bug#17026: 24.3.50; x-get-selection: Timed out waiting for reply from selection owner

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bug#17026: 24.3.50; x-get-selection: Timed out waiting for reply from selection owner

Tom Tromey

I'm using a recent-ish emacs trunk on x86-64 Fedora 20.
Whenever I try to paste using the middle mouse button, Emacs freezes.
After a time it comes back and gives the error:

x-get-selection: Timed out waiting for reply from selection owner




In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.6)
 of 2014-03-09 on barimba
Repository revision: 116709 [hidden email]-20140309113651-v2g63s6ewa9oxx13
Windowing system distributor `Fedora Project', version 11.0.11404000
Configured using:
 `configure --prefix=/home/tromey/Space/EmacsBzr/emacs-mt/trunk-install'

Important settings:
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: C/l

Minor modes in effect:
  global-auto-revert-mode: t
  shell-dirtrack-mode: t
  bug-reference-prog-mode: t
  diff-auto-refine-mode: t
  erc-spelling-mode: t
  erc-truncate-mode: t
  flyspell-mode: t
  erc-status-mode: t
  erc-services-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  tooltip-mode: t
  electric-indent-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
  auto-fill-function: tjt-c++-do-auto-fill
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
c - i n t <tab> <return> C-/ C-x s y y C-z n C-v C-v
C-s < < < C-a <help-echo> C-n C-k C-k C-n C-n C-n C-y
C-k C-k C-u C-p C-p C-SPC C-n C-n C-w C-n C-n C-n C-k
C-k C-n C-n C-n C-n C-n C-SPC C-n C-n C-n C-n C-w n
C-/ C-n C-n M-b M-b M-b & C-n C-n C-a C-k C-k C-p C-f
C-x C-g C-p C-k C-x s y C-z n <f10> <f10> C-x b * c
o m <tab> <return> g M-> C-z n C-u <f9> C-z n C-x b
g c c - i n t <tab> <return> M-v C-l C-z n M-f M-f
M-f M-/ M-/ M-/ M-/ M-/ <f9> C-x o g y C-x o <f9> C-x
o M-> C-x o C-x 1 C-e C-f C-f C-x s M-> C-u C-SPC C-v
C-x C-f M-p M-p M-p M-p C-g C-x b g c c - t <tab> <return>
C-x C-f g c c - s y m b o l s . c <return> C-x b <return>
M-< C-SPC C-u C-u C-n C-u C-n C-n C-n C-n C-n C-n M-w
C-x b <return> C-y M-< M-f M-f <M-backspace> s y m
b o l s M-> <backspace> # i n c l u d e SPC " s y m
t a b . h " C-a C-u C-p C-n C-k C-k M-> <return> <return>
C-x C-s C-x C-f g c c - <tab> <backspace> j <tab> -
<tab> <return> C-u C-u C-n C-l C-z n C-x b * m e s
<tab> M-b M-c <tab> <return> M-v M-v M-v M-< C-s s
e l e c t C-z n M-x r e o r <backspace> <backspace>
p o r t - e m <tab> <return> b <tab> <return>

Recent messages:
Quit
(New file)
Mark set [6 times]
syntax: ((topmost-intro 1)), indent: 0 [4 times]
Saving file /home/tromey/Space/SecondArcher/binutils-gdb/gdb/gccjit/gcc-symbols.c...
Wrote /home/tromey/Space/SecondArcher/binutils-gdb/gdb/gccjit/gcc-symbols.c
Making completion list...
Mark set
Mark saved where search started
Making completion list...

