Segmentation fault when selecting context.area.type before applying operator (scripting) #54468

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Martin Rünz · 2018-03-30T21:48:04+02:00

Martin Rünz commented

2018-03-30 21:48:04 +02:00

System Information
OS: Ubuntu 16.04.4 LTS
HW: Dell XPS 9550 notebook, using Intel HD GPU (nvidia deactivted)

Blender Version
Broken: 2.83

Short description of error
Executing the operator bpy.ops.transform.translate causes a crash if bpy.context.area.type is set manually before.
Crash in setTransformViewMatrices because t->ar->regiondata is NULL

Exact steps for others to reproduce the error
Running the following script causes the crash:

import bpy
import bmesh

# Create object
bpy.ops.mesh.primitive_plane_add(size=1, enter_editmode=False, location=(0, 0, 0))

# Enter edit mode
bpy.context.area.type = 'VIEW_3D' # If this is not set, crash does not occur
bpy.ops.object.mode_set(mode='EDIT', toggle=False)

# Modify vertices
mesh = bmesh.from_edit_mesh(bpy.context.active_object.data)
mesh.verts.ensure_lookup_table()
mesh.verts[0].select = True

# Next call causes crash:
bpy.ops.transform.translate(value=(0, 0, 1), constraint_axis=(False, False, True),
                            mirror=False, use_proportional_edit=True,
                            proportional_edit_falloff='SHARP')

**System Information** OS: Ubuntu 16.04.4 LTS HW: Dell XPS 9550 notebook, using Intel HD GPU (nvidia deactivted) **Blender Version** Broken: 2.83 **Short description of error** Executing the operator `bpy.ops.transform.translate` causes a crash if `bpy.context.area.type` is set manually before. Crash in `setTransformViewMatrices` because `t->ar->regiondata` is `NULL` **Exact steps for others to reproduce the error** Running the following script causes the crash: ``` import bpy import bmesh # Create object bpy.ops.mesh.primitive_plane_add(size=1, enter_editmode=False, location=(0, 0, 0)) # Enter edit mode bpy.context.area.type = 'VIEW_3D' # If this is not set, crash does not occur bpy.ops.object.mode_set(mode='EDIT', toggle=False) # Modify vertices mesh = bmesh.from_edit_mesh(bpy.context.active_object.data) mesh.verts.ensure_lookup_table() mesh.verts[0].select = True # Next call causes crash: bpy.ops.transform.translate(value=(0, 0, 1), constraint_axis=(False, False, True), mirror=False, use_proportional_edit=True, proportional_edit_falloff='SHARP') ```

Martin Rünz commented

2018-03-30 21:48:04 +02:00

Added subscriber: @martin.ruenz

Philipp Oeser commented

2018-04-03 10:12:29 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2018-04-03 10:12:29 +02:00

I think what you want to do is override the context and pass that to the operator

import bpy
import bmesh

# Create object
bpy.ops.mesh.primitive_plane_add(radius=1, view_align=False, enter_editmode=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False))

# Enter edit mode
bpy.ops.object.mode_set(mode='EDIT', toggle=False)

# Modify vertices
mesh = bmesh.from_edit_mesh(bpy.context.active_object.data)
mesh.verts.ensure_lookup_table()
mesh.verts[0].select = True

# Override context
win      = bpy.context.window
scr      = win.screen
areas3d  = [area for area in scr.areas if area.type == 'VIEW_3D']
region   = [region for region in areas3d[0].regions if region.type == 'WINDOW']
override = {'window':win,
            'screen':scr,
            'area'  :areas3d[0],
            'region':region[0],
            'scene' :bpy.context.scene,
            }

# call with override context:
bpy.ops.transform.translate(override, value=(0, 0, 1), constraint_axis=(False, False, True),
                            constraint_orientation='GLOBAL', mirror=False, proportional='ENABLED',
                            proportional_edit_falloff='SHARP')

see API reference

having a look at the crash later...

