Created attachment 308482 [details]
keybindings

I have "Switch Windows" bound to Alt-Tab (screenshot attached)

If I'm in the middle of switching windows with Alt-Tab and one of the windows in that list closes, gnome-shell segfaults like so:

    Jul 30 10:25:36 mitchelh-linux gnome-session[2701]: **
    Jul 30 10:25:36 mitchelh-linux gnome-session[2701]: Clutter:ERROR:clutter-actor.c:1451:clutter_actor_update_map_state:  assertion failed: (!(must_be_realized && !may_be_realized))
    Jul 30 10:25:42 mitchelh-linux gnome-session[2701]: WARNING: Application 'gnome-shell.desktop' killed by signal 6
    Jul 30 10:25:43 mitchelh-linux gnome-session[2701]: gnome-session[2701]: WARNING: Application 'gnome-shell.desktop' killed by signal 6
    Jul 30 10:25:45 mitchelh-linux systemd-coredump[16284]: Process 2986 (gnome-shell) of user 202719 dumped core.

I haven't come up with an reliable way of reproducing it.  I tried opening a new gnome-terminal window and running `sleep 1; exit' and alt-tabbing before the window closes, but that doesn't seem to reproduce it for some reason...  When I do that my syslog is spammed with:

    Jul 30 11:38:49 mitchelh-linux gnome-session[2701]: (gnome-shell:16290): Clutter-WARNING **: Attempting to map a child that does not meet the necessary invariants: the actor 'MetaShapedTexture' has no parent
    Jul 30 11:38:49 mitchelh-linux gnome-session[2701]: (gnome-shell:16290): Clutter-WARNING **: Attempting to map a child that does not meet the necessary invariants: the actor 'MetaShapedTexture' has no parent
    Jul 30 11:38:49 mitchelh-linux gnome-session[2701]: (gnome-shell:16290): Clutter-WARNING **: Attempting to map a child that does not meet the necessary invariants: the actor 'MetaShapedTexture' has no parent
    (repeated 8-10 times per second as long as I leave the alt-tab switcher open)

I don't know if that's related at all or gives any clues to the more serious problem above.