Access violation trying to access C.evaluated_get().view_layer_eval.depsgraph
Closed, ResolvedPublicBUG
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Description

view_layer_eval_crash.blend95 KBDownload

System Information
Operating system: Win 10
Graphics card: gtx1080

Blender Version
Broken: b28 March 12, 14:38:10 - 936014ea8c74

Access violation when trying to access C.evaluated_depsgraph_get().view_layer_eval.depsgraph. Crash occurs when trying to list the members of view_layer_eval in an evaluated depsgraph. Looks like the member depsgraph is causing it. All member names not staring with d lists fine. When doing dir(C.evaluated_depsgraph_get().view_layer_eval) it tells me depsgraph is the only member starting with d in this namespace.

Exact steps for others to reproduce the error

Open interactive console and type the below. The last line should crash.

deg = C.evaluated_depsgraph_get()
deg.view_layer_eval.depsgraph

See attached redundant gif.
I even made a blend file. Just hit ctrl+space

Revisions and Commits

rB Blender
	rB055c0f907733 Fix T62504: Crash accessing depsgraph from evaluated view layer
	rB9d290c9fc62a Fix T62504: Crash accessing depsgraph from evaluated view layer
	rBca3932582626 Fix T62504: Crash accessing depsgraph from evaluated view layer

Related Objects

Mentioned In: rBb34eded93076: Cleanup: remove redundant code
T77348: Blender LTS: Maintenance Task 2.83
Mentioned Here: rB936014ea8c74: Fix missing metadata for multilayer exr sequences

Event Timeline

Kai Jægersen (kaio) created this task.Mar 12 2019, 6:32 PM

Jacques Lucke (JacquesLucke) lowered the priority of this task from 90 to 50.Mar 13 2019, 12:05 PM

Simply executing the following script in the text editor also shows the bug.

import bpy
bpy.context.depsgraph.view_layer_eval.depsgraph

Dalai Felinto (dfelinto) added a project: Tracker Curfew.Dec 23 2019, 4:34 PM

bpy.context no longer has depsgraph member

If I do steps to reproduce on evaluated_depsgraph_get() I get no crash.

Can you please check if this is still an issue in latest build?
https://builder.blender.org/download/

Yeah. Type in console:

deg = C.evaluated_depsgraph_get()

deg.view_layer_eval.depsgraph  <- crash on hitting Enter

I don't think there's anything useful in this particular location, just the crash accessing in itself was amusing back then.

Kai Jægersen (kaio) renamed this task from Access violation trying to list C.depsgraph.view_layer_eval.depsgraph to Access violation trying to access C.evaluated_get().view_layer_eval.depsgraph.Jan 28 2020, 6:05 PM

Kai Jægersen (kaio) updated the task description. (Show Details)

Ok, can confirm.

>	blender.exe!rna_ViewLayer_depsgraph_get(PointerRNA * ptr) Line 171	C
 	blender.exe!ViewLayer_depsgraph_get(PointerRNA * ptr) Line 908	C
 	blender.exe!RNA_property_pointer_get(PointerRNA * ptr, PropertyRNA * prop) Line 3757	C
 	blender.exe!pyrna_prop_to_py(PointerRNA * ptr, PropertyRNA * prop) Line 1565	C
 	blender.exe!pyrna_struct_getattro(BPy_StructRNA * self, _object * pyname) Line 4261	C
 	[Externí kód]	
 	blender.exe!bpy_class_call(bContext * C, PointerRNA * ptr, FunctionRNA * func, ParameterList * parms) Line 8333	C
 	blender.exe!rna_operator_execute_cb(bContext * C, wmOperator * op) Line 1307	C
 	blender.exe!wm_operator_invoke(bContext * C, wmOperatorType * ot, wmEvent * event, PointerRNA * properties, ReportList * reports, const bool poll_only, bool use_last_properties) Line 1269	C
 	blender.exe!wm_operator_call_internal(bContext * C, wmOperatorType * ot, PointerRNA * properties, ReportList * reports, const short context, const bool poll_only, wmEvent * event) Line 1504	C
 	blender.exe!WM_operator_name_call_ptr(bContext * C, wmOperatorType * ot, short context, PointerRNA * properties) Line 1519	C
 	blender.exe!console_indent_or_autocomplete_exec(bContext * C, wmOperator * UNUSED_op) Line 486	C
 	blender.exe!wm_operator_invoke(bContext * C, wmOperatorType * ot, wmEvent * event, PointerRNA * properties, ReportList * reports, const bool poll_only, bool use_last_properties) Line 1269	C
 	blender.exe!wm_handler_operator_call(bContext * C, ListBase * handlers, wmEventHandler * handler_base, wmEvent * event, PointerRNA * properties, const unsigned char * kmi_idname) Line 2081	C
 	blender.exe!wm_handlers_do_keymap_with_keymap_handler(bContext * C, wmEvent * event, ListBase * handlers, wmEventHandler_Keymap * handler, wmKeyMap * keymap, const bool do_debug_handler) Line 2391	C
 	blender.exe!wm_handlers_do_intern(bContext * C, wmEvent * event, ListBase * handlers) Line 2527	C
 	blender.exe!wm_handlers_do(bContext * C, wmEvent * event, ListBase * handlers) Line 2792	C
 	blender.exe!wm_event_do_handlers(bContext * C) Line 3245	C
 	blender.exe!WM_main(bContext * C) Line 421	C
 	blender.exe!main(int argc, const unsigned char * * UNUSED_argv_c) Line 520	C

id was null

Campbell Barton (campbellbarton) edited projects, added Python API; removed Add-ons (BF-Blender).Jun 19 2020, 10:35 AM

Campbell Barton (campbellbarton) moved this task from Backlog to Bugs (API) on the Python API board.Jun 19 2020, 11:00 AM

Campbell Barton (campbellbarton) moved this task from Bugs (API) to Bugs (Context) on the Python API board.Jun 19 2020, 1:36 PM

Sybren A. Stüvel (sybren) moved this task from Backlog to Bugs on the Dependency Graph board.Aug 11 2020, 4:30 PM

Campbell Barton (campbellbarton) claimed this task.Sep 12 2020, 12:23 PM

Campbell Barton (campbellbarton) closed this task as Resolved by committing rBca3932582626: Fix T62504: Crash accessing depsgraph from evaluated view layer.Sep 13 2020, 7:33 AM

Campbell Barton (campbellbarton) added a commit: rBca3932582626: Fix T62504: Crash accessing depsgraph from evaluated view layer.

Jeroen Bakker (jbakker) added a commit: rB9d290c9fc62a: Fix T62504: Crash accessing depsgraph from evaluated view layer.Sep 21 2020, 9:56 AM

Jeroen Bakker (jbakker) mentioned this in T77348: Blender LTS: Maintenance Task 2.83.Oct 7 2020, 9:04 AM

Jeroen Bakker (jbakker) added a commit: rB055c0f907733: Fix T62504: Crash accessing depsgraph from evaluated view layer.Oct 7 2020, 10:25 AM

Campbell Barton (campbellbarton) mentioned this in rBb34eded93076: Cleanup: remove redundant code.Jan 4 2021, 7:43 AM