I think what you want to do is override the context and pass that to the operator ``` import bpy import bmesh # Create object bpy.ops.mesh.primitive_plane_add(radius=1, view_align=False, enter_editmode=False, location=(0, 0, 0), layers=(True, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False, False)) # Enter edit mode bpy.ops.object.mode_set(mode='EDIT', toggle=False) # Modify vertices mesh = bmesh.from_edit_mesh(bpy.context.active_object.data) mesh.verts.ensure_lookup_table() mesh.verts[0].select = True # Override context win = bpy.context.window scr = win.screen areas3d = [area for area in scr.areas if area.type == 'VIEW_3D'] region = [region for region in areas3d[0].regions if region.type == 'WINDOW'] override = {'window':win, 'screen':scr, 'area' :areas3d[0], 'region':region[0], 'scene' :bpy.context.scene, } # call with override context: bpy.ops.transform.translate(override, value=(0, 0, 1), constraint_axis=(False, False, True), constraint_orientation='GLOBAL', mirror=False, proportional='ENABLED', proportional_edit_falloff='SHARP') ``` see [API reference ](https://docs.blender.org/api/blender_python_api_current/bpy.ops.html#overriding-context) having a look at the crash later...

Sebastian Parborg commented

2019-02-05 20:59:19 +01:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-02-05 20:59:19 +01:00

@lichtwerk still planning to look into this?

Campbell Barton was assigned by Sebastian Parborg

2019-03-31 21:50:22 +02:00

Sebastian Parborg commented

2019-03-31 21:50:22 +02:00

Backtrace:

Thread 1 "blender" received signal SIGSEGV, Segmentation fault.
0x00007fffeba89c17 in ?? () from /lib64/libc.so.6
(gdb) bt
- 0  0x00007fffeba89c17 in ?? () from /lib64/libc.so.6
- 1  0x00005555592b8755 in copy_m4_m4 (m1=0x7fffbc6a5a2c, m2=0x40) at /home/zed/prog/blender/source/blender/blenlib/intern/math_matrix.c:88
- 2  0x0000555558015a95 in setTransformViewMatrices (t=0x7fffbc6a5708) at /home/zed/prog/blender/source/blender/editors/transform/transform.c:235
- 3  0x00005555580762e9 in initTransInfo (C=0x7fffdc058188, t=0x7fffbc6a5708, op=0x7fffbc5dfec8, event=0x0)
    at /home/zed/prog/blender/source/blender/editors/transform/transform_generics.c:1681
#4  0x000055555801b1ac in initTransform (C=0x7fffdc058188, t=0x7fffbc6a5708, op=0x7fffbc5dfec8, event=0x0, mode=1)
    at /home/zed/prog/blender/source/blender/editors/transform/transform.c:2340
#5  0x0000555558086e01 in transformops_data (C=0x7fffdc058188, op=0x7fffbc5dfec8, event=0x0)
    at /home/zed/prog/blender/source/blender/editors/transform/transform_ops.c:370
- 6  0x0000555558087092 in transform_exec (C=0x7fffdc058188, op=0x7fffbc5dfec8) at /home/zed/prog/blender/source/blender/editors/transform/transform_ops.c:463
- 7  0x0000555557e63e48 in wm_operator_invoke (C=0x7fffdc058188, ot=0x7fffd6dfab88, event=0x0, properties=0x7fffffffcd90, reports=0x7fffb97fabb8,
    poll_only=false, use_last_properties=true) at /home/zed/prog/blender/source/blender/windowmanager/intern/wm_event_system.c:1353
#8  0x0000555557e6464b in wm_operator_call_internal (C=0x7fffdc058188, ot=0x7fffd6dfab88, properties=0x7fffffffcd90, reports=0x7fffb97fabb8, context=6,
    poll_only=false, event=0x0) at /home/zed/prog/blender/source/blender/windowmanager/intern/wm_event_system.c:1586
#9  0x0000555557e64899 in WM_operator_call_py (C=0x7fffdc058188, ot=0x7fffd6dfab88, context=6, properties=0x7fffffffcd90, reports=0x7fffb97fabb8,
    is_undo=false) at /home/zed/prog/blender/source/blender/windowmanager/intern/wm_event_system.c:1664
#10 0x00005555585af25d in pyop_call (UNUSED_self=<module at remote 0x7fffd7068688>, args=Python Exception <class 'gdb.error'> No type named PyUnicodeObject.:
)