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/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-dt hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-dt
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-maint hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-maint
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/nxml-rap hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/nxml-rap
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-cmpct hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-cmpct
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-match hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-match
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/nxml-parse hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/nxml-parse
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/nxml-outln hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/nxml-outln
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-util hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-util
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-uri hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-uri
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/nxml-maint hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/nxml-maint
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/nxml-ns hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/nxml-ns
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/xsd-regexp hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/xsd-regexp
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/nxml-util hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/nxml-util
/home/tromey/.emacs.d/elpa/nxml-mode-20041004/rng-loc hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/nxml/rng-loc
/home/tromey/.emacs.d/elpa/emms-3.0/tq hides /home/tromey/Space/EmacsBzr/emacs-mt/trunk-install/share/emacs/24.3.50/lisp/emacs-lisp/tq

Features:
(shadow emacsbug novice gnus-uu yenc smerge-mode gnus-fun perl-mode
url-queue tcl pcmpl-unix pcmpl-gnu find-file cus-start cus-load
autorevert filenotify gdb-shell shell conf-mode python nxml-mode
nxml-outln nxml-rap nxml-util nxml-glyph nxml-enc xmltok find-dired grep
make-mode nnagent idutils compile mailalias cal-move bbdb-sc supercite
regi mail-hist nnir goto-addr log-edit dabbrev eieio-opt speedbar
sb-image ezimage dframe find-func help-mode autoconf autoconf-mode
sh-script smie executable shr-color color url-http url-gw url-auth eww
shr webjump w3m-cookie w3m-bookmark w3m-tabmenu w3m-session w3m doc-view
jka-compr image-mode w3m-hist w3m-fb bookmark-w3m w3m-ems w3m-ccl ccl
w3m-favicon w3m-image w3m-proc w3m-util flow-fill xterm copyright
bug-reference cc-langs cc-mode cc-fonts cc-guess cc-menus cc-cmds
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vc-svn vc-cvs vc-rcs vc-dir ewoc vc vc-dispatcher bbdb-gui bbdb-hooks
mule-util smiley gnus-cite gnus-async gnus-bcklg gnus-ml disp-table
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mail-extr bbdb-com warnings nnnil gnus-agent gnus-srvr gnus-score
score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015 epg-config mm-view
mml-smime smime dig nntp gnus-cache gnus-sum nnoo gnus-group gnus-undo
nnmail mail-source smtpmail sendmail gnus-start gnus-spec gnus-int
gnus-range message rfc822 mml mml-sec mm-decode mm-bodies mm-encode
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mailheader gnus-win gnus gnus-ems nnheader mail-utils network-stream
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emms-player-mplayer emms-setup emms-lastfm rx emms-browser sort
emms-cache emms-playlist-sort emms-score emms-player-xine
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emms-lyrics derived emms-source-file locate dired emms-player-simple
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magit-autoloads pydoc-info-autoloads info-look info weblogger-autoloads
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cal-islam cal-hebrew holidays hol-loaddefs appt diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs mouse-sel easy-mmode cl-macs gv status cl
erc-services erc-list erc-menu easymenu erc-join erc-ring erc-networks
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syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer nadvice
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hashtable-print-readable backquote make-network-process dbusbind
gfilenotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty emacs)

Tom



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bug#17026: 24.4+1-5 x-get-selection: Timed out waiting for reply from selection owner

xani666
Seems like easiest way to reproduce it is to run any command that touches primary selection, for example:

(shell-command "xclip -o -selection XA_PRIMARY")

freezes whole emacs until Ctrl+G but with XA_CLIPBOARD it works as intended

--
Mariusz Gronczewski (XANi) <[hidden email]>
GnuPG: 0xEA8ACE64
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bug#17026: 24.4+1-5 x-get-selection: Timed out waiting for reply from selection owner

Jan D.-2
Hi.

> 20 mar 2015 kl. 14:06 skrev Mariusz Gronczewski <[hidden email]>:
>
> Seems like easiest way to reproduce it is to run any command that touches primary selection, for example:
>
> (shell-command "xclip -o -selection XA_PRIMARY”)

This is not the same.  This hangs because of a deadlock.  Shell runs synchronous, and hangs until the command output has been read.  But when emacs does that, it can’t respond to the request from xclip.
It also only hangs if Emacs owns the primary selection, not if another process does.

