bug#20808: 24.5; Emacs looping with 100% CPU at line 15287 (?) of xdisp.c

[N. Jackson]

I have Emacs stuck in a loop and running at 100% CPU. GDB is attached.

    (gdb) bt
    #0  0x0000000000462063 in redisplay_window (window=18301693, 
just_this_one_p=just_this_one_p@entry=true) at ../../src/xdisp.c:15286
    #1  0x0000000000463a36 in redisplay_window_1 (window=window@entry=18301693) 
at ../../src/xdisp.c:14381
    #2  0x000000000055a58b in internal_condition_case_1 (bfun=0x463a00 
<redisplay_window_1>, arg=18301693, handlers=<optimized out>, hfun=0x42bac0 
<redisplay_window_error>) at ../../src/eval.c:1372
    #3  0x0000000000453aa1 in redisplay_internal () at ../../src/xdisp.c:14024
    #4  0x0000000000454455 in redisplay () at ../../src/xdisp.c:13229
    #5  0x00000000004f44a1 in read_char (commandflag=1, map=map@entry=93744966, 
prev_event=12311602, used_mouse_menu=used_mouse_menu@entry=0x7ffc481ee12b, 
end_time=end_time@entry=0x0) at ../../src/keyboard.c:2571
    #6  0x00000000004f5c1f in read_key_sequence 
(keybuf=keybuf@entry=0x7ffc481ee200, prompt=12311602, 
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, 
prevent_redisplay=prevent_redisplay@entry=false, bufsize=30)
        at ../../src/keyboard.c:9089
    #7  0x00000000004f7990 in command_loop_1 () at ../../src/keyboard.c:1453
    #8  0x000000000055a467 in internal_condition_case (bfun=bfun@entry=0x4f7790 
<command_loop_1>, handlers=<optimized out>, hfun=hfun@entry=0x4ee950 
<cmd_error>)
        at ../../src/eval.c:1348
    #9  0x00000000004e9f6e in command_loop_2 (ignore=ignore@entry=12311602) at 
../../src/keyboard.c:1178
    #10 0x000000000055a34b in internal_catch (tag=12359074, 
func=func@entry=0x4e9f50 <command_loop_2>, arg=12311602) at 
../../src/eval.c:1112
    #11 0x00000000004ee567 in recursive_edit_1 () at ../../src/keyboard.c:1157
    #12 0x00000000004ee567 in recursive_edit_1 () at ../../src/keyboard.c:778
    #13 0x00000000004ee880 in Frecursive_edit () at ../../src/keyboard.c:849
    #14 0x0000000000418079 in main (argc=<optimized out>, argv=0x7ffc481ee568) 
at ../../src/emacs.c:1642

I can step through the code without difficulty:

    (gdb) step
    bidi_shelve_cache () at ../../src/bidi.c:846
    846       if (bidi_cache_idx == 0)

But trying to step out with `finish', leaves me looping again trying to
exit from #0:

    (gdb) finish
    Run till exit from #0  bidi_shelve_cache () at ../../src/bidi.c:846
    redisplay_window (window=18301693, 
just_this_one_p=just_this_one_p@entry=true) at ../../src/xdisp.c:15287
    15287             } while (line_bottom_y (&it1) - start_y < 
amount_to_scroll);
    Value returned is $1 = (void *) 0x0
    (gdb) finish
    Run till exit from #0  redisplay_window (window=18301693, 
just_this_one_p=just_this_one_p@entry=true) at ../../src/xdisp.c:15287
    ^C
    Program received signal SIGINT, Interrupt.
    0x0000000000462063 in redisplay_window (window=18301693, 
just_this_one_p=just_this_one_p@entry=true) at ../../src/xdisp.c:15286
    15286               SAVE_IT (it1, it, it1data);
    (gdb)

What should I do next? Can any information still be gleaned from this?
(This is not with my own build but the optimised one from Fedora 21.)

Thanks.

===

In GNU Emacs 24.5.1 (x86_64-redhat-linux-gnu, GTK+ Version 3.14.12)
 of 2015-05-07 on buildvm-08.phx2.fedoraproject.org
Windowing system distributor `Fedora Project', version 11.0.11603000
System Description:     Fedora release 21 (Twenty One)

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
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 --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 build_alias=x86_64-redhat-linux-gnu
 host_alias=x86_64-redhat-linux-gnu 'CFLAGS=-DMAIL_USE_LOCKF -O2 -g
 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
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 -grecord-gcc-switches -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ''

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image-mode dired org-bibtex bibtex org-bbdb org-w3m org-agenda org
advice help-fns org-macro org-footnote org-pcomplete pcomplete org-list
org-faces org-entities noutline outline easy-mmode org-version
ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp org-src ob-keys
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 tex-site info package edmacro kmacro recentf tree-widget
battery time saveplace wheatgrass-theme delsel paren savehist iswitchb
elec-pair desktop frameset cua-base cus-start cus-load color-theme
easymenu wid-edit cl gv cl-loaddefs cl-lib bbdb-loaddefs 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 359689 20460)
 (symbols 48 52347 0)
 (miscs 40 5232 5317)
 (strings 32 91131 7914)
 (string-bytes 1 3165959)
 (vectors 16 33087)
 (vector-slots 8 669083 3111)
 (floats 8 323 309)
 (intervals 56 1700 0)
 (buffers 960 29)
 (heap 1024 75344 1733))