinus <michael.albinus@gmx.de> wrote:

Mani Kancherla <kancherla.mani@gmail.com> writes:

> Hi Michael,

Hi Mani,

> I followed the steps and could successfully compile using "M-x
> tramp-recompile-elpa" and restart emacs after that (without -L ~
> /.emacs.d/elpa/tramp-2.5.1.1 -l tramp). I verified that it is running
> tramp version 2.5.1.1 with M-x tramp-version.

Good.

> I still see the problem with this. I open that specific problematic
> file and split the window, it hangs.

Just to be sure, I reran your test, again. No problem.

You said that you're on macOS, while I'm using GNU/Linux. Perhaps this
makes the difference, and we see an error of Emacs' thread
implementation on macOS.

It would be helpful, if somebody else could run your test on macOS,
using the Tramp ELPA package, for verification.

> Thanks,
> Mani

Best regards, Michael.