>
> freezes whole emacs until Ctrl+G but with XA_CLIPBOARD it works as intended

It is because there is a clipboard handler running, i.e. Emacs does not answer to xclip in this case.

        Jan D.




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bug#17026: 25.0.50; struct selection_input_event data might be corrupted by assignments as another structure type

Paul Eggert
In reply to this post by Tom Tromey
Thanks for tracking down and diagnosing this bug.  I've installed a patch as
commit 1552e6737317ea2c85e06600e178114c6b0f9fb2 in emacs master; can you please
try it in your environment?

It's possible, I suppose, that this fix will affect Bug#13486 and Bug#17026
(merged with Bug#16737, Bug#17101, Bug#17172, Bug#19320, Bug#20283).  Ideally
those bugs would go away too, though this is a shot in the dark.  Anyway, I'll
CC: to those bug reports to give their followers a heads-up.



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bug#17026: 25.0.50; struct selection_input_event data might be corrupted by assignments as another structure type

YAMAMOTO Mitsuharu
>>>>> On Tue, 23 Jun 2015 16:44:26 -0700, Paul Eggert <[hidden email]> said:

> Thanks for tracking down and diagnosing this bug.  I've installed a
> patch as commit 1552e6737317ea2c85e06600e178114c6b0f9fb2 in emacs
> master; can you please try it in your environment?

Thanks for looking into this.  But it doesn't build as it is in the
original environment: OS X 10.7, and the following version of llvm-gcc

  i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)

The error message is:

gcc -std=gnu99 -c -I/opt/local/include -Demacs  -I. -I../../../emacs/trunk/src -I../lib -I../../../emacs/trunk/lib   -D_REENTRANT -I/opt/local/include/gtk-3.0 -I/opt/local/include/at-spi2-atk/2.0 -I/opt/local/include/at-spi-2.0 -I/opt/local/include/dbus-1.0 -I/opt/local/lib/dbus-1.0/include -I/opt/local/include/gtk-3.0 -I/opt/local/include/gio-unix-2.0/ -I/opt/local/include -I/opt/local/include/cairo -I/opt/local/include -I/opt/local/include/pango-1.0 -I/opt/local/include/harfbuzz -I/opt/local/include/pango-1.0 -I/opt/local/include/atk-1.0 -I/opt/local/include/cairo -I/opt/local/include/pixman-1 -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/libpng16 -I/opt/local/include -I/opt/local/include/gdk-pixbuf-2.0 -I/opt/local/include/libpng16 -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include  -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/libpng16 -I/opt/local/include    -D_REENTRANT -I/opt/local/include/librsvg-2.0 -I/opt/local/include/gdk-pixbuf-2.0 -I/opt/local/include/libpng16 -I/opt/local/include/cairo -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include -I/opt/local/include/pixman-1 -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/libpng16 -I/opt/local/include  -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16 -DMAGICKCORE_HDRI_ENABLE=0 -DMAGICKCORE_QUANTUM_DEPTH=16 -I/opt/local/include/ImageMagick-6  -I/opt/local/include/libpng16 -I/opt/local/include/libxml2  -I/opt/local/include/dbus-1.0 -I/opt/local/lib/dbus-1.0/include  -I/opt/local/include  -I/opt/local/include  -I/opt/local/include  -D_REENTRANT -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include  -DORBIT2=1 -D_REENTRANT -I/opt/local/include/gconf/2 -I/opt/local/include/orbit-2.0 -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include  -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include  -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/libpng16  -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/freetype2 -I/opt/local/include -I/opt/local/include/libpng16    -MMD -MF deps/dispnew.d -MP -I/opt/local/include -I/opt/local/include/p11-kit-1 -I/opt/local/include  -D_REENTRANT -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include     -g3 -O2  ../../../emacs/trunk/src/dispnew.c
In file included from ../../../emacs/trunk/src/dispnew.c:33:
../../../emacs/trunk/src/keyboard.h: In function ‘kbd_buffer_store_event_hold’:
../../../emacs/trunk/src/keyboard.h:461: error: expected specifier-qualifier-list before ‘*’ token
../../../emacs/trunk/src/keyboard.h:461: error: ‘struct <anonymous>’ has no member named ‘__b’
../../../emacs/trunk/src/keyboard.h:461: error: expected specifier-qualifier-list before ‘*’ token
../../../emacs/trunk/src/keyboard.h:461: error: ‘struct <anonymous>’ has no member named ‘__b’
../../../emacs/trunk/src/keyboard.h:461: error: bit-field ‘_gl_verify_error_if_negative’ width not an integer constant
make: *** [dispnew.o] Error 1


