bug#21738: 25.0.50; eww freezes/crashes at times

[Kaushal Modi]

I got the below after recreating the freeze, followed by C-z in the
terminal running gdb:

(gdb) r -Q
Starting program: /home/kmodi/downloads/git/emacs/src/emacs -Q
Missing separate debuginfo for /home/kmodi/usr_local/6/lib64/libgif.so.4
Try: yum --enablerepo='*-debug*' install
/usr/lib/debug/.build-id/4d/d406f2679fcf6adf281479e95a0ae8f66c7c4e.debug
[Thread debugging using libthread_db enabled]
[New Thread 0x7fffedb6f700 (LWP 18101)]

(emacs:18093): GLib-GIO-CRITICAL **: g_settings_schema_source_lookup:
assertion 'source != NULL' failed

[New Thread 0x7fffe6574700 (LWP 18303)]
emacs: Memory allocation failed `No such file or directory' @
fatal/tiff.c/UnregisterTIFFImage/2379.
^Z
Program received signal SIGTSTP, Stopped (user).
0x0000003a9840eb9e in ?? () from /usr/lib64/libgomp.so.1
Missing separate debuginfos, use: debuginfo-install
GConf2-2.28.0-6.el6.x86_64 ORBit2-2.14.17-5.el6.x86_64
alsa-lib-1.0.22-3.el6.x86_64 atk-1.30.0-1.el6.x86_64
bzip2-libs-1.0.5-7.el6_0.x86_64 dbus-libs-1.2.24-7.el6_3.x86_64
expat-2.0.1-11.el6_2.x86_64 fftw-3.2.1-3.1.el6.x86_64
gdk-pixbuf2-2.24.1-5.el6.x86_64 glibc-2.12-1.149.el6_6.5.x86_64
gmp-4.3.1-7.el6_2.2.x86_64 gtk2-2.24.23-6.el6.x86_64
gtk2-engines-2.18.4-5.el6.x86_64 libICE-1.0.6-1.el6.x86_64
libSM-1.2.1-2.el6.x86_64 libX11-1.6.0-2.2.el6.x86_64
libXau-1.0.6-4.el6.x86_64 libXcomposite-0.4.3-4.el6.x86_64
libXcursor-1.1.14-2.1.el6.x86_64 libXdamage-1.1.3-4.el6.x86_64
libXext-1.3.2-2.1.el6.x86_64 libXfixes-5.0.1-2.1.el6.x86_64
libXft-2.3.1-2.el6.x86_64 libXi-1.7.2-2.2.el6.x86_64
libXinerama-1.1.3-2.1.el6.x86_64 libXpm-3.5.10-2.el6.x86_64
libXrandr-1.4.1-2.1.el6.x86_64 libXrender-0.9.8-2.1.el6.x86_64
libXt-1.1.4-6.1.el6.x86_64 libacl-2.2.49-6.el6.x86_64
libattr-2.4.44-7.el6.x86_64 libcroco-0.6.2-5.el6.x86_64
libgcc-4.4.7-11.el6.x86_64 libgomp-4.4.7-11.el6.x86_64
libgsf-1.14.15-5.el6.x86_64 libjpeg-turbo-1.2.1-3.el6_5.x86_64
librsvg2-2.26.0-14.el6.x86_64 libselinux-2.0.94-5.8.el6.x86_64
libtiff-3.9.4-10.el6_5.x86_64 libuuid-2.17.2-12.18.el6.x86_64
libxcb-1.9.1-2.el6.x86_64 libxml2-2.7.6-14.el6_5.2.x86_64
ncurses-libs-5.7-3.20090208.el6.x86_64 pango-1.28.1-10.el6.x86_64
sssd-client-1.11.6-30.el6.x86_64
xz-libs-4.999.9-0.5.beta.20091007git.el6.x86_64
zlib-1.2.3-29.el6.x86_64

(gdb) frame 63
#63 0x000000000063c36f in exec_byte_code (bytestr=26620996,
vector=27212957, maxdepth=34,
    args_template=0, nargs=0, args=0x0) at bytecode.c:880
880                 TOP = Ffuncall (op + 1, &TOP);

(gdb) pp error_symbol
No symbol "error_symbol" in current context.

(gdb) pp data
nil


Is that "Missing separate debuginfos" line useful? I can skip pasting in future.