bug#54016: 29.0.50; TRAMP + sshfs says constantly that file changed

[Ergus]

On Wed, Feb 16, 2022 at 09:28:13AM +0100, Michael Albinus wrote:
> Ergus via "Bug reports for GNU Emacs, the Swiss army knife of text
> editors" <bug-gnu-emacs@gnu.org> writes:
>
> > Hi:
>
> Hi,
>
> > Using tramp+sshfs it works pretty much fine at the beginning but after
> > some minutes it interrupts constantly saying that the file changed on
> > disk and asks for edit confirmation.
> >
> > By constantly I mean every time a new edit is attempt I get this (even
> > several times consecutive).
> >
> > ```
> > Saving file /sshfs:XXX:XXXX
> > benchmarks_ompss.h has changed since visited or saved.  Save anyway? (y or n) y
> > benchmarks_ompss.h changed on disk; really edit the buffer? (y, n, r or C-h) y
> > File on disk now will become a backup file if you save these changes.
> > Wrote /sshfs:XXX:XXXX
> > ```
>
> Well, I would need a recipe to reproduce. Could you run it, when
> tramp-verbose is set to 10? And please tell me at which time the problem
> starts to appear, so I have a chance to find it in the debug buffer.
Hi:

I just open a file with /sshfs: and write something C-x C-s wait some
seconds (10) and then try to write again I get the error.

There is also some threads in stackoverflow mentioning this same issue
trams+sshfs.

https://stackoverflow.com/questions/9387202/emacs-gives-warning-when-trying-to-save-files-over-sshfs

> I know that the debug buffer will be huge after a while, but there is no
> problem if you send it directly to me (or a URL where I could find it).
Attached, the issue appeared after just some seconds this time:

jacobi_task_ompss2.c changed on disk; really edit the buffer? (y, n, r or C-h) y
File on disk now will become a backup file if you save these changes.

> > I have enabled auto revert with this variables since ever:
> >
> > auto-revert-verbose nil
> > auto-revert-avoid-polling t
> >
> > but this is the first time I experiment such issue.
>
> The sshfs Tramp method does not support (remote) file
> notifications. Auto-revert could work only with polling for this method.
I know, that's why I was wondering. Also in my config the
auto-revert-verbose nil reduces the verbosity in general, but I still
get it on tram.

> > Best,
> > Ergus
>
> Best regards, Michael.

debug-tramp-sshfs.log
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