GNU bug report logs - #28596
Gnus gets into an ambiguous plugged/unplugged state that prevents retrieval of news

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Package: emacs; Reported by: nljlistbox2@HIDDEN (N. Jackson); dated Mon, 25 Sep 2017 15:02:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Changed bug title to 'Gnus gets into an ambiguous plugged/unplugged state that prevents retrieval of news' from '26.0.60; [Gnus] Checking mail is no longer reliable and C-g no longer quits' Request was from nljlistbox2@HIDDEN (N. Jackson) to control <at> debbugs.gnu.org. Full text available.

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From: nljlistbox2@HIDDEN (N. Jackson)
To: 28596 <at> debbugs.gnu.org
Subject: Re: bug#28596: Gnus gets into an ambiguous plugged/unplugged state
 that prevents retrieval of news
References: <87k20mq0uq.fsf@HIDDEN> <83tvzl98fe.fsf@HIDDEN>
 <87efqppm4p.fsf@HIDDEN>
 <87bmlt76uw.fsf@HIDDEN> <831skd110u.fsf@HIDDEN>
 <87wp22xvn8.fsf@HIDDEN>
Date: Mon, 11 Dec 2017 12:58:07 -0500
In-Reply-To: <87wp22xvn8.fsf@HIDDEN> (N. Jackson's message of
 "Mon, 04 Dec 2017 12:14:51 -0500")
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retitle 28596 Gnus gets into an ambiguous plugged/unplugged state that prevents retrieval of news
quit

I am re-titling the bug report, because as far as I can see, the
bug is not about retrieving mail, only news; and also I'm
increasingly convinced that the hang I was observing when I first
reported the bug was simply because while I was trying to
extricate Gnus from it's confused/broken state I failed to follow
the protocols I usually follow to prevent being bitten by Bug
16026/16906 (which causes a hang).

Also, I now have a recipe that seems to reproduce the bug reliably
here, but it is by no means a minimal recipe:

1. Turn off Internet connection.
2. Start Emacs (26.0.90 pretest)
3. Start Gnus with `gnus-unplugged'
4. Retrieve mail from my local IMAP server with `g' command (`gnus-group-get-new-news')
5. Restore connectivity to Internet
6. (Try to) put Gnus into plugged state with `J j' (`gnus-agent-toggle-plugged')

Result: Mode line now says "Plugged" instead of "Unplugged" but
nntp servers cannot be put in an Open state. Rather agentised
servers can be either Closed or Offline and unagentised servers
can be either Closed or Denied.

At 12:14 -0500 on Monday 2017-12-04, N. Jackson wrote:
> However, I had forgotten (or never saw) your suggestions to
>
>   "try setting url-asynchronous to nil when fetching news... [o]r
>   maybe even build Emacs with HAVE_GETADDRINFO_A undefined"
>
> and I will try that with 26.0.90 these next days.

Following up on this (negatively) for completeness:

1. I restarted Emacs and then set `url-asynchronous' to nil, but
no, this did not prevent Gnus from getting into the
confused/broken state.

2. I also re-built the pretest (26.0.90) with HAVE_GETADDRINFO_A
undefined, but no, that did not prevent the bug from manifesting
either.

N.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: nljlistbox2@HIDDEN (N. Jackson), Lars Ingebrigtsen <larsi@HIDDEN>
In-reply-to: <87wp22xvn8.fsf@HIDDEN> (nljlistbox2@HIDDEN)
Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
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> From: nljlistbox2@HIDDEN (N. Jackson)
> Cc: eric@HIDDEN,  28596 <at> debbugs.gnu.org
> Date: Mon, 04 Dec 2017 12:14:51 -0500
> 
> Hello Eli,
> 
> At 19:40 +0200 on Saturday 2017-12-02, Eli Zaretskii wrote:
> >
> > Any news on this? Is this problem still present in the Emacs
> > 26.0.90 pretest?
> 
> Yes, the problem is still present with the 26.0.90 pretest. I ran
> that for three weeks and the problem happened almost every day.
> 
> Then I went back to using Emacs 25 out of frustration.
> 
> No, sorry, no news. I wasn't able to get any traction on debugging
> it; that would be so much easier if the code were in C! (I am
> perennially unsuccessful when I try to get the Elisp debugger to
> function the way I think it ought to, probably because I don't
> understand the way it is supposed to work.)
> 
> However, I had forgotten (or never saw) your suggestions to
> 
>   "try setting url-asynchronous to nil when fetching news... [o]r
>   maybe even build Emacs with HAVE_GETADDRINFO_A undefined"
> 
> and I will try that with 26.0.90 these next days.
> 
> Additionally, I am almost convinced that the problem is that Gnus
> gets into an ambiguous state where part of it thinks it is
> "unplugged" and part of it thinks it's "plugged", and that it
> never even tries to retrieve the news in the cases where it seems
> to be "broken".
> 
> Furthermore, I now believe that the hang that I had been observing
> was just Bug 16026 / Bug 16906 and that I failed to recognise it
> because I was too confused by the strange behaviour resulting from
> this current bug.

