GNU bug report logs - #34196
27.0.50; tramp hangs on wrong password with global-auto-revert-mode

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

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.50; tramp hangs on wrong password with global-auto-revert-mode
Date: Fri, 25 Jan 2019 07:36:23 -0800

repro.el:

(global-auto-revert-mode t)

emacs -Q -l repro.el

C-x C-f

/sudo::/

Enter the wrong password. Try entering the wrong password again (type
maybe 10 characters)

Expected:

Emacs does not hang and I can keep typing, hit enter and then try again.

Actual:

Emacs hangs after a few characters.


In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin18.2.0, NS appkit-1671.10 Version 10.14.1 (Build 18B75))
 of 2018-12-04 built on aaron-mbt.local
Repository revision: 12e922156c86a26fa4bb2cb9e7d2b3fd639e4707
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.2

Recent messages:
Analyzing the buffer...done
Guessing...done
Local rules set
Appointment reminders enabled (no diary file found)
Added 2 events for today
Saving file /Users/aaronjensen/.emacs.d/.cache/work.org...
Wrote /Users/aaronjensen/.emacs.d/.cache/work.org
Showing all blocks ... done
Showing all blocks ... done
Added 2 events for today

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs-plus/HEAD-12e9221/share/info/emacs
 --prefix=/usr/local/Cellar/emacs-plus/HEAD-12e9221 --with-xml2
 --without-dbus --with-gnutls --with-imagemagick --with-modules
 --with-rsvg --with-ns --disable-ns-self-contained'

Configured features:
RSVG IMAGEMAGICK GLIB NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS NS MODULES THREADS LCMS2 GMP

Important settings:
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Major mode: Emacs-Lisp

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Message #8 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: 34196 <at> debbugs.gnu.org
Subject: Re: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Sun, 27 Jan 2019 06:34:16 -0800

It appears that the hang happens when (expand-file-name
default-directory) is hit within auto-revert-notify-add-watch for the
tramp buffer: /sudo:root <at> myhost.local

I wonder if it's essentially trying to recursively make that tramp
connection or something along those lines?

Here's the *Messages* buffer:

Tramp: Opening connection for root <at> myhost.local using sudo...
Tramp: Sending command ‘exec env SHELL=/bin/sh sudo -u root -s -H -p
P""a""s""s""w""o""r""d"":’
Tramp: Waiting for prompts from remote shell...
Tramp: Sending Password
expand-file-name: #("/sudo:root <at> myhost.local:" 6 10 (tramp-default t)
11 26 (tramp-default t))
Quit
Tramp: Waiting for prompts from remote shell...failed
Tramp: Opening connection for root <at> aaron-mbt.local using sudo...failed
Quit [15 times]

You can see where the expand-file-name happens. I believe that's where
it hangs. Spamming C-g gets out of it.

I have no idea what the right fix is for this, hopefully someone with
more tramp or auto-revert familiarity has an idea.

Thanks,

Aaron

Message #11 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: 34196 <at> debbugs.gnu.org
Subject: Re: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Sun, 27 Jan 2019 06:52:58 -0800

On Sun, Jan 27, 2019 at 6:34 AM Aaron Jensen <aaronjensen <at> gmail.com> wrote:
>
> It appears that the hang happens when (expand-file-name
> default-directory) is hit within auto-revert-notify-add-watch for the
> tramp buffer: /sudo:root <at> myhost.local

For now, I am working around this with:

(add-to-list 'global-auto-revert-ignore-modes 'fundamental-mode)

Though that doesn't seem like it should be necessary.

Aaron

Message #14 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Sun, 27 Jan 2019 18:25:14 +0100

Aaron Jensen <aaronjensen <at> gmail.com> writes:

Hi Aaron,

>> It appears that the hang happens when (expand-file-name
>> default-directory) is hit within auto-revert-notify-add-watch for the
>> tramp buffer: /sudo:root <at> myhost.local
>
> For now, I am working around this with:
>
> (add-to-list 'global-auto-revert-ignore-modes 'fundamental-mode)
>
> Though that doesn't seem like it should be necessary.

