This occurs very often!!

It's coming from automated tests where we do always use screen recording, it's happening quite randomly. We use X with automated login. 
Use cases:
1. add an account via c-c and when the account is shown press esc and then ctrl+w to close c-c

I am not quite able to reproduce locally.

We have screencasting prolonged to 600 seconds to allow recording whole test.

Is anything visible from backtrace? Is there any more info I can provide?

random stab in the dark guess:

--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -1489,4 +1489,5 @@ _clutter_stage_do_pick_on_view (ClutterStage     *stage,
-  cogl_set_viewport (priv->viewport[0] * fb_scale - viewport_offset_x,
-                     priv->viewport[1] * fb_scale - viewport_offset_y,
-                     priv->viewport[2] * fb_scale,
-                     priv->viewport[3] * fb_scale);
+  cogl_framebuffer_set_viewport (fb,
+                                 priv->viewport[0] * fb_scale - viewport_offset_x,
+                                 priv->viewport[1] * fb_scale - viewport_offset_y,
+                                 priv->viewport[2] * fb_scale,
+                                 priv->viewport[3] * fb_scale);


If i threw that in a scratch build, do you have some way to test the scratch build ?

scratch build here:
http://download.eng.bos.redhat.com/brewroot/work/tasks/9495/14499495/mutter-3.26.2-3.el7.scratch.x86_64.rpm

*** Bug 1511806 has been marked as a duplicate of this bug. ***

*** Bug 1512528 has been marked as a duplicate of this bug. ***

upstreamed here:

https://gitlab.gnome.org/GNOME/mutter/merge_requests/2

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0770