Problem can be solved at update_fbo() within clutter/clutter/clutter-
offscreen-effect.c
In this case at update_fbo a texture should be alocated with width 2560 which
is greater than maximal size 2048 of graphics cards.
Offscreen-effect does not support sliced textures, so this is impossible and
fails.
Crash occurs because no texture is allocated but a framebuffer is present at
priv->offscreen.
Code to free the framebuffer at priv->offscreen should be moved upwards at
update_fbo, because it also should be executed in case texture allocation fails.
This leads to the fillowing proposed code:
if (priv->texture != NULL)
{
cogl_handle_unref (priv->texture);
priv->texture = NULL;
}
if (priv->offscreen != NULL)
{
cogl_handle_unref (priv->offscreen);
priv->offscreen = NULL;
}
priv->texture =
clutter_offscreen_effect_create_texture (self, fbo_width, fbo_height);
if (priv->texture == NULL)
return FALSE;
cogl_pipeline_set_layer_texture (priv->target, 0, priv->texture);
priv->fbo_width = fbo_width;
priv->fbo_height = fbo_height;
priv->offscreen = cogl_offscreen_new_to_texture (priv->texture);
Remember bug 1790525 also should be solved (which often causes an earlier
crash), to make the solution complete.
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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1795774
Title:
gnome-shell crashed with SIGSEGV in cogl_texture_get_height() from
clutter_offscreen_effect_real_paint_target() from
clutter_offscreen_effect_paint_texture() from
clutter_offscreen_effect_paint() from clutter_actor_continue_paint()
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