For the records, I've seen the bug report, and I could reproduce
it. Since I'm in a transition phase with Tramp, reworking
accept-process-output usage, it will take some days until I could
handle. Don't despair :-)

> Aaron

Best regards, Michael.

Message #17 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Mon, 04 Feb 2019 16:06:58 +0100

Michael Albinus <michael.albinus <at> gmx.de> writes:

Hi Aaron,

>>> It appears that the hang happens when (expand-file-name
>>> default-directory) is hit within auto-revert-notify-add-watch for the
>>> tramp buffer: /sudo:root <at> myhost.local

> For the records, I've seen the bug report, and I could reproduce
> it. Since I'm in a transition phase with Tramp, reworking
> accept-process-output usage, it will take some days until I could
> handle. Don't despair :-)

Finally, I found the time to dig into this. I've pushed a fix to master
(disable `global-auto-revert-mode' temporarily). Could you, pls, recheck?

>> Aaron

Best regards, Michael.

Message #22 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 05 Feb 2019 13:51:31 +0100

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

Aaron Jensen <aaronjensen <at> gmail.com> writes:

Hi Aaron,

[Pls keep the Cc, for the archives]

> I think that not-yet-connected tramp buffers need to be excluded from
> garm entirely, if that is possible.

Good idea. I've appended a patch, which reverts the last change from
tramp.el, and implements your proposal in autorevert.el. This is also
better, because Tramp as library shouldn't care about auto-revert.

Could you, pls, check whether this works for you?

> Thanks,
>
> Aaron

Best regards, Michael.

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

Message #25 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 5 Feb 2019 08:43:52 -0800

On Tue, Feb 5, 2019 at 4:51 AM Michael Albinus <michael.albinus <at> gmx.de> wrote:
>
> [Pls keep the Cc, for the archives]

Sorry, clicked the wrong button, thank you for the reminder.

> > I think that not-yet-connected tramp buffers need to be excluded from
> > garm entirely, if that is possible.
>
> Good idea. I've appended a patch, which reverts the last change from
> tramp.el, and implements your proposal in autorevert.el. This is also
> better, because Tramp as library shouldn't care about auto-revert.
>
> Could you, pls, check whether this works for you?

It works brilliantly as far as I can tell in both emacs -Q and my config.

Is there any cost to an extra loop over all buffers and doing
with-current-buffer?

I wonder if a change to auto-revert-active-p would be better than
looping through all of the buffers and with-current-buffering them
again. I don't know if that's semantically wrong for that function.

Another option is putting a check in auto-revert-notify-add-watch,
since that already has checks to ensure the file is okay to be
watched:

          (or auto-revert-notify-watch-descriptor
              (and (file-remote-p default-directory)
                   (not (file-remote-p default-directory nil t)))
              (string-match auto-revert-notify-exclude-dir-regexp
                            (expand-file-name default-directory))
              (file-symlink-p (or buffer-file-name default-directory)))

With that in place, even if I enable auto-revert-remote-files I don't
experience the hang.

Thanks,

Aaron

Message #28 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 05 Feb 2019 18:59:16 +0100

Aaron Jensen <aaronjensen <at> gmail.com> writes:

Hi Aaron,

> Is there any cost to an extra loop over all buffers and doing
> with-current-buffer?

There is cost, but not too much. `file-remote-p' doesn't go remote, and
it is fast:

(let ((default-directory "/sudo::"))
  (benchmark 1000 (with-temp-buffer (file-remote-p default-directory))))
=> Elapsed time: 0.000060s

> I wonder if a change to auto-revert-active-p would be better than
> looping through all of the buffers and with-current-buffering them
> again. I don't know if that's semantically wrong for that function.

I've played with this idea as well. But the call is much too late for
our purposes (somewhere in the middle of auto-revert-buffers)

> Another option is putting a check in auto-revert-notify-add-watch,
> since that already has checks to ensure the file is okay to be
> watched:
>
>           (or auto-revert-notify-watch-descriptor
>               (and (file-remote-p default-directory)
>                    (not (file-remote-p default-directory nil t)))
>               (string-match auto-revert-notify-exclude-dir-regexp
>                             (expand-file-name default-directory))
>               (file-symlink-p (or buffer-file-name default-directory)))
>
> With that in place, even if I enable auto-revert-remote-files I don't
> experience the hang.