Lars, can you help us here?  I'd hate to release Emacs 26.1 with this
annoying problem.  Can we do something to have a solution or at least
a reasonably convenient band-aid?

Thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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From: nljlistbox2@HIDDEN (N. Jackson)
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
References: <87k20mq0uq.fsf@HIDDEN> <83tvzl98fe.fsf@HIDDEN>
 <87efqppm4p.fsf@HIDDEN>
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Date: Mon, 04 Dec 2017 12:14:51 -0500
In-Reply-To: <831skd110u.fsf@HIDDEN> (Eli Zaretskii's message of "Sat, 02 Dec
 2017 19:40:33 +0200")
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Hello Eli,

At 19:40 +0200 on Saturday 2017-12-02, Eli Zaretskii wrote:
>
> Any news on this? Is this problem still present in the Emacs
> 26.0.90 pretest?

Yes, the problem is still present with the 26.0.90 pretest. I ran
that for three weeks and the problem happened almost every day.

Then I went back to using Emacs 25 out of frustration.

No, sorry, no news. I wasn't able to get any traction on debugging
it; that would be so much easier if the code were in C! (I am
perennially unsuccessful when I try to get the Elisp debugger to
function the way I think it ought to, probably because I don't
understand the way it is supposed to work.)

However, I had forgotten (or never saw) your suggestions to

  "try setting url-asynchronous to nil when fetching news... [o]r
  maybe even build Emacs with HAVE_GETADDRINFO_A undefined"

and I will try that with 26.0.90 these next days.

Additionally, I am almost convinced that the problem is that Gnus
gets into an ambiguous state where part of it thinks it is
"unplugged" and part of it thinks it's "plugged", and that it
never even tries to retrieve the news in the cases where it seems
to be "broken".

Furthermore, I now believe that the hang that I had been observing
was just Bug 16026 / Bug 16906 and that I failed to recognise it
because I was too confused by the strange behaviour resulting from
this current bug.

N.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: nljlistbox2@HIDDEN (N. Jackson)
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Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
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> From: nljlistbox2@HIDDEN (N. Jackson)
> Date: Fri, 29 Sep 2017 13:27:35 -0400
> Cc: Eli Zaretskii <eliz@HIDDEN>, 28596 <at> debbugs.gnu.org
> 
> At 10:13 -0400 on Tuesday 2017-09-26, N. Jackson wrote:
> >
> > The problem can be easily seen in the *Server* buffer. All my
> > nntp servers are broken.
> >
> > - The nntp servers that are managed by the Agent are in an
> >   "offline" state even though Gnus is currently plugged (and I
> >   have a good Internet connection), and the `O', `C' and `R'
> >   (open, close, and reset all) commands have not effect. (Toggling
> >   the plugged/unplugged state a few times hasn't changed this
> >   brokenness.)
> >
> > - The nntp servers that are not managed by the Agent are in a
> >   "denied" state and the `O', `C' and `R' (open, close, and reset
> >   all) commands have not effect.
> 
> It almost seems as if Gnus is in an "unplugged" state even though
> in the mode line it says that it's "plugged". (Toggling the
> plugged/unplugged state so that the mode line says it's
> "unplugged" doesn't help though.)
> 
> One reason why I think Gnus is actually "unplugged" is that when I
> enter a news group that is managed by the Agent when Gnus is
> "unplugged", the *Summary* buffer is displayed almost instantly.
> In contrast when Gnus is not in a "broken" state and is "plugged",
> loading the *Summary* buffer is slow as Gnus will retrieve headers
> over the Internet,
> 
> A second reason why I think Gnus is actually "unplugged" is that
> there are lines in news group *Summary* buffers like
> 
>   - .│0.0k│1969-12-31 19:00│ ▣ Gnus Agent               [Undownloaded article 218857]
> 
> which I would normally only see when Gnus is "unplugged".
> 
> I have now restarted Emacs to get Gnus back into a working state
> -- I have to get real work done. I will report more when I have
> time to investigate a "broken" instance of Gnus more thoroughly.

