Crash after #2074

[lenemter]

#0  0x00005804aa310c24 in gala_gesture_property_transition_set_to_value (self=0x5804ab895bf0, value=0x0) at ../src/Gestures/GesturePropertyTransition.vala:37
#1  0x00005804aa311740 in _vala_gala_gesture_property_transition_set_property (object=0x5804ab895bf0, property_id=5, value=0x5804ab85d790, pspec=0x5804ab85d7b0) at ../src/Gestures/GesturePropertyTransition.vala:12
#2  0x00007ea684c6b1fa in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3  0x00007ea684c6bb98 in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#4  0x00007ea684c6dbc3 in g_object_new_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#5  0x00007ea684c6df4f in g_object_new () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#6  0x00005804aa30ec2c in gala_gesture_property_transition_construct (object_type=Python Exception <class 'gdb.error'>: No type named TypeNode.

   , actor=0x5804ab7eef20, gesture_tracker=0x5804aa9d4970, property=0x5804aa37a5b8 "backdrop-opacity", from_value=0x5804ab523e50, to_value=0x7ffde8c09310, intermediate_value=0x0)
    at ../src/Gestures/GesturePropertyTransition.vala:63
#7  0x00005804aa30eca3 in gala_gesture_property_transition_new
    (actor=0x5804ab7eef20, gesture_tracker=0x5804aa9d4970, property=0x5804aa37a5b8 "backdrop-opacity", from_value=0x5804ab523e50, to_value=0x7ffde8c09310, intermediate_value=0x0) at ../src/Gestures/GesturePropertyTransition.vala:55
#8  0x00005804aa3357d2 in gala_multitasking_view_switch_workspace_with_gesture (self=0x5804aaada060, direction=META_MOTION_LEFT) at ../src/Widgets/MultitaskingView.vala:390
#9  0x00005804aa334849 in gala_multitasking_view_on_workspace_gesture_detected (self=0x5804aaada060, gesture=Python Exception <class 'ValueError'>: Variable 'static_fundamental_type_nodes' not found.
) at ../src/Widgets/MultitaskingView.vala:321
#10 0x00005804aa33a1b2 in _gala_multitasking_view_on_workspace_gesture_detected_gala_gesture_tracker_on_gesture_detected (_sender=0x5804aa9d4970, gesture=Python Exception <class 'ValueError'>: Variable 'static_fundamental_type_nodes' not found.
, self=0x5804aaada060) at ../src/Widgets/MultitaskingView.vala:78
#11 0x00005804aa313704 in g_cclosure_user_marshal_VOID__GALA_GESTURE (closure=0x5804aa9cbfa0, return_value=0x0, n_param_values=2, param_values=0x7ffde8c09670, invocation_hint=0x7ffde8c095c0, marshal_data=0x0)
    at ../src/Gestures/GestureTracker.vala:33
#12 0x00007ea684c5a2fa in g_closure_invoke () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ea684c8990c in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007ea684c7a591 in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007ea684c7a7c1 in g_signal_emit_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007ea684c7a883 in g_signal_emit () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#17 0x00005804aa312cfc in gala_gesture_tracker_gesture_detected (self=0x5804aa9d4970, gesture=Python Exception <class 'ValueError'>: Variable 'static_fundamental_type_nodes' not found.
) at ../src/Gestures/GestureTracker.vala:206
#18 0x00005804aa311fe5 in _gala_gesture_tracker_gesture_detected_gala_touchegg_backend_on_gesture_detected (_sender=0x5804aaa1b840, gesture=Python Exception <class 'ValueError'>: Variable 'static_fundamental_type_nodes' not found.
, self=0x5804aa9d4970) at ../src/Gestures/GestureTracker.vala:134
#19 0x00005804aa316bb1 in g_cclosure_user_marshal_VOID__GALA_GESTURE (closure=0x5804aa9d4b80, return_value=0x0, n_param_values=2, param_values=0x7ffde8c09c50, invocation_hint=0x7ffde8c09ba0, marshal_data=0x0)
    at ../src/Gestures/ToucheggBackend.vala:23
#20 0x00007ea684c5a2fa in g_closure_invoke () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007ea684c8990c in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007ea684c7a591 in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#23 0x00007ea684c7a7c1 in g_signal_emit_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#24 0x00007ea684c7a883 in g_signal_emit () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00005804aa316552 in ___lambda13_ (_data58_=0x7ea66001e3e0) at ../src/Gestures/ToucheggBackend.vala:205
#26 0x00005804aa3165c6 in ____lambda13__gsource_func (self=0x7ea66001e3e0) at /home/leo/Projects/gala/build/ToucheggBackend.c:726
#27 0x00007ea684d0548e in ??? () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007ea684d64717 in ??? () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007ea684d05f77 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007ea683b45341 in meta_context_run_main_loop (context=0x5804aa4f3400, error=0x7ffde8c0a180) at ../src/core/meta-context.c:554
#31 0x00005804aa2bd0e9 in gala_main (args=0x7ffde8c0a7d8, args_length1=1) at ../src/Main.vala:88
#32 0x00005804aa2bd2d4 in main (argc=1, argv=0x7ffde8c0a7d8) at ../src/Main.vala:29

[leolost2605]

Hmmm I've been running it quite a bit now and didn't have a single crash yet (both X and wayland)

The backtrace is also really strange because we construct with to_value=0x7ffde8c09310 in #7 but the setter gala_gesture_property_transition_set_to_value is called with 0x0?

Any idea what might be going on here? Or do you have some reproduction steps?

[leolost2605]

Reproduction steps:
Have two workspaces with windows.
Open multitasking view.
Move all windows from one workspace to another or close, etc. so that the current workspace is empty
Try to switch from the empty workspace via gesture.