Yes, I've played with this also. auto-revert-notify-add-watch comes in
place when file notification is used. That's not the case, always.

So I tend to push my patch, if nobody complains. Let's sleep over this :-)

> Thanks,
>
> Aaron

Best regards, Michael.

Message #31 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 5 Feb 2019 10:14:10 -0800

On Tue, Feb 5, 2019 at 9:59 AM Michael Albinus <michael.albinus <at> gmx.de> wrote:

> Yes, I've played with this also. auto-revert-notify-add-watch comes in
> place when file notification is used. That's not the case, always.

Right, and I think the hang only occurs when that is the case as far
as I can tell. Or were you able to reproduce the hang with file
notification disabled?

> So I tend to push my patch, if nobody complains. Let's sleep over this :-)

It works for me, so I'd be happy with it.

Cheers,

Aaron

Message #34 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 05 Feb 2019 20:22:40 +0100

Aaron Jensen <aaronjensen <at> gmail.com> writes:

Hi Aaron,

>> Yes, I've played with this also. auto-revert-notify-add-watch comes in
>> place when file notification is used. That's not the case, always.
>
> Right, and I think the hang only occurs when that is the case as far
> as I can tell. Or were you able to reproduce the hang with file
> notification disabled?

No, I haven't tried. But auto-revert-notify-add-watch is called after
auto-revert-active-p, so it's not sufficient to test it such late.

> Cheers,
>
> Aaron

Best regards, Michael.

Message #37 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 5 Feb 2019 11:27:06 -0800

On Tue, Feb 5, 2019 at 11:22 AM Michael Albinus <michael.albinus <at> gmx.de> wrote:
>
> No, I haven't tried. But auto-revert-notify-add-watch is called after
> auto-revert-active-p, so it's not sufficient to test it such late.

Not sufficient for what, exactly? Testing it only in
auto-revert-notify-add-watch prevents the hang for me. The only thing
it wouldn't prevent is auto-revert-handler getting called, but that
doesn't seem to have any negative impact as far as I could tell, but I
could be missing an edge case.

Aaron

Message #40 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 05 Feb 2019 21:07:19 +0100

Aaron Jensen <aaronjensen <at> gmail.com> writes:

>> No, I haven't tried. But auto-revert-notify-add-watch is called after
>> auto-revert-active-p, so it's not sufficient to test it such late.
>
> Not sufficient for what, exactly? Testing it only in
> auto-revert-notify-add-watch prevents the hang for me. The only thing
> it wouldn't prevent is auto-revert-handler getting called, but that
> doesn't seem to have any negative impact as far as I could tell, but I
> could be missing an edge case.

As I said earlier, I've tried to add the test in auto-revert-active-p,
and this wasn't successful; the problem still happened.

And auto-revert-notify-add-watch is called only if auto-revert-active-p
returns non-nil.

> Aaron

Best regards, Michael.

Message #43 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Aaron Jensen <aaronjensen <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Tue, 5 Feb 2019 14:41:54 -0800

On Tue, Feb 5, 2019 at 12:07 PM Michael Albinus <michael.albinus <at> gmx.de> wrote:
>
> As I said earlier, I've tried to add the test in auto-revert-active-p,
> and this wasn't successful; the problem still happened.

Got it, I misunderstood and couldn't reproduce with this. Since you
saw it happen w/ that I say we go with your patch. Thanks again!

Aaron

Message #48 received at 34196-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Aaron Jensen <aaronjensen <at> gmail.com>
Cc: 34196-done <at> debbugs.gnu.org
Subject: Re: bug#34196: 27.0.50;
 tramp hangs on wrong password with global-auto-revert-mode
Date: Wed, 06 Feb 2019 09:11:49 +0100

Aaron Jensen <aaronjensen <at> gmail.com> writes:

> Got it, I misunderstood and couldn't reproduce with this. Since you
> saw it happen w/ that I say we go with your patch. Thanks again!

