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This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':


Running "emacs --daemon" from the console to get a persistent emacs
session and then using frames in the X session crashes emacs when the X
session is terminated before all the frames were closed.

This defeats the purpose of the daemon mode for me.  Is it possible to
make it so that the emacs daemon survives the ungraceful removal of
frames?


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.2/etc/DEBUG.


In GNU Emacs 24.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.8.2)
 of 2013-07-15 on buildvm-18.phx2.fedoraproject.org
Configured using:
 `configure '--build=x86_64-redhat-linux-gnu'
 '--host=x86_64-redhat-linux-gnu' '--program-prefix='
 '--disable-dependency-tracking' '--prefix=/usr' '--exec-prefix=/usr'
 '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc'
 '--datadir=/usr/share' '--includedir=/usr/include'
 '--libdir=/usr/lib64' '--libexecdir=/usr/libexec'
 '--localstatedir=/var' '--sharedstatedir=/var/lib'
 '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--with-dbus'
 '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff'
 '--with-xft' '--with-xpm' '--with-x-toolkit=gtk3' '--with-gpm=no'
 '--with-wide-int' 'build_alias=x86_64-redhat-linux-gnu'
 'host_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
 --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic'
 'LDFLAGS=-Wl,-z,relro ''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_GB.utf8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fvwm

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  show-paren-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
O A ESC O B ESC O B ESC O B ESC O B ESC O B ESC O B 
ESC O B ESC O B ESC O B C-x b RET DEL C-x C-s ESC O 
B ESC [ 3 ~ ESC O B ESC [ 3 ~ ESC O B ESC [ 3 ~ ESC 
O B ESC [ 3 ~ C-x C-s ESC O C ESC O C ESC O C ESC O 
C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC 
O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C 
ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC 
O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C 
ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC 
O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C 
ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC 
O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C 
ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC 
O C ESC O C ESC O C ESC O C ESC O C ESC O C ESC O C 
ESC O C DEL ESC O D ESC O C 4 C-x C-s ESC x m a n C-g 
ESC x r e p o r TAB RET

Recent messages:
Desktop: 233 buffers restored.
Loading term/xterm...done
For information about GNU Emacs and the GNU system, type C-h C-a.
byte-code: Beginning of buffer [13 times]
Saving file /home/lee/.fvwm/fvwm-icon-man.fvwm...
Wrote /home/lee/.fvwm/fvwm-icon-man.fvwm
Saving file /home/lee/.fvwm/fvwm-icon-man.fvwm...
Wrote /home/lee/.fvwm/fvwm-icon-man.fvwm
Saving file /home/lee/.fvwm/fvwm-icon-man.fvwm...
Wrote /home/lee/.fvwm/fvwm-icon-man.fvwm
Quit

Load-path shadows:

-- 
Debugger entered--Lisp error: (error "C-c C-c can do nothing useful at
this location")




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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: lee <lee@HIDDEN>
Subject: bug#14958: Acknowledgement (24.2; emacs --daemon crashing when
 X-frames are removed ungracefully)
Message-ID: <handler.14958.B.137485259822032.ack <at> debbugs.gnu.org>
References: <87a9l9iei0.fsf@HIDDEN>
X-Gnu-PR-Message: ack 14958
X-Gnu-PR-Package: emacs
Reply-To: 14958 <at> debbugs.gnu.org
Date: Fri, 26 Jul 2013 15:30:05 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
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14958: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D14958
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems


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X-Loop: help-debbugs@HIDDEN
Subject: bug#14958: 24.2; emacs --daemon crashing when X-frames are removed ungracefully
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lee wrote:

> In GNU Emacs 24.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.8.2)
>  of 2013-07-15 on buildvm-18.phx2.fedoraproject.org

It might help to use the lucid toolkit rather than GTK+.
./configure --with-x-toolkit=lucid

Not sure if Fedora offers that as an alternative (like emacs-nox).





