GNU bug report logs - #54016
29.0.50; TRAMP + sshfs says constantly that file changed

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ergus <spacibba <at> aol.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; TRAMP + sshfs says constantly that file changed 
Date: Tue, 15 Feb 2022 21:17:12 +0100

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
```

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.

I use /scp or /ssh protocols every single day and I don't have this
issue.

Best,
Ergus


In GNU Emacs 29.0.50 (build 69, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, cairo version 1.17.4)
 of 2022-02-15 built on Ergus
Repository revision: 2d573afecb69c7638991c49dad39e414585db13f
Repository branch: master
System Description: Arch Linux

Configured using:
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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Ergus via "Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs <at> gnu.org>
Cc: Ergus <spacibba <at> aol.com>, 54016 <at> debbugs.gnu.org
Subject: Re: bug#54016: 29.0.50; TRAMP + sshfs says constantly that file
 changed
Date: Wed, 16 Feb 2022 09:28:13 +0100

Ergus via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs <at> 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.

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).

> 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.

> Best,
> Ergus

Best regards, Michael.

Message #14 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ergus <spacibba <at> aol.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: "Ergus via Bug reports for GNU Emacs,
 the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>,
 54016 <at> debbugs.gnu.org
Subject: Re: bug#54016: 29.0.50; TRAMP + sshfs says constantly that file
 changed
Date: Wed, 16 Feb 2022 11:57:59 +0100

[Message part 1 (text/plain, inline)]

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 <at> 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 (text/plain, attachment)]

Message #20 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ergus <spacibba <at> aol.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: "Ergus via Bug reports for GNU Emacs,
 the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>,
 54016 <at> debbugs.gnu.org
Subject: Re: bug#54016: 29.0.50; TRAMP + sshfs says constantly that file
 changed
Date: Wed, 16 Feb 2022 12:07:09 +0100

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 <at> 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.
>
>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).
>

1) C-x C-f /sshfs:mn3:/home/ergus/cholesky_ompss2/cholesky_utils.c
2) edit and save (C-x C-f)

3) Try to edit again:

and get the message:

```
cholesky_utils.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.
```

While this is printed in the debug buffer.