Any news on this?  Is this problem still present in the Emacs 26.0.90
pretest?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

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Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
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nljlistbox2@HIDDEN (N. Jackson) writes:

> At 08:20 -0700 on Friday 2017-09-29, Eric Abrahamsen wrote:
>>
>> Eli Zaretskii <eliz@HIDDEN> writes:
>>>
>>> Does gnus-group-get-new-news use any of the url-* functions? If
>>> so, perhaps try setting url-asynchronous to nil when fetching
>>> news, to see if that solves the problem. Or maybe even build
>>> Emacs with HAVE_GETADDRINFO_A undefined, and see if that helps.
>>
>> FWIW, I would put money on `nntp-open-connection' being the
>> culprit, specifically the call to `open-network-stream'.
>
> Eli and Eric, than you for these suggestions. I will have a look
> in these directions the next time Gnus "breaks". (I hadn't yet
> read them when I wrote the report below.)

[...]

>   Debugger entered--Lisp error: (error "something.com/443 Name or service not known")
>     signal(error ("something.com/443 Name or service not known"))
>     nnrss-fetch("https://something.com/boards/forums/support.246/index.rss")

My suggestion was probably a red herring after all -- nnrss-fetch
does indeed end up calling url-* functions.

[...]

> However, fetching mail/news was still broken -- no hang this time,
> just nothing seeming to happen. And the *Server* buffer was messed
> up as I previously described:

No clue here, unfortunately.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

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From: nljlistbox2@HIDDEN (N. Jackson)
To: Eric Abrahamsen <eric@HIDDEN>
Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
References: <87k20mq0uq.fsf@HIDDEN> <83tvzl98fe.fsf@HIDDEN>
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At 08:20 -0700 on Friday 2017-09-29, Eric Abrahamsen wrote:
>
> Eli Zaretskii <eliz@HIDDEN> writes:
>>
>> Does gnus-group-get-new-news use any of the url-* functions? If
>> so, perhaps try setting url-asynchronous to nil when fetching
>> news, to see if that solves the problem. Or maybe even build
>> Emacs with HAVE_GETADDRINFO_A undefined, and see if that helps.
>
> FWIW, I would put money on `nntp-open-connection' being the
> culprit, specifically the call to `open-network-stream'.

Eli and Eric, than you for these suggestions. I will have a look
in these directions the next time Gnus "breaks". (I hadn't yet
read them when I wrote the report below.)

Gnus "broke" again this morning. (It seems to break in the morning
when I switch it to the "plugged" state after I've have it
"unplugged" over night for offline reading.)

Unfortunately there are at least two different problems, although
they might be related.

(The following all applies to the Emacs session this morning with
Gnus in it's "broken" state.)

I set `debug-on-error' and got the following (redacted) backtrace
when fetching mail/news:

  Debugger entered--Lisp error: (error "something.com/443 Name or service n=
ot known")
    signal(error ("something.com/443 Name or service not known"))
    nnrss-fetch("https://something.com/boards/forums/support.246/index.rss")
    nnrss-check-group("Something Forums: Support" "")
    nnrss-retrieve-groups(("Something Forums: Support" "Something Forums: S=
oftware" "Something Forums: Something Else" "Something Forums: Discussions"=
 "Something Forums: News") "")
    gnus-retrieve-groups(("Something Forums: Support" "Something Forums: So=
ftware" "Something Forums: Something Else" "Something Forums: Discussions" =
"Something Forums: News") (nnrss ""))
    gnus-read-active-file-2(("Something Forums: Support" "Something Forums:=
 Software" "Something Forums: Something Else" "Something Forums: Discussion=
s" "Something Forums: News") (nnrss ""))
    gnus-read-active-for-groups((nnrss "") (("nnrss:Something Forums: Suppo=
rt" 3 ((1 . 9)) ((unexist) (seen (1 . 6))) (nnrss "")) ("nnrss:Something Fo=
rums: Software" 3 ((1 . 1)) ((unexist) (seen 1)) (nnrss "")) ("nnrss:Someth=
ing Forums: Something Else" 3 ((1 . 117)) ((unexist) (seen (1 . 56) (67 . 1=
17))) (nnrss "")) ("nnrss:Something Forums: Discussions" 3 ((1 . 857)) ((un=
exist) (seen (1 . 245) (421 . 857))) (nnrss "")) ("nnrss:Something Forums: =
News" 3 ((1 . 672)) ((unexist) (seen (1 . 168) (282 . 672))) (nnrss ""))) n=
il)
    gnus-get-unread-articles(nil nil nil)
    gnus-group-get-new-news(nil)
    funcall-interactively(gnus-group-get-new-news nil)
    call-interactively(gnus-group-get-new-news nil nil)
    command-execute(gnus-group-get-new-news)