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Glenn Morris <rgm@HIDDEN> writes:

> lee wrote:
>
>> In GNU Emacs 24.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.8.2)
>>  of 2013-07-15 on buildvm-18.phx2.fedoraproject.org
>
> It might help to use the lucid toolkit rather than GTK+.
> ./configure --with-x-toolkit=lucid
>
> Not sure if Fedora offers that as an alternative (like emacs-nox).

At least I don't find it in the packages.  They are strongly orientated
towards gnome, so I'm not surprised.

I pulled from bzr, compiled with lucid and made a test:  Started emacs
in daemon mode, left two frames open and exited fvwm which closes the X
session.

After that, the emacs daemon is unresponsive, i. e. 'emacsclient -nw'
doesn't do anything, and I can only kill the emacs process.


-- 
Debugger entered--Lisp error: (error "C-c C-c can do nothing useful at
this location")




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From: Noam Postavsky <npostavs@HIDDEN>
To: Doug Gilmore <dougjgilmore@HIDDEN>
Subject: Re: bug#23939: Segfault in daemon mode Emacs when detaching an X
 session
References: <CADZFUQZ06gySPwYtR__yVkG1LTKXNNZTHc4cx4OU+Ef74C1t=Q@HIDDEN>
Date: Sun, 05 May 2019 00:15:40 -0400
In-Reply-To: <CADZFUQZ06gySPwYtR__yVkG1LTKXNNZTHc4cx4OU+Ef74C1t=Q@HIDDEN> (Doug
 Gilmore's message of "Sun, 10 Jul 2016 17:00:49 -0700")
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#14958 = emacs --daemon crashing when X-frames are removed ungracefully
#11676 = Daemon crashes when ssh dies
#22174 = emacs --daemon crashes when ssh is disconnected. I am using lucid x toolkit.
merge 14958 11676 22174
#11639 = 24.0.95; Emacs daemon hangs when emacsclient was killed
# probably the GTK thing
merge 11639 8501
quit

Doug Gilmore <dougjgilmore@HIDDEN> writes:

> I have been running my own build of Emacs 24.2 for quite a while in
> daemon mode for quite a while without any problems except that the
> daemon would on rare occasions crash when I detached a windows frame
> via the delete-frame Emacs command.  The other day this happened
> several times in succession when connecting to a daemon running on
> another host and I was able to catch the failure under an attached gdb
> session.  I attached a backtrace and a prototype fix.
>
> I have been building my own Emacs on Ubuntu-12/14 configured with the
> --with-x-toolkit=lucid option, so this is not a Gtk issue.
>
> Has anyone else been seeing this problem?

There are some other reports about Emacs daemon dying when closing X
sessions, but the backtraces look different, so I guess it's not the
same problem.

> #0  x_uncatch_errors () at /scratch/dgilmore/emacs-24.2/src/xterm.c:7672
> #1  0x00000000004cb588 in x_catch_errors_unwind (dummy=<optimized out>) at /scratch/dgilmore/emacs-24.2/src/xselect.c:546
> #2  0x000000000055b4ce in unbind_to (count=<optimized out>, value=11872738) at /scratch/dgilmore/emacs-24.2/src/eval.c:3433
> #3  0x000000000055b6e5 in unwind_to_catch (catch=0x7ffc44910f60, value=<optimized out>) at /scratch/dgilmore/emacs-24.2/src/eval.c:1314
> #4  0x000000000055d5a9 in Fsignal (error_symbol=11924850, data=38401462) at /scratch/dgilmore/emacs-24.2/src/eval.c:1764

> (gdb) p x_error_message
> $1 = (struct x_error_message_stack *) 0x0

> Subject: [PATCH] Make sure x_error_message is not NULL.
>
> Before dereferencing the pointer.

> @@ -7665,6 +7665,14 @@ x_uncatch_errors (void)
>  {
>    struct x_error_message_stack *tmp;
>  
> +  /* In rare situations when running Emacs run in daemon mode,
> +     shutting down an emacsclient via delete-frame can cause
> +     x_uncatch_errors to be called when x_error_message is set to
> +     NULL.  */
> +  
> +  if (x_error_message == NULL)
> +    return;
> +

If this really is possible, I guess a NULL check wouldn't be a bad
thing...





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