Python API: "NodeLink" object in 'insert_link' callback of bpy.types.Node causes crash when reading some properties. #101335

New Issue

Joseph Brandenburg · 2022-09-24T18:55:07+02:00

2022-09-24 18:55:07 +02:00

System Information
Operating system: Linux-5.15.65-1-MANJARO-x86_64-with-glibc2.36 64 Bits
Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.65.01

Blender Version
Broken: version: 3.3.0, branch: master, commit date: 2022-09-06 15:39, hash: 0759f671ce
Worked: (newest version of Blender that worked as expected)

Short description of error
Trying to dereference the properties of the sockets in the link crashes Blender.

Exception thrown: read access violation.
ntree was nullptr.

>	blender.exe!nodeFindNode(bNodeTree * ntree, bNodeSocket * sock, bNode * * r_node, int * r_sockindex) Line 2038	C++

 	blender.exe!rna_NodeSocket_node_get(PointerRNA * ptr) Line 2803	C
 	blender.exe!NodeSocket_node_get(PointerRNA * ptr) Line 46896	C
 	blender.exe!RNA_property_pointer_get(PointerRNA * ptr, PropertyRNA * prop) Line 3516	C
 	blender.exe!pyrna_prop_to_py(PointerRNA * ptr, PropertyRNA * prop) Line 1429	C
 	blender.exe!pyrna_struct_getattro(BPy_StructRNA * self, _object * pyname) Line 4287	C
 	python310_d.dll!PyObject_GetAttr(_object * v, _object * name) Line 922	C
 	python310_d.dll!_PyEval_EvalFrameDefault(_ts * tstate, _frame * f, int throwflag) Line 3593	C
 	[Inline Frame] python310_d.dll!_PyEval_EvalFrame(_ts *) Line 46	C
 	python310_d.dll!_PyEval_Vector(_ts * tstate, PyFrameConstructor * con, _object * locals, _object * const * args, unsigned __int64 argcount, _object * kwnames) Line 5072	C
 	python310_d.dll!_PyFunction_Vectorcall(_object * func, _object * const * stack, unsigned __int64 nargsf, _object * kwnames) Line 342	C
 	python310_d.dll!PyVectorcall_Call(_object * callable, _object * tuple, _object * kwargs) Line 255	C
 	python310_d.dll!_PyObject_Call(_ts * tstate, _object * callable, _object * args, _object * kwargs) Line 290	C
 	python310_d.dll!PyObject_Call(_object * callable, _object * args, _object * kwargs) Line 318	C
 	blender.exe!bpy_class_call(bContext * C, PointerRNA * ptr, FunctionRNA * func, ParameterList * parms) Line 8690	C
 	blender.exe!rna_Node_insert_link(bNodeTree * ntree, bNode * node, bNodeLink * link) Line 1751	C
 	blender.exe!blender::ed::space_node::node_link_exit(bContext & C, wmOperator & op, const bool apply_links) Line 899	C++
 	blender.exe!blender::ed::space_node::node_link_modal(bContext * C, wmOperator * op, const wmEvent * event) Line 1055	C++
 	blender.exe!wm_handler_operator_call(bContext * C, ListBase * handlers, wmEventHandler * handler_base, wmEvent * event, PointerRNA * properties, const char * kmi_idname) Line 2380	C++
 	blender.exe!wm_handlers_do_intern(bContext * C, wmWindow * win, wmEvent * event, ListBase * handlers) Line 3283	C++
 	blender.exe!wm_handlers_do(bContext * C, wmEvent * event, ListBase * handlers) Line 3333	C++
 	blender.exe!wm_event_do_handlers(bContext * C) Line 3924	C++
 	blender.exe!WM_main(bContext * C) Line 643	C
 	blender.exe!main(int argc, const unsigned char * * UNUSED_argv_c) Line 579	C
 	[External Code]

Exact steps for others to reproduce the error

Open attached .blend file
run the script,
Create New Node Tree
add two nodes
connect them.
Blender will crash to desktop.
custom_nodes_simple_bug_finder.blend