There was no problem with the reported URl; I could open it fine
in a web browser. I changed the "level" of these RSS groups so
that Gnus does not try to check them when it fetches mail and
news. After doing that, I no longer end up in the debugger when
fetching mail/news with `debug-on-error' set. That was the first
problem.

However, fetching mail/news was still broken -- no hang this time,
just nothing seeming to happen. And the *Server* buffer was messed
up as I previously described:

At 10:13 -0400 on Tuesday 2017-09-26, N. Jackson wrote:
>
> The problem can be easily seen in the *Server* buffer. All my
> nntp servers are broken.
>
> - The nntp servers that are managed by the Agent are in an
>   "offline" state even though Gnus is currently plugged (and I
>   have a good Internet connection), and the `O', `C' and `R'
>   (open, close, and reset all) commands have not effect. (Toggling
>   the plugged/unplugged state a few times hasn't changed this
>   brokenness.)
>
> - The nntp servers that are not managed by the Agent are in a
>   "denied" state and the `O', `C' and `R' (open, close, and reset
>   all) commands have not effect.

It almost seems as if Gnus is in an "unplugged" state even though
in the mode line it says that it's "plugged". (Toggling the
plugged/unplugged state so that the mode line says it's
"unplugged" doesn't help though.)

One reason why I think Gnus is actually "unplugged" is that when I
enter a news group that is managed by the Agent when Gnus is
"unplugged", the *Summary* buffer is displayed almost instantly.
In contrast when Gnus is not in a "broken" state and is "plugged",
loading the *Summary* buffer is slow as Gnus will retrieve headers
over the Internet,

A second reason why I think Gnus is actually "unplugged" is that
there are lines in news group *Summary* buffers like

  - .=E2=94=820.0k=E2=94=821969-12-31 19:00=E2=94=82 =E2=96=A3 Gnus Agent  =
             [Undownloaded article 218857]

which I would normally only see when Gnus is "unplugged".

I have now restarted Emacs to get Gnus back into a working state
-- I have to get real work done. I will report more when I have
time to investigate a "broken" instance of Gnus more thoroughly.

N.





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From: Eric Abrahamsen <eric@HIDDEN>
Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
Date: Fri, 29 Sep 2017 08:20:22 -0700
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: nljlistbox2@HIDDEN (N. Jackson)
>> Date: Mon, 25 Sep 2017 11:01:01 -0400
>> 
>> Yesterday I switched from Emacs 25 to the emacs-26 branch. With
>> this Gnus hangs (sometimes) when checking mail/news
>> (`gnus-group-get-new-news') and then C-g no longer quits -- at
>> least not immediately.
>> 
>> The hangs are for long enough for Gnome dialogs to appear saying
>> that Emacs is no longer responding. Eventually control comes back
>> to Emacs but that might be due to repeated presses of C-g.
>
> This could be due to the fact that Emacs 26 uses async communications
> more than previous versions.
>
> Does gnus-group-get-new-news use any of the url-* functions?  If so,
> perhaps try setting url-asynchronous to nil when fetching news, to see
> if that solves the problem.  Or maybe even build Emacs with
> HAVE_GETADDRINFO_A undefined, and see if that helps.

