GNU logs - #11639, boring messages

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Subject: bug#11639: 24.0.95; Emacs daemon hangs when emacsclient was killed
Resent-From: Sanel Zukan <sanelz@HIDDEN>
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Date: Wed, 6 Jun 2012 14:56:58 +0200
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From: Sanel Zukan <sanelz@HIDDEN>
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When Emacs was run in daemon mode (emacs --daemon) and client is
connected from terminal
on it (via emacsclient), everything works as expected. However, when X
session is abruptly terminated
killing terminal application where emacsclient is run (like mrxvt or
xterm), emacs daemon is not
responsible any more.

Every further connection to it via emacsclient will hang client
itself. For now, the only solution is to
restart daemon and kill all hung clients.

On other hand, when there are no connections to daemon and X session
was killed, daemon is
working without any issues.

I'm running Emacs on Fedora 17. Below are gathered report from M-x
report-emacs-bug.

Thanks, Sanel

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/24.0.95/etc/DEBUG.

In GNU Emacs 24.0.95.1 (i386-redhat-linux-gnu, GTK+ Version 2.24.10)
 of 2012-04-06 on x86-17.phx2.fedoraproject.org
Configured using:
 `configure '--build=i386-redhat-linux-gnu'
 '--host=i386-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/lib'
 '--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=gtk' '--with-gpm=no' '--with-wide-int'
 'build_alias=i386-redhat-linux-gnu' 'host_alias=i386-redhat-linux-gnu'
 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32
 -march=i686 -mtune=atom -fasynchronous-unwind-tables'
 '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_US
  value of $XMODIFIERS: @im=none
  locale-coding-system: iso-latin-1-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  evil-mode: t
  evil-local-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  tooltip-mode: t
  mouse-wheel-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
  line-number-mode: t
  transient-mark-mode: t

Recent input:
ESC [ > 8 2 ; 0 . 5 . 3 ; 0 c ESC x r DEL b u g TAB
TAB DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL DEL
DEL DEL r e p o TAB TAB r TAB RET

Recent messages:
("emacs")
Loading /usr/share/emacs/site-lisp/site-start.d/emacs-color-theme-init.el
(source)...done
Loading /usr/share/emacs/site-lisp/site-start.d/focus-init.el (source)...done
Loading /usr/share/emacs/site-lisp/site-start.d/php-mode-init.el (source)...done
Loading /usr/share/emacs/site-lisp/site-start.d/rpm-spec-mode-init.el
(source)...done
Starting Emacs daemon.
When done with this frame, type C-x 5 0
Making completion list... [2 times]

Load-path shadows:

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Sanel Zukan <sanelz@HIDDEN>
Subject: bug#11639: Acknowledgement (24.0.95; Emacs daemon hangs when
 emacsclient was killed)
Message-ID: <handler.11639.B.1338999428685.ack <at> debbugs.gnu.org>
References: <CAHuZ_kvqzpD+E7yHWhRsMSF5F8Lm5LtJJi9OgribVA9bwx+2vg@HIDDEN>
X-Gnu-PR-Message: ack 11639
X-Gnu-PR-Package: emacs
Reply-To: 11639 <at> debbugs.gnu.org
Date: Wed, 06 Jun 2012 16:18:02 +0000

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

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11639: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D11639
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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
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 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...

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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