```
12:00:00.545261 tramp-handle-lock-file (1) # Quit: "Quit", ""
12:00:11.644888 tramp-get-file-property (8) # /home/ergus/cholesky_ompss2/cholesky_utils.c file-attributes-nil undef; inhibit: t; cache used: nil; cached at: 11:59:49
12:00:11.650265 tramp-get-file-property (8) # /home/ergus/cholesky_ompss2/cholesky_utils.c local-file-name undef; inhibit: t; cache used: nil; cached at: 11:59:49
12:00:11.651051 tramp-get-connection-property (7) # process-buffer nil; cache used: t
12:00:11.651728 tramp-get-connection-property (7) # mount-point nil; cache used: nil
12:00:11.653042 tramp-get-file-property (8) # / mounted nil; inhibit: 10; cache used: nil; cached at: 11:59:41
12:00:11.693504 tramp-fuse-mounted-p (6) # mount -t fuse.sshfs
mn3:/ on /tmp/tramp.sshfs.mn3 type fuse.sshfs (rw,nosuid,nodev,relatime,user_id=1000,group_id=985)
12:00:11.694366 tramp-set-file-property (8) # / mounted mn3:/
12:00:11.695260 tramp-get-connection-property (7) # process-name nil; cache used: nil
12:00:11.695738 tramp-set-connection-property (7) # connected t
12:00:11.696147 tramp-get-connection-property (7) # uid-integer 1000; cache used: t
12:00:11.696682 tramp-get-connection-property (7) # gid-integer 985; cache used: t
12:00:11.697156 tramp-get-connection-property (7) # uid-string ergo; cache used: t
12:00:11.697708 tramp-get-connection-property (7) # gid-string users; cache used: t
12:00:11.698783 tramp-get-connection-property (7) # mount-point nil; cache used: nil
12:00:11.700314 tramp-set-file-property (8) # /home/ergus/cholesky_ompss2/cholesky_utils.c local-file-name /tmp/tramp.sshfs.mn3/home/ergus/cholesky_ompss2/cholesky_utils.c
12:00:11.901823 tramp-set-file-property (8) # /home/ergus/cholesky_ompss2/cholesky_utils.c file-attributes-nil (nil 1 1000 985 (24621 18268 0 0) (25100 55619 0 0) (25100 55619 0 0) 9971 -rw-r--r-- t 59 44)
12:00:11.905766 tramp-get-file-property (8) # /home/ergus/cholesky_ompss2/cholesky_utils.c file-attributes-nil (nil 1 1000 985 (24621 18268 0 0) (25100 55619 0 0) (25100 55619 0 0) 9971 -rw-r--r-- t 59 44); inhibit: 120; cache used: t; cached at: 12:00:11
12:00:24.093022 tramp-get-file-property (8) # /home/ergus/cholesky_ompss2/ file-attributes-nil (t 1 1000 985 (25100 55571 0 0) (24778 8283 0 0) (24778 8283 0 0) 4096 drwxr-xr-x t 27 44); inhibit: 120; cache used: t; cached at: 11:58:59
12:00:24.093775 tramp-get-file-property (8) # /home/ergus/cholesky_ompss2/ file-attributes-nil (t 1 1000 985 (25100 55571 0 0) (24778 8283 0 0) (24778 8283 0 0) 4096 drwxr-xr-x t 27 44); inhibit: 120; cache used: t; cached at: 11:58:59
```

This is the output only after 3) The buffer was full of other stuff
before (attached in the previous email)

Message #26 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Ergus <spacibba <at> aol.com>
Cc: "Ergus via Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs <at> gnu.org>, 54016 <at> debbugs.gnu.org
Subject: Re: bug#54016: 29.0.50; TRAMP + sshfs says constantly that file
 changed
Date: Wed, 16 Feb 2022 16:26:08 +0100

[Message part 1 (text/plain, inline)]

Ergus <spacibba <at> aol.com> writes:

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.
>>
>>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).
>>
>
> 1) C-x C-f /sshfs:mn3:/home/ergus/cholesky_ompss2/cholesky_utils.c
> 2) edit and save (C-x C-f)
>
> 3) Try to edit again:
>
> and get the message:
>
> ```
> cholesky_utils.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.
> ```
>
> While this is printed in the debug buffer.

Thanks for the recipe and the traces. Finally, I could reproduce the
problem locally, it was due to a missing update of the buffer's
modification time. The appended patch fixes this for me, could you pls
test?

Best regards, Michael.

[Message part 2 (text/x-patch, attachment)]

Message #32 received at 54016 <at> debbugs.gnu.org (full text, mbox):

From: Ergus <spacibba <at> aol.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: "Ergus via Bug reports for GNU Emacs,
 the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>,
 54016 <at> debbugs.gnu.org
Subject: Re: bug#54016: 29.0.50; TRAMP + sshfs says constantly that file
 changed
Date: Wed, 16 Feb 2022 18:59:43 +0100

On Wed, Feb 16, 2022 at 04:26:08PM +0100, Michael Albinus wrote:
>Ergus <spacibba <at> aol.com> writes:
>
>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.
>>>
>>>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).
>>>
>>
>> 1) C-x C-f /sshfs:mn3:/home/ergus/cholesky_ompss2/cholesky_utils.c
>> 2) edit and save (C-x C-f)
>>
>> 3) Try to edit again:
>>
>> and get the message:
>>
>> ```
>> cholesky_utils.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.
>> ```
>>
>> While this is printed in the debug buffer.
>
>Thanks for the recipe and the traces. Finally, I could reproduce the
>problem locally, it was due to a missing update of the buffer's
>modification time. The appended patch fixes this for me, could you pls
>test?
>
>Best regards, Michael.
>

Hi:

The patch seems to solve the issue for me.

Feel free to close the issue.

Very thanks!!
Ergus

Message #40 received at 54016-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Ergus <spacibba <at> aol.com>
Cc: 54016-done <at> debbugs.gnu.org, "Ergus via Bug reports for GNU Emacs,
 the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
Subject: Re: bug#54016: 29.0.50; TRAMP + sshfs says constantly that file
 changed
Date: Wed, 16 Feb 2022 20:28:31 +0100

Version: 28.2

Ergus <spacibba <at> aol.com> writes:

> Hi:

Hi,

> The patch seems to solve the issue for me.
>
> Feel free to close the issue.

Thanks for the feedback, I've pushed the patch (slightly enhanced) to
master. Will also appear with Tramp 2.5.2.2, the next GNU ELPA Tramp
release. Closing the bug.

> Very thanks!!
> Ergus

Best regards, Michael.

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