FWIW, I would put money on `nntp-open-connection' being the culprit,
specifically the call to `open-network-stream'. I used to have similar
problems with Gnus connections hanging (including the need to restart
Emacs entirely to "clear" it out), and all my attempts at figuring it
out led me there. Unfortunately Gnus has been behaving pretty well for
me for the past six months to a year, so I might not be much more help
than that. But I remember being suspicious that these problems were
happening right around the time people seemed to be messing with the
behavior of gnutls. Could be a total red herring, though.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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To: nljlistbox2@HIDDEN (N. Jackson)
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Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
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> From: nljlistbox2@HIDDEN (N. Jackson)
> Date: Mon, 25 Sep 2017 11:01:01 -0400
> 
> Yesterday I switched from Emacs 25 to the emacs-26 branch. With
> this Gnus hangs (sometimes) when checking mail/news
> (`gnus-group-get-new-news') and then C-g no longer quits -- at
> least not immediately.
> 
> The hangs are for long enough for Gnome dialogs to appear saying
> that Emacs is no longer responding. Eventually control comes back
> to Emacs but that might be due to repeated presses of C-g.

This could be due to the fact that Emacs 26 uses async communications
more than previous versions.

Does gnus-group-get-new-news use any of the url-* functions?  If so,
perhaps try setting url-asynchronous to nil when fetching news, to see
if that solves the problem.  Or maybe even build Emacs with
HAVE_GETADDRINFO_A undefined, and see if that helps.

(I'm not saying that these should be the solutions for this bug, just
that they might tell us whether the asynchronous communications
features are involved here.)

I think it would also help stepping through the failing functions with
a debugger and seeing which parts of them fail.

Thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.
Added indication that bug 28596 blocks24655 Request was from Eli Zaretskii <eliz@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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From: nljlistbox2@HIDDEN (N. Jackson)
To: Noam Postavsky <npostavs@HIDDEN>
Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
References: <87k20mq0uq.fsf@HIDDEN>
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At 13:14 -0400 on Monday 2017-09-25, Noam Postavsky wrote:
>
> Does 'pkill -SIGUSR2 emacs' help? Otherwise running under gdb and
> hitting C-z at the gdb terminal should give some more info.
>
> (elisp) Error Debugging
>
> -- User Option: debug-on-event
>      If you set =E2=80=98debug-on-event=E2=80=99 to a special event (*not=
e Special
>      Events::), Emacs will try to enter the debugger as soon as it
>      receives this event, bypassing =E2=80=98special-event-map=E2=80=99. =
 At present,
>      the only supported values correspond to the signals =E2=80=98SIGUSR1=
=E2=80=99 and
>      =E2=80=98SIGUSR2=E2=80=99 (this is the default).  This can be helpfu=
l when
>      =E2=80=98inhibit-quit=E2=80=99 is set and Emacs is not otherwise res=
ponding.

Hi Noam,

Thanks for these tips.

I'm now running under GDB but so far today the long hang isn't
happening so I haven't been able to get a backtrace during it.
Nevertheless, after putting Gnus into an unplugged state and then
putting it into the plugged state while my computer was still
disconnected from the Internet, Gnus is now in a broken state even
though I now am connected.

The problem can be easily seen in the *Server* buffer. All my nntp
servers are broken. (My local servers (nnfolder, nndraft, and my
nnimap server on localhost) are fine.)

- The nntp servers that are managed by the Agent are in an
  "offline" state even though Gnus is currently plugged (and I
  have a good Internet connection), and the `O', `C' and `R'
  (open, close, and reset all) commands have not effect. (Toggling
  the plugged/unplugged state a few times hasn't changed this
  brokenness.)

- The nntp servers that are not managed by the Agent are in a
  "denied" state and the `O', `C' and `R' (open, close, and reset
  all) commands have not effect.

And when I say these commands have no effect, they have no effect
at all. No messages are written to the *Messages* buffer even
though I have gnus-verbose and gnus-verbose-backends both set to
10. [The former setting doesn't seem to do anything (hasn't for a
year or two), but the latter normally prints the dialog with the
servers.]

That is, it seems that Gnus is not even trying to talk to these
servers.

It almost seems as if, because they were found once in the Emacs
session not to be accessible, Gnus will never try to talk to them
again until Emacs is restarted, and commands in the *Server*
buffer to open, close etc. these servers are just quietly ignored.

I will report more as I find it, maybe look at the code, possibly
step through it in the debugger. But as my every day workflow is
so much effected by this I might have to go back to Emacs 25 where
these problems don't happen.

