2.8: Python API: crash due to missing window context in Application timer #62074

New Issue

Marc · 2019-03-01T08:49:05+01:00

Marc commented

2019-03-01 08:49:05 +01:00

System Information
Operating system: Windows 7, 64bit
Graphics card: N/A

Blender Version
Broken:
2.80, dd9cedddae, win64

Short description of error

Error : EXCEPTION_ACCESS_VIOLATION
Address : 0x000000013F495468
Module : D:\Apps\blender-2.80.0-git.dd9cedddae69-windows64\blender.exe

This is related to #62051.

Exact steps for others to reproduce the error


import bpy


def add_cylinder():
    bpy.ops.mesh.primitive_cylinder_add(
        radius=1, depth=1,
        location=(1.5, 0.0, 1),
    )
    
    obj1 = bpy.context.scene.view_layers[0].objects.active
    obj1.select_set(True)
    bpy.ops.mesh.primitive_cylinder_add(
        radius=2, depth=1,
        location=(1.5, 0.0, 1),
    )
    obj2 = bpy.context.scene.view_layers[0].objects.active
    obj2.select_set(True)
    print(bpy.ops.object.join.poll())
    window = bpy.context.window_manager.windows[0]
    
    obs = [obj1, obj2]
    ctx = {'window': window, 'screen': window.screen}  
    ctx['object'] = obs[0]
    ctx['active_object'] = obs[0]
    ctx['selected_objects'] = obs
    ctx['selected_editable_objects'] = obs
    bpy.ops.object.mode_set(ctx, mode='OBJECT')
    bpy.ops.object.join(ctx)
    
    
# add_cylinder()   # this works
bpy.app.timers.register(add_cylinder)

**System Information** Operating system: Windows 7, 64bit Graphics card: N/A **Blender Version** Broken: 2.80, dd9cedddae69, win64 **Short description of error** Error : EXCEPTION_ACCESS_VIOLATION Address : 0x000000013F495468 Module : D:\Apps\blender-2.80.0-git.dd9cedddae69-windows64\blender.exe This is related to #62051. **Exact steps for others to reproduce the error** ``` import bpy def add_cylinder(): bpy.ops.mesh.primitive_cylinder_add( radius=1, depth=1, location=(1.5, 0.0, 1), ) obj1 = bpy.context.scene.view_layers[0].objects.active obj1.select_set(True) bpy.ops.mesh.primitive_cylinder_add( radius=2, depth=1, location=(1.5, 0.0, 1), ) obj2 = bpy.context.scene.view_layers[0].objects.active obj2.select_set(True) print(bpy.ops.object.join.poll()) window = bpy.context.window_manager.windows[0] obs = [obj1, obj2] ctx = {'window': window, 'screen': window.screen} ctx['object'] = obs[0] ctx['active_object'] = obs[0] ctx['selected_objects'] = obs ctx['selected_editable_objects'] = obs bpy.ops.object.mode_set(ctx, mode='OBJECT') bpy.ops.object.join(ctx) # add_cylinder() # this works bpy.app.timers.register(add_cylinder) ```

Marc commented

2019-03-01 08:49:05 +01:00

Added subscriber: @schlamar

blender-admin commented

2019-03-01 08:49:05 +01:00

blender/blender-addons#71422 was marked as duplicate of this issue

blender-admin commented

2019-03-01 08:49:05 +01:00

blender/blender-addons#71317 was marked as duplicate of this issue

Marc changed title from ~~2.8: Python API: Access violoation calling bpy.ops.object.mode_set in Application timer~~ to 2.8: Python API: Access violation calling bpy.ops.object.mode_set in Application timer

2019-03-01 08:54:39 +01:00

Omar Emara commented

2019-03-02 16:05:40 +01:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2019-03-02 16:05:40 +01:00

System Information:
OS: Arch Linux with Xorg.

Blender Version:
Blender 2.80 (sub 45), Commit date: 2019-03-01 22:04, Hash 84820e7f58

Short description of error:
Invoking a window manager popup menu through a timer results in a segmentation fault and a crash. It seems the context window is null at this point.

Exact steps for others to reproduce the error:

A minimal working script that produces the problem:

import bpy

def in_5_seconds():
    bpy.context.window_manager.popup_menu(lambda self, context: None)

bpy.app.timers.register(in_5_seconds, first_interval=5)

Backtrace:

./blender(BLI_system_backtrace+0x1d) [0x1bb4bdd]
./blender() [0x115ad19]
/usr/lib/libc.so.6(+0x37e00) [0x7f70b7b17e00]
./blender(WM_window_pixels_x+0x4) [0x117f8f4]
./blender() [0x12fb565]
./blender(UI_block_begin+0x11d) [0x12fe34d]
./blender(UI_popup_menu_begin_ex+0x55) [0x1336b65]
./blender(WindowManager_popmenu_begin__internal_call+0x13) [0x1b317c3]
./blender(RNA_function_call+0x12) [0x1a437d2]
./blender() [0x150f74a]
./blender(_PyObject_FastCallKeywords+0x104) [0x2f8f784]
./blender(_PyEval_EvalFrameDefault+0x465c) [0x115272c]
./blender(_PyEval_EvalCodeWithName+0xae3) [0x3043973]
./blender(_PyFunction_FastCallKeywords+0xa6) [0x2f8f0e6]
./blender(_PyEval_EvalFrameDefault+0x79c3) [0x1155a93]
./blender() [0x114d020]
./blender(_PyFunction_FastCallDict+0x2a6) [0x2f8f026]
./blender() [0x15175da]
./blender(BLI_timer_execute+0x4a) [0x1b72b2a]
./blender(wm_event_do_notifiers+0x2e) [0x11655fe]
./blender(WM_main+0x28) [0x115b738]
./blender(main+0x30a) [0x10c123a]
/usr/lib/libc.so.6(__libc_start_main+0xf3) [0x7f70b7b04223]
./blender(_start+0x2a) [0x115769a]

