Comment 2 for bug 1474393

StacktraceTop:
 __assert_fail_base (fmt=0x7fbf3d501028 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7fbf3c8a1050 "((*&(&surface->ref_count)->ref_count) > 0)", file=file@entry=0x7fbf3c8a0fe0 "../../../../src/cairo-surface.c", line=line@entry=953, function=function@entry=0x7fbf3c8a1530 <__PRETTY_FUNCTION__.11168> "cairo_surface_destroy") at assert.c:92
 __GI___assert_fail (assertion=0x7fbf3c8a1050 "((*&(&surface->ref_count)->ref_count) > 0)", file=0x7fbf3c8a0fe0 "../../../../src/cairo-surface.c", line=953, function=0x7fbf3c8a1530 <__PRETTY_FUNCTION__.11168> "cairo_surface_destroy") at assert.c:101
 INT_cairo_surface_destroy (surface=0xcdf) at ../../../../src/cairo-surface.c:953
 _get_image_surface (surface=0x1203e00, extents=0x7ffe3d289230, try_shm=18874442) at ../../../../src/cairo-xlib-surface.c:1014
 _cairo_xlib_surface_acquire_source_image (abstract_surface=0x1203e00, image_out=0x7ffe3d2892f0, image_extra=<optimized out>) at ../../../../src/cairo-xlib-surface.c:1403