N.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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Subject: Re: bug#28596: 26.0.60; [Gnus] Checking mail is no longer reliable
 and C-g no longer quits
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On Mon, Sep 25, 2017 at 11:01 AM, N. Jackson <nljlistbox2@HIDDEN> wrote:
> Yesterday I switched from Emacs 25 to the emacs-26 branch. With
> this Gnus hangs (sometimes) when checking mail/news
> (`gnus-group-get-new-news') and then C-g no longer quits -- at
> least not immediately.

Does 'pkill -SIGUSR2 emacs' help? Otherwise running under gdb and
hitting C-z at the gdb terminal should give some more info.

(elisp) Error Debugging

-- User Option: debug-on-event
     If you set =E2=80=98debug-on-event=E2=80=99 to a special event (*note =
Special
     Events::), Emacs will try to enter the debugger as soon as it
     receives this event, bypassing =E2=80=98special-event-map=E2=80=99.  A=
t present,
     the only supported values correspond to the signals =E2=80=98SIGUSR1=
=E2=80=99 and
     =E2=80=98SIGUSR2=E2=80=99 (this is the default).  This can be helpful =
when
     =E2=80=98inhibit-quit=E2=80=99 is set and Emacs is not otherwise respo=
nding.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

Message received at 28596 <at> debbugs.gnu.org:


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From: nljlistbox2@HIDDEN (N. Jackson)
To: 28596 <at> debbugs.gnu.org
Subject: Re: bug#28596: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
References: <87k20mq0uq.fsf@HIDDEN>
Date: Mon, 25 Sep 2017 13:03:01 -0400
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At 11:01 -0400 on Monday 2017-09-25, N. Jackson wrote:
>
> I think, but am not yet certain, that the problem only occurs when
> checking mail/news after putting Gnus back into the "plugged"
> state after it has been "unplugged". For example, starting Gnus
> with `M-x gnus-unplugged' and then "plugging" it with
> `gnus-agent-toggle-plugged' and then checking mail/news, (maybe)
> seems to create the problem right off the bat.

No. It turns out that this is not sufficient to trigger the bug. But I
still think it might be necessary to have been in the "unplugged" state
for the bug to manifest -- I will report back with more information if
it becomes apparent.

N.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.

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From: nljlistbox2@HIDDEN (N. Jackson)
To: bug-gnu-emacs@HIDDEN
Subject: 26.0.60;
 [Gnus] Checking mail is no longer reliable and C-g no longer quits
Date: Mon, 25 Sep 2017 11:01:01 -0400
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Yesterday I switched from Emacs 25 to the emacs-26 branch. With
this Gnus hangs (sometimes) when checking mail/news
(`gnus-group-get-new-news') and then C-g no longer quits -- at
least not immediately.

The hangs are for long enough for Gnome dialogs to appear saying
that Emacs is no longer responding. Eventually control comes back
to Emacs but that might be due to repeated presses of C-g.

I think, but am not yet certain, that the problem only occurs when
checking mail/news after putting Gnus back into the "plugged"
state after it has been "unplugged". For example, starting Gnus
with `M-x gnus-unplugged' and then "plugging" it with
`gnus-agent-toggle-plugged' and then checking mail/news, (maybe)
seems to create the problem right off the bat.

Once the problem occurs, it does not seem to go away: every
subsequent check for mail/news also hangs in the same way. At this
point restarting Gnus (`gnus-group-restart') does NOT fix the
problem, one has to restart Emacs to get Gnus working again.

One clue might be this warning message I'm seeing sporadically in
the *Messages* buffer when the problem happens: "Server [whatever]
previously determined to be down; not retrying". This doesn't
really make sense; just because it was "down" previously (perhaps
my laptop didn't have an Internet connection then) doesn't mean
that it won't be available now.

Note: This does not seem to be the bug [1][2] that has existed
with Gnus for several years where it hangs checking mail/news
after (for example) moving from one WiFi hotspot to another. With
that problem C-g works instantly and it's easy to understand what
state Gnus is in. (And indeed, I have a command (which closes and
re-opens servers) that works around it.) With the new problem, C-g
doesn't seem to work, and trying to understand the state of Gnus
is very confusing.

N.

