Description of problem:
The crash happens when an external screen is connected. When the internal screen (of a Dell Latiture E6430 laptop) is the primary screen, "only" some characters and icons are rendered as white boxes; when the external screen is primary (or the only one), gnome-shell segfaults immediately. This also happens to the gnome-shell instance running in GDM, essentially preventing a login when an external monitor is connected.
This happened right after the upgrade to F28 and didn't occur with F27.
NVIDIA Corporation GF108GLM [NVS 5200M]
Version-Release number of selected component:
runlevel: N 5
Thread no. 1 (10 frames)
#0 _cogl_texture_2d_sliced_is_sliced at cogl-texture-2d-sliced.c:1300
#1 _cogl_rectangles_validate_layer_cb at cogl-primitives.c:563
#2 cogl_pipeline_foreach_layer at cogl-pipeline.c:735
#3 _cogl_framebuffer_draw_multitextured_rectangles at cogl-primitives.c:658
#4 cogl_framebuffer_draw_textured_rectangle at cogl-framebuffer.c:2456
#5 draw_texture at compositor/meta-background.c:515
#6 meta_background_get_texture at compositor/meta-background.c:850
#7 setup_pipeline at compositor/meta-background-actor.c:355
#8 meta_background_actor_paint at compositor/meta-background-actor.c:506
#9 clutter_actor_continue_paint at clutter-actor.c:4030
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