The output of gcc -E for the corresponding part is:

kbd_buffer_store_event_hold (struct input_event *event,
        struct input_event *hold_quit)
{
  union buffered_input_event *ev = (union buffered_input_event *) event;
  extern int (*_gl_verify_function461 (void)) [(!!sizeof (struct { unsigned int _gl_verify_error_if_negative: (sizeof *event == sizeof *ev && __builtin_offsetof (struct { char __a; *event __b; }, __b) == __builtin_offsetof (struct { char __a; *ev __b; }, __b)) ? 1 : -1; }))];
  return kbd_buffer_store_buffered_event ((union buffered_input_event *) event,
       hold_quit);
}


If I comment out the line for the "verify" macro, the it successfully
builds and runs without crash.

                                     YAMAMOTO Mitsuharu
                                [hidden email]



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bug#17026: 25.0.50; struct selection_input_event data might be corrupted by assignments as another structure type

Paul Eggert
YAMAMOTO Mitsuharu wrote:
> ../../../emacs/trunk/src/keyboard.h:461: error: expected specifier-qualifier-list before ‘*’ token

Thanks, it appears I was assuming C11 semantics that clang doesn't support.  I
installed the attached further patch, which worked for me with clang
3.6.0-2ubuntu1 (Ubuntu 15.04).

0001-Port-selection-info-fix-to-clang.patch (1K) Download Attachment
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bug#17026: 25.0.50; struct selection_input_event data might be corrupted by assignments as another structure type

YAMAMOTO Mitsuharu
>>>>> On Tue, 23 Jun 2015 18:05:27 -0700, Paul Eggert <[hidden email]> said:

> YAMAMOTO Mitsuharu wrote:
>> ../../../emacs/trunk/src/keyboard.h:461: error: expected specifier-qualifier-list before ‘*’ token

> Thanks, it appears I was assuming C11 semantics that clang doesn't support.  I
> installed the attached further patch, which worked for me with clang
> 3.6.0-2ubuntu1 (Ubuntu 15.04).

It now builds and works for me, too.  Thanks again.

                                     YAMAMOTO Mitsuharu
                                [hidden email]



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bug#13486: 25.0.50; struct selection_input_event data might be corrupted by assignments as another structure type

Lars Ingebrigtsen
In reply to this post by Paul Eggert
Paul Eggert <[hidden email]> writes:

> Thanks for tracking down and diagnosing this bug.  I've installed a
> patch as commit 1552e6737317ea2c85e06600e178114c6b0f9fb2 in emacs
> master; can you please try it in your environment?
>
> It's possible, I suppose, that this fix will affect Bug#13486 and
> Bug#17026 (merged with Bug#16737, Bug#17101, Bug#17172, Bug#19320,
> Bug#20283).  Ideally those bugs would go away too, though this is a
> shot in the dark.  Anyway, I'll CC: to those bug reports to give their
> followers a heads-up.

This was five years ago, and I tried reproducing the test case in
#13486, and I was unable to see any slowness here, so I'm closing this
bug report.  If anybody is still seeing this, please respond to the
debbugs address, and we'll reopen.

--
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no