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=16026
[2] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=16906


In GNU Emacs 26.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
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/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-processing hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-processing
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-beamer hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-beamer
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-maxima hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-maxima
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-table hides /data/projects/vc/emacs/git/emacs/lisp/org/org-table
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-R hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-R
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-publish hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-publish
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-mscgen hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-mscgen
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-keys hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-keys
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-css hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-css
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-haskell hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-haskell
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-picolisp hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-picolisp
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-timer hides /data/projects/vc/emacs/git/emacs/lisp/org/org-timer
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-feed hides /data/projects/vc/emacs/git/emacs/lisp/org/org-feed
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-emacs-lisp hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-emacs-lisp
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-coq hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-coq
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-J hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-J
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-mhe hides /data/projects/vc/emacs/git/emacs/lisp/org/org-mhe
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-exp hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-exp
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-rmail hides /data/projects/vc/emacs/git/emacs/lisp/org/org-rmail
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-attach hides /data/projects/vc/emacs/git/emacs/lisp/org/org-attach
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-lilypond hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-lilypond
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-version hides /data/projects/vc/emacs/git/emacs/lisp/org/org-version
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-makefile hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-makefile
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-sql hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-sql
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-lob hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-lob
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-abc hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-abc
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-java hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-java
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-shell hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-shell
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-loaddefs hides /data/projects/vc/emacs/git/emacs/lisp/org/org-loaddefs
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-element hides /data/projects/vc/emacs/git/emacs/lisp/org/org-element
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ebnf hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ebnf
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-id hides /data/projects/vc/emacs/git/emacs/lisp/org/org-id
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-crypt hides /data/projects/vc/emacs/git/emacs/lisp/org/org-crypt
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org hides /data/projects/vc/emacs/git/emacs/lisp/org/org
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-plot hides /data/projects/vc/emacs/git/emacs/lisp/org/org-plot
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ruby hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ruby
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-matlab hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-matlab
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-lua hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-lua
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ditaa hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ditaa
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-irc hides /data/projects/vc/emacs/git/emacs/lisp/org/org-irc
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-gnus hides /data/projects/vc/emacs/git/emacs/lisp/org/org-gnus
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-C hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-C
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-lint hides /data/projects/vc/emacs/git/emacs/lisp/org/org-lint
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-comint hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-comint
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-colview hides /data/projects/vc/emacs/git/emacs/lisp/org/org-colview
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-tangle hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-tangle
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-dot hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-dot
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-mobile hides /data/projects/vc/emacs/git/emacs/lisp/org/org-mobile
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-eshell hides /data/projects/vc/emacs/git/emacs/lisp/org/org-eshell
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-sass hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-sass
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-gnuplot hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-gnuplot
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-icalendar hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-icalendar
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-man hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-man
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-capture hides /data/projects/vc/emacs/git/emacs/lisp/org/org-capture
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-plantuml hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-plantuml
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-footnote hides /data/projects/vc/emacs/git/emacs/lisp/org/org-footnote
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-sed hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-sed
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-clock hides /data/projects/vc/emacs/git/emacs/lisp/org/org-clock
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-js hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-js
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-latex hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-latex
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-ascii hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-ascii
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ref hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ref
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-stan hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-stan
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ocaml hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ocaml
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-agenda hides /data/projects/vc/emacs/git/emacs/lisp/org/org-agenda
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-indent hides /data/projects/vc/emacs/git/emacs/lisp/org/org-indent
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-core hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-core
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-pcomplete hides /data/projects/vc/emacs/git/emacs/lisp/org/org-pcomplete
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-datetree hides /data/projects/vc/emacs/git/emacs/lisp/org/org-datetree
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ledger hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ledger
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-shen hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-shen
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-entities hides /data/projects/vc/emacs/git/emacs/lisp/org/org-entities
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-macro hides /data/projects/vc/emacs/git/emacs/lisp/org/org-macro
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-forth hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-forth
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-mouse hides /data/projects/vc/emacs/git/emacs/lisp/org/org-mouse
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-sqlite hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-sqlite
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-org hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-org
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-screen hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-screen
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-asymptote hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-asymptote
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-eval hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-eval
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-archive hides /data/projects/vc/emacs/git/emacs/lisp/org/org-archive
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox hides /data/projects/vc/emacs/git/emacs/lisp/org/ox
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-org hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-org
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-perl hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-perl
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-faces hides /data/projects/vc/emacs/git/emacs/lisp/org/org-faces
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-bbdb hides /data/projects/vc/emacs/git/emacs/lisp/org/org-bbdb
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-compat hides /data/projects/vc/emacs/git/emacs/lisp/org/org-compat
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-lisp hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-lisp
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-install hides /data/projects/vc/emacs/git/emacs/lisp/org/org-install
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-awk hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-awk
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-calc hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-calc
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-inlinetask hides /data/projects/vc/emacs/git/emacs/lisp/org/org-inlinetask
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-table hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-table
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-fortran hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-fortran

