Thread 1 "WebKitWebProces" received signal SIGBUS, Bus error.
0x00007f631d7cb323 in _fill_xrgb32_lerp_opaque_spans (abstract_renderer=0x7ffe4c39efa0, y=1015, h=1, spans=0x557ebfc13b70, 
    num_spans=8) at cairo-image-compositor.c:2253
2253                        *d = lerp8x4 (r->u.fill.pixel, a, *d);
(gdb) bt
#0  0x00007f631d7cb323 in _fill_xrgb32_lerp_opaque_spans (abstract_renderer=0x7ffe4c39efa0, y=1015, h=1, spans=0x557ebfc13b70, 
    num_spans=8) at cairo-image-compositor.c:2253
#1  0x00007f631d82f3b3 in blit_a8 (cells=0x557ebfc13618, renderer=0x7ffe4c39efa0, spans=0x557ebfc13b70, y=1015, height=1, xmin=3, 
    xmax=671) at cairo-tor-scan-converter.c:1643
#2  0x00007f631d82fab0 in glitter_scan_converter_render (converter=0x557ebfc12818, winding_mask=4294967295, antialias=1, 
    renderer=0x7ffe4c39efa0) at cairo-tor-scan-converter.c:1794
#3  0x00007f631d82fcb1 in _cairo_tor_scan_converter_generate (converter=0x557ebfc12800, renderer=0x7ffe4c39efa0)
    at cairo-tor-scan-converter.c:1857
#4  0x00007f631d81b7ba in composite_polygon (compositor=0x7f631dafd660 <spans>, extents=0x7ffe4c3a0890, polygon=0x7ffe4c3a0460, 
    fill_rule=CAIRO_FILL_RULE_WINDING, antialias=CAIRO_ANTIALIAS_DEFAULT) at cairo-spans-compositor.c:801
#5  0x00007f631d81be61 in clip_and_composite_polygon (compositor=0x7f631dafd660 <spans>, extents=0x7ffe4c3a0890, 
    polygon=0x7ffe4c3a0460, fill_rule=CAIRO_FILL_RULE_WINDING, antialias=CAIRO_ANTIALIAS_DEFAULT) at cairo-spans-compositor.c:967
#6  0x00007f631d81c73e in _cairo_spans_compositor_fill (_compositor=0x7f631dafd660 <spans>, extents=0x7ffe4c3a0890, 
    path=0x557ebf9d1058, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT)
    at cairo-spans-compositor.c:1174
#7  0x00007f631d7b8898 in _cairo_compositor_fill (compositor=0x7f631dafd660 <spans>, surface=0x557ebfa364a0, op=CAIRO_OPERATOR_OVER, 
    source=0x7ffe4c3a0cb0, path=0x557ebf9d1058, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, 
    antialias=CAIRO_ANTIALIAS_DEFAULT, clip=0x557ebfa36630) at cairo-compositor.c:203
#8  0x00007f631d7d27c2 in _cairo_image_surface_fill (abstract_surface=0x557ebfa364a0, op=CAIRO_OPERATOR_OVER, source=0x7ffe4c3a0cb0, 
    path=0x557ebf9d1058, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT, 
    clip=0x557ebfa36630) at cairo-image-surface.c:985
#9  0x00007f631d822231 in _cairo_surface_fill (surface=0x557ebfa364a0, op=CAIRO_OPERATOR_OVER, source=0x7ffe4c3a0cb0, 
    path=0x557ebf9d1058, fill_rule=CAIRO_FILL_RULE_WINDING, tolerance=0.10000000000000001, antialias=CAIRO_ANTIALIAS_DEFAULT, 
    clip=0x557ebfa36630) at cairo-surface.c:2341
#10 0x00007f631d7c374c in _cairo_gstate_fill (gstate=0x557ebfb74200, path=0x557ebf9d1058) at cairo-gstate.c:1317
#11 0x00007f631d7bc83b in _cairo_default_context_fill (abstract_cr=0x557ebf9d0cf0) at cairo-default-context.c:1055
#12 0x00007f631d7b080b in cairo_fill (cr=0x557ebf9d0cf0) at cairo.c:2205
#13 0x00007f631e4d432d in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#14 0x00007f631e4d2a0d in gtk_render_slider () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#15 0x00007f632082fa13 in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#16 0x00007f63201a936b in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#17 0x00007f6320116fc1 in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#18 0x00007f63201a33fe in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#19 0x00007f63201a57ed in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#20 0x00007f631f82393c in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#21 0x00007f631f909aa4 in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#22 0x00007f631f90bc82 in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
#23 0x00007f631c89d17a in ?? () from /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
#24 0x00007f631ccc804a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f631ccc83f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f631ccc8712 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f631c89d730 in WTF::RunLoop::run() () from /usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.0.so.18
#28 0x00007f631f911de9 in ?? () from /usr/lib/x86_64-linux-gnu/libwebkit2gtk-4.0.so.37
---Type <return> to continue, or q <return> to quit---
#29 0x00007f631eda2830 in __libc_start_main (main=0x557ebe14c870 <main>, argc=2, argv=0x7ffe4c3a1988, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe4c3a1978) at ../csu/libc-start.c:291
#30 0x0000557ebe14c8c9 in _start ()
(gdb) i lo
len = 0
d = 0x7f62af3ee574
a = 6 '\006'
r = 0x7ffe4c39efa0