**System Information** Operating system: Linux-5.15.65-1-MANJARO-x86_64-with-glibc2.36 64 Bits Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.65.01 **Blender Version** Broken: version: 3.3.0, branch: master, commit date: 2022-09-06 15:39, hash: `0759f671ce` Worked: (newest version of Blender that worked as expected) **Short description of error** Trying to dereference the properties of the sockets in the link crashes Blender. ``` Exception thrown: read access violation. ntree was nullptr. ``` ``` > blender.exe!nodeFindNode(bNodeTree * ntree, bNodeSocket * sock, bNode * * r_node, int * r_sockindex) Line 2038 C++ blender.exe!rna_NodeSocket_node_get(PointerRNA * ptr) Line 2803 C blender.exe!NodeSocket_node_get(PointerRNA * ptr) Line 46896 C blender.exe!RNA_property_pointer_get(PointerRNA * ptr, PropertyRNA * prop) Line 3516 C blender.exe!pyrna_prop_to_py(PointerRNA * ptr, PropertyRNA * prop) Line 1429 C blender.exe!pyrna_struct_getattro(BPy_StructRNA * self, _object * pyname) Line 4287 C python310_d.dll!PyObject_GetAttr(_object * v, _object * name) Line 922 C python310_d.dll!_PyEval_EvalFrameDefault(_ts * tstate, _frame * f, int throwflag) Line 3593 C [Inline Frame] python310_d.dll!_PyEval_EvalFrame(_ts *) Line 46 C python310_d.dll!_PyEval_Vector(_ts * tstate, PyFrameConstructor * con, _object * locals, _object * const * args, unsigned __int64 argcount, _object * kwnames) Line 5072 C python310_d.dll!_PyFunction_Vectorcall(_object * func, _object * const * stack, unsigned __int64 nargsf, _object * kwnames) Line 342 C python310_d.dll!PyVectorcall_Call(_object * callable, _object * tuple, _object * kwargs) Line 255 C python310_d.dll!_PyObject_Call(_ts * tstate, _object * callable, _object * args, _object * kwargs) Line 290 C python310_d.dll!PyObject_Call(_object * callable, _object * args, _object * kwargs) Line 318 C blender.exe!bpy_class_call(bContext * C, PointerRNA * ptr, FunctionRNA * func, ParameterList * parms) Line 8690 C blender.exe!rna_Node_insert_link(bNodeTree * ntree, bNode * node, bNodeLink * link) Line 1751 C blender.exe!blender::ed::space_node::node_link_exit(bContext & C, wmOperator & op, const bool apply_links) Line 899 C++ blender.exe!blender::ed::space_node::node_link_modal(bContext * C, wmOperator * op, const wmEvent * event) Line 1055 C++ blender.exe!wm_handler_operator_call(bContext * C, ListBase * handlers, wmEventHandler * handler_base, wmEvent * event, PointerRNA * properties, const char * kmi_idname) Line 2380 C++ blender.exe!wm_handlers_do_intern(bContext * C, wmWindow * win, wmEvent * event, ListBase * handlers) Line 3283 C++ blender.exe!wm_handlers_do(bContext * C, wmEvent * event, ListBase * handlers) Line 3333 C++ blender.exe!wm_event_do_handlers(bContext * C) Line 3924 C++ blender.exe!WM_main(bContext * C) Line 643 C blender.exe!main(int argc, const unsigned char * * UNUSED_argv_c) Line 579 C [External Code] ``` **Exact steps for others to reproduce the error** - Open attached .blend file - run the script, - Create `New` Node Tree - add two nodes - connect them. Blender will crash to desktop. [custom_nodes_simple_bug_finder.blend](https://archive.blender.org/developer/F13563701/custom_nodes_simple_bug_finder.blend)

Joseph Brandenburg commented

2022-09-24 18:55:07 +02:00

Added subscriber: @Josephbburg

Germano Cavalcante commented

2022-09-26 23:55:30 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-09-26 23:55:30 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2022-09-26 23:55:30 +02:00

Thanks for the report, I can confirm the problem.
It's not very clear to me what in the script causes the problem, but even if the error is in the script, the crash shouldn't be expected.
I tested it on 3.2 and saw the same issue, so it's not a regression.

Thanks for the report, I can confirm the problem. It's not very clear to me what in the script causes the problem, but even if the error is in the script, the crash shouldn't be expected. I tested it on 3.2 and saw the same issue, so it's not a regression.

Philipp Oeser removed the

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Python API: "NodeLink" object in 'insert_link' callback of bpy.types.Node causes crash when reading some properties. #101335