Features:
(shadow bbdb-message emacsbug sendmail eieio-opt speedbar sb-image
ezimage dframe help-fns radix-tree smiley gnus-cite gnus-async
gnus-bcklg qp mail-extr gnus-ml disp-table hl-line mm-archive url-http
url-gw url-cache url-auth nnrss mm-url url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
nndraft nnmh utf-7 server pinentry epa-file network-stream nsm starttls
nnfolder bbdb-gnus bbdb-mua nnnil gnus-agent gnus-srvr gnus-score
score-mode nnvirtual gnus-msg nntp gnus-cache cl-extra help-mode
plain-tex ox-koma-letter ox-odt rng-loc rng-uri rng-parse rng-match
rng-dt rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util
ox-icalendar ox-html table ox-beamer ox-latex ox-ascii ox-publish ox
latexenc preview prv-emacs font-latex tex-mode sh-script smie executable
csv-mode sort make-mode tex-buf latex tex-ispell tex-style tex-info tex
dbus xml texinfo view vc-git diff-mode map flyspell ispell pdf-occur
ibuf-ext ibuffer ibuffer-loaddefs tablist tablist-filter
semantic/wisent/comp semantic/wisent semantic/wisent/wisent
semantic/util-modes semantic/util semantic semantic/tag semantic/lex
semantic/fw mode-local cedet pdf-isearch let-alist pdf-misc imenu
pdf-tools compile cus-edit pdf-view bookmark pp pdf-cache pdf-info tq
pdf-util org-contacts org-capture gnus-art mm-uu mml2015 mm-view
mml-smime smime dig mailcap gnus-sum gnus-group gnus-undo gnus-start
gnus-cloud nnimap nnmail mail-source tls gnutls utf7 netrc nnoo
parse-time gnus-spec gnus-int gnus-range message subr-x puny rfc822 mml
mml-sec epa derived epg mm-decode mm-bodies mm-encode mail-parse rfc2231
gmm-utils mailheader gnus-win gnus nnheader org-duration org-eldoc
org-w3m org-rmail org-mhe org-irc org-info org-habit org-gnus gnus-util
rmail rmail-loaddefs rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils org-docview doc-view jka-compr image-mode dired-x dired
dired-loaddefs org-bibtex bibtex org-bbdb org-agenda org-element
avl-tree generator org advice org-macro org-footnote org-pcomplete
org-list org-faces org-entities noutline outline easy-mmode org-version
ob-shell shell pcomplete ob-R ob-python ob-plantuml ob-org ob-gnuplot
ob-ditaa ob-calc calc-store calc-trail calc-ext calc calc-loaddefs
calc-macs ob-awk ob-dot ob-maxima ob-latex ob-emacs-lisp ob ob-tangle
org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint comint
ansi-color ring ob-core ob-eval org-compat org-macs org-loaddefs
format-spec find-func bbdb-anniv diary-lib diary-loaddefs cal-menu
calendar cal-loaddefs bbdb-com crm mailabbrev bbdb bbdb-site timezone
bbdb-loaddefs finder-inf tex-site info package epg-config url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars ido seq byte-opt gv bytecomp byte-compile cconv
edmacro kmacro recentf tree-widget wid-edit easymenu battery time
wheatgrass-theme paren savehist saveplace elec-pair desktop frameset
cl-loaddefs cl-lib delsel cua-base cus-start cus-load time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 682618 99606)
 (symbols 48 110174 2)
 (miscs 40 23304 3937)
 (strings 32 204611 7770)
 (string-bytes 1 6851130)
 (vectors 16 58096)
 (vector-slots 8 1048921 35174)
 (floats 8 513 884)
 (intervals 56 30122 0)
 (buffers 992 106))




Acknowledgement sent to nljlistbox2@HIDDEN (N. Jackson):
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#28596; Package emacs. Full text available.
Please note: This is a static page, with minimal formatting, updated once a day.
Click here to see this page with the latest information and nicer formatting.
Last modified: Mon, 11 Dec 2017 18:00:02 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.