bug#21796:

Here's my reproduction of this bug. I do not get any output from xbacktrace (i did source src/.gdbinit)

In GNU Emacs 24.5.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)

of 2016-06-16 on ula034034-w1

Windowing system distributor `The X.Org Foundation', version 11.0.11501000

System Description: Ubuntu 14.04.4 LTS

Configured using:

`configure --prefix=/home/a0324034/emacs'

Important settings:

value of $LANG: en_US.UTF-8

value of $XMODIFIERS: @im=ibus

locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:

tooltip-mode: t

electric-indent-mode: t

mouse-wheel-mode: t

tool-bar-mode: t

menu-bar-mode: t

file-name-shadow-mode: t

global-font-lock-mode: t

font-lock-mode: t

blink-cursor-mode: t

auto-composition-mode: t

auto-encryption-mode: t

auto-compression-mode: t

line-number-mode: t

transient-mark-mode: t

Recent messages:

For information about GNU Emacs and the GNU system, type C-h C-a.

Quit

Making completion list...

Load-path shadows:

None found.

Features:

(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml

mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev

gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util

help-fns mail-prsvr mail-utils help-mode easymenu time-date tooltip

electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd

tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment

lisp-mode prog-mode register page menu-bar rfn-eshadow timer select

scroll-bar mouse jit-lock font-lock 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 loaddefs button faces cus-face macroexp files

text-properties overlay sha1 md5 base64 format env code-pages mule

custom widget 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)

Memory information:

((conses 16 72087 5028)

(symbols 48 17638 0)

(miscs 40 40 113)

(strings 32 9276 4364)

(string-bytes 1 258403)

(vectors 16 8987)

(vector-slots 8 383754 17180)

(floats 8 64 275)

(intervals 56 173 4)

(buffers 960 12)

(heap 1024 25044 893))

(gdb) thread apply all bt

Thread 4 (Thread 0x7fe956851700 (LWP 3454)):

#0 0x00007fe95d754fdd in poll () at ../sysdeps/unix/syscall-template.S:81

#1 0x00007fe961302fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#2 0x00007fe9613030ec in g_main_context_iteration ()

from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#3 0x00007fe961303129 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#4 0x00007fe961327f05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#5 0x00007fe95da35184 in start_thread (arg=0x7fe956851700)

at pthread_create.c:312

#6 0x00007fe95d76237d in clone ()

at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7fe955819700 (LWP 3455)):

#0 0x00007fe95d754fdd in poll () at ../sysdeps/unix/syscall-template.S:81

#1 0x00007fe961302fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#2 0x00007fe9613030ec in g_main_context_iteration ()

from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#3 0x00007fe9558211ad in ?? ()

from /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so

#4 0x00007fe961327f05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#5 0x00007fe95da35184 in start_thread (arg=0x7fe955819700)

at pthread_create.c:312

#6 0x00007fe95d76237d in clone ()

at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fe94ffff700 (LWP 3456)):

#0 0x00007fe95d754fdd in poll () at ../sysdeps/unix/syscall-template.S:81

#1 0x00007fe961302fe4 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#2 0x00007fe96130330a in g_main_loop_run ()

from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#3 0x00007fe962063336 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0

#4 0x00007fe961327f05 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#5 0x00007fe95da35184 in start_thread (arg=0x7fe94ffff700)

at pthread_create.c:312

#6 0x00007fe95d76237d in clone ()

at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fe963eaca80 (LWP 3453)):

#0 __GI___pthread_mutex_lock (mutex=0x13b8e00)

at ../nptl/pthread_mutex_lock.c:122

---Type <return> to continue, or q <return> to quit---

#1 0x00007fe961344981 in g_mutex_lock ()

from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#2 0x00007fe961302699 in g_main_context_prepare ()

from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#3 0x00007fe961302f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#4 0x00007fe961303097 in g_main_context_pending ()

from /lib/x86_64-linux-gnu/libglib-2.0.so.0

#5 0x00007fe962746e9d in gtk_events_pending ()

from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0

#6 0x00000000004ba4fb in XTread_socket (terminal=<optimized out>,

hold_quit=0x7fffcff83d70) at xterm.c:7011

#7 0x00000000004ecbe1 in gobble_input () at keyboard.c:6851

#8 0x00000000004ec605 in handle_async_input () at keyboard.c:7091

#9 process_pending_signals () at keyboard.c:7105

#10 0x000000000053dd42 in Fmake_list (length=<optimized out>, init=12144946)

at alloc.c:2637

#11 0x000000000055c7f8 in concat (nargs=nargs@entry=1,

args=args@entry=0x7fffcff83ee8, target_type=Lisp_Cons,

last_special=last_special@entry=false) at fns.c:588

#12 0x000000000055d321 in Fcopy_sequence (arg=19525990) at fns.c:456

#13 0x00000000004eb416 in timer_check () at keyboard.c:4572

#14 0x00000000004eb921 in readable_events (flags=1) at keyboard.c:3448

#15 0x00000000004ecce8 in get_input_pending (flags=1) at keyboard.c:6766

#16 0x00000000004f0134 in detect_input_pending_run_timers (

do_display=do_display@entry=true) at keyboard.c:9895

#17 0x0000000000595ac6 in wait_reading_process_output (

time_limit=time_limit@entry=30, nsecs=nsecs@entry=0,

read_kbd=read_kbd@entry=-1, do_display=do_display@entry=true,

wait_for_cell=12144946, wait_proc=wait_proc@entry=0x0,

just_wait_proc=just_wait_proc@entry=0) at process.c:4702

#18 0x0000000000421a74 in sit_for (timeout=<optimized out>,

reading=reading@entry=true, display_option=display_option@entry=1)

at dispnew.c:5867

#19 0x00000000004f0e54 in read_char (commandflag=1, map=map@entry=38081766,

prev_event=12144946, used_mouse_menu=used_mouse_menu@entry=0x7fffcff8472b,

end_time=end_time@entry=0x0) at keyboard.c:2810

#20 0x00000000004f232f in read_key_sequence (

keybuf=keybuf@entry=0x7fffcff84800, prompt=12144946,

dont_downcase_last=dont_downcase_last@entry=false,

can_return_switch_frame=can_return_switch_frame@entry=true,

fix_current_buffer=fix_current_buffer@entry=true,

---Type <return> to continue, or q <return> to quit---

prevent_redisplay=prevent_redisplay@entry=false, bufsize=30)

at keyboard.c:9089

#21 0x00000000004f3f20 in command_loop_1 () at keyboard.c:1453

#22 0x0000000000555b4e in internal_condition_case (

bfun=bfun@entry=0x4f3d30 <command_loop_1>, handlers=<optimized out>,

hfun=hfun@entry=0x4eaca0 <cmd_error>) at eval.c:1348

#23 0x00000000004e63de in command_loop_2 (ignore=ignore@entry=12144946)

at keyboard.c:1178

#24 0x0000000000555a5b in internal_catch (tag=12192450,

func=func@entry=0x4e63c0 <command_loop_2>, arg=12144946) at eval.c:1112

#25 0x00000000004ea8c7 in command_loop () at keyboard.c:1157

#26 recursive_edit_1 () at keyboard.c:778

#27 0x00000000004eabdd in Frecursive_edit () at keyboard.c:849

#28 0x0000000000417c95 in main (argc=<optimized out>, argv=0x7fffcff84b58)

at emacs.c:1642

(gdb) xbacktrace

(gdb)

From:	Mark Grosen
Subject:	bug#21796:
Date:	Mon, 11 Jul 2016 17:57:12 +0000