I've pushed the patch to Emacs master (plus some minor cleanups in
Tramp). Closing the bug.

> Aaron

Best regards, Michael.

Message #51 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Alex Branham <alex.branham <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34196 <at> debbugs.gnu.org
Subject: Error in auto-revert-buffers: Wrong type argument
Date: Wed, 13 Feb 2019 13:00:43 -0600

Hi Michael -

The fix for this bug seems to cause issues if default-directory is nil
for any buffer. In particular, you get a wrong type argument where
auto-revert-buffers is expecting a string instead of nil.

This change fixes the issue for me:

Thanks,
Alex

diff --git a/lisp/autorevert.el b/lisp/autorevert.el
index 150693baf1..318b10d4a8 100644
--- a/lisp/autorevert.el
+++ b/lisp/autorevert.el
@@ -773,7 +773,8 @@ the timer when no buffers need to be checked."
                        (mapcar
                         (lambda (buf)
                           (with-current-buffer buf
-                            (and (or (not (file-remote-p default-directory))
+                            (and default-directory
+                                 (or (not (file-remote-p default-directory))
                                      (file-remote-p default-directory nil t))
                                  buf)))
                         bufs)))

Message #54 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Alex Branham <alex.branham <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: Error in auto-revert-buffers: Wrong type argument
Date: Thu, 14 Feb 2019 00:09:14 +0100

Alex Branham <alex.branham <at> gmail.com> writes:

> Hi Michael -

Hi Alex,

> The fix for this bug seems to cause issues if default-directory is nil
> for any buffer. In particular, you get a wrong type argument where
> auto-revert-buffers is expecting a string instead of nil.

Thanks for the report. We could apply your patch of course, but I'm
curious: `default-directory' shall always be set. So I would like to
know where the error comes from.

Could you, pls, set `debug-on-error' to t, and rerun the test? There
should be a backtrace, which might tell us more.

> Thanks,
> Alex

Best regards, Michael.

Message #57 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Alex Branham <alex.branham <at> gmail.com>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: Error in auto-revert-buffers: Wrong type argument
Date: Thu, 14 Feb 2019 11:05:17 -0600

On Wed 13 Feb 2019 at 17:09, Michael Albinus <michael.albinus <at> gmx.de> wrote:

> Thanks for the report. We could apply your patch of course, but I'm
> curious: `default-directory' shall always be set. So I would like to
> know where the error comes from.
>
> Could you, pls, set `debug-on-error' to t, and rerun the test? There
> should be a backtrace, which might tell us more.

I'm not really sure when/how/why default-directory becomes nil. It seems
to happen in non-file-visiting buffers (e.g. *scratch*, *Backtrace*, any
comint buffer, etc) from time to time. I know "from time to time" is
vague; I've had a hard time tracking it down.

I'm using EXWM (not sure if that has anything at all to do with it) and
it seems like it happens when my screen turns off after a period of
inactivity. I'm not really sure how/why Emacs would know about that
though, so perhaps it's totally unrelated.

Thanks,
Alex

Message #60 received at 34196 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Alex Branham <alex.branham <at> gmail.com>
Cc: 34196 <at> debbugs.gnu.org
Subject: Re: bug#34196: Error in auto-revert-buffers: Wrong type argument
Date: Thu, 14 Feb 2019 21:25:38 +0100

Alex Branham <alex.branham <at> gmail.com> writes:

Hi Alex,

> I'm not really sure when/how/why default-directory becomes nil. It seems
> to happen in non-file-visiting buffers (e.g. *scratch*, *Backtrace*, any
> comint buffer, etc) from time to time. I know "from time to time" is
> vague; I've had a hard time tracking it down.
>
> I'm using EXWM (not sure if that has anything at all to do with it) and
> it seems like it happens when my screen turns off after a period of
> inactivity. I'm not really sure how/why Emacs would know about that
> though, so perhaps it's totally unrelated.

I see your point. However, if you keep the debug-on-error setting, the
problem will appear next time, and we can analyze the timestamp.

> Thanks,
> Alex

Best regards, Michael.

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