Backtrace: ``` Thread 1 "blender" received signal SIGSEGV, Segmentation fault. 0x00007fffeba89c17 in ?? () from /lib64/libc.so.6 (gdb) bt - 0 0x00007fffeba89c17 in ?? () from /lib64/libc.so.6 - 1 0x00005555592b8755 in copy_m4_m4 (m1=0x7fffbc6a5a2c, m2=0x40) at /home/zed/prog/blender/source/blender/blenlib/intern/math_matrix.c:88 - 2 0x0000555558015a95 in setTransformViewMatrices (t=0x7fffbc6a5708) at /home/zed/prog/blender/source/blender/editors/transform/transform.c:235 - 3 0x00005555580762e9 in initTransInfo (C=0x7fffdc058188, t=0x7fffbc6a5708, op=0x7fffbc5dfec8, event=0x0) at /home/zed/prog/blender/source/blender/editors/transform/transform_generics.c:1681 #4 0x000055555801b1ac in initTransform (C=0x7fffdc058188, t=0x7fffbc6a5708, op=0x7fffbc5dfec8, event=0x0, mode=1) at /home/zed/prog/blender/source/blender/editors/transform/transform.c:2340 #5 0x0000555558086e01 in transformops_data (C=0x7fffdc058188, op=0x7fffbc5dfec8, event=0x0) at /home/zed/prog/blender/source/blender/editors/transform/transform_ops.c:370 - 6 0x0000555558087092 in transform_exec (C=0x7fffdc058188, op=0x7fffbc5dfec8) at /home/zed/prog/blender/source/blender/editors/transform/transform_ops.c:463 - 7 0x0000555557e63e48 in wm_operator_invoke (C=0x7fffdc058188, ot=0x7fffd6dfab88, event=0x0, properties=0x7fffffffcd90, reports=0x7fffb97fabb8, poll_only=false, use_last_properties=true) at /home/zed/prog/blender/source/blender/windowmanager/intern/wm_event_system.c:1353 #8 0x0000555557e6464b in wm_operator_call_internal (C=0x7fffdc058188, ot=0x7fffd6dfab88, properties=0x7fffffffcd90, reports=0x7fffb97fabb8, context=6, poll_only=false, event=0x0) at /home/zed/prog/blender/source/blender/windowmanager/intern/wm_event_system.c:1586 #9 0x0000555557e64899 in WM_operator_call_py (C=0x7fffdc058188, ot=0x7fffd6dfab88, context=6, properties=0x7fffffffcd90, reports=0x7fffb97fabb8, is_undo=false) at /home/zed/prog/blender/source/blender/windowmanager/intern/wm_event_system.c:1664 #10 0x00005555585af25d in pyop_call (UNUSED_self=<module at remote 0x7fffd7068688>, args=Python Exception <class 'gdb.error'> No type named PyUnicodeObject.: ) ```

Campbell Barton was unassigned by Dalai Felinto

2019-12-23 16:36:17 +01:00

Dalai Felinto commented

2019-12-23 16:36:17 +01:00

Added subscriber: @ideasman42

Germano Cavalcante commented

2020-01-20 23:39:35 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-01-20 23:39:35 +01:00

I can confirm, but it seems like a bad assumption that the ar->regiondata with all matrices will be immediately calculated on this line:
bpy.context.area.type = 'VIEW_3D'

Anyway, this crash does not seem to be justified.
Any operator called in python should check for these possible erros.

I can confirm, but it seems like a bad assumption that the `ar->regiondata` with all matrices will be immediately calculated on this line: ```bpy.context.area.type = 'VIEW_3D'``` Anyway, this crash does not seem to be justified. Any operator called in python should check for these possible erros.

Philipp Oeser removed the

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Segmentation fault when selecting context.area.type before applying operator (scripting) #54468