**System Information:** OS: Arch Linux with Xorg. **Blender Version:** Blender 2.80 (sub 45), Commit date: 2019-03-01 22:04, Hash 84820e7f5806 **Short description of error:** Invoking a window manager popup menu through a timer results in a segmentation fault and a crash. It seems the context window is null at this point. **Exact steps for others to reproduce the error:** A minimal working script that produces the problem: ``` import bpy def in_5_seconds(): bpy.context.window_manager.popup_menu(lambda self, context: None) bpy.app.timers.register(in_5_seconds, first_interval=5) ``` Backtrace: ``` ./blender(BLI_system_backtrace+0x1d) [0x1bb4bdd] ./blender() [0x115ad19] /usr/lib/libc.so.6(+0x37e00) [0x7f70b7b17e00] ./blender(WM_window_pixels_x+0x4) [0x117f8f4] ./blender() [0x12fb565] ./blender(UI_block_begin+0x11d) [0x12fe34d] ./blender(UI_popup_menu_begin_ex+0x55) [0x1336b65] ./blender(WindowManager_popmenu_begin__internal_call+0x13) [0x1b317c3] ./blender(RNA_function_call+0x12) [0x1a437d2] ./blender() [0x150f74a] ./blender(_PyObject_FastCallKeywords+0x104) [0x2f8f784] ./blender(_PyEval_EvalFrameDefault+0x465c) [0x115272c] ./blender(_PyEval_EvalCodeWithName+0xae3) [0x3043973] ./blender(_PyFunction_FastCallKeywords+0xa6) [0x2f8f0e6] ./blender(_PyEval_EvalFrameDefault+0x79c3) [0x1155a93] ./blender() [0x114d020] ./blender(_PyFunction_FastCallDict+0x2a6) [0x2f8f026] ./blender() [0x15175da] ./blender(BLI_timer_execute+0x4a) [0x1b72b2a] ./blender(wm_event_do_notifiers+0x2e) [0x11655fe] ./blender(WM_main+0x28) [0x115b738] ./blender(main+0x30a) [0x10c123a] /usr/lib/libc.so.6(__libc_start_main+0xf3) [0x7f70b7b04223] ./blender(_start+0x2a) [0x115769a] ```

Jacques Lucke commented

2019-03-04 17:22:47 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2019-03-04 17:22:47 +01:00

Can reproduce the crash.
Setting the priority to low for now.

As you've guessed correctly, there is no window context when the timer executes (obviously a window is needed to open a popup in Blender).

Can you check if it is possible to open the popup from within another operator which is called in the timer?
You need to pass some extra context into the operator as shown in #62078.

Can reproduce the crash. Setting the priority to `low` for now. As you've guessed correctly, there is no window context when the timer executes (obviously a window is needed to open a popup in Blender). Can you check if it is possible to open the popup from within another operator which is called in the timer? You need to pass some extra context into the operator as shown in #62078.

Omar Emara commented

2019-03-04 18:55:06 +01:00

@JacquesLucke Yes, the following script works as expected:

import bpy

class TestOperator(bpy.types.Operator):
    bl_idname = "scene.test_operator"
    bl_label = "Test Operator"

    def execute(self, context):
        context.window_manager.popup_menu(lambda self, context: None)
        return {'FINISHED'}

bpy.utils.register_class(TestOperator)

def in_5_seconds():
    window = bpy.context.window_manager.windows[0]
    ctx = {'window': window, 'screen': window.screen}  
    bpy.ops.scene.test_operator(ctx)

bpy.app.timers.register(in_5_seconds, first_interval=5)

@JacquesLucke Yes, the following script works as expected: ``` import bpy class TestOperator(bpy.types.Operator): bl_idname = "scene.test_operator" bl_label = "Test Operator" def execute(self, context): context.window_manager.popup_menu(lambda self, context: None) return {'FINISHED'} bpy.utils.register_class(TestOperator) def in_5_seconds(): window = bpy.context.window_manager.windows[0] ctx = {'window': window, 'screen': window.screen} bpy.ops.scene.test_operator(ctx) bpy.app.timers.register(in_5_seconds, first_interval=5) ```

Jose Conseco commented

2019-04-23 16:11:45 +02:00

Added subscriber: @JoseConseco

Daniel Grauer commented

2019-06-14 20:14:04 +02:00

Added subscriber: @DanielGrauer

Jose Conseco commented

2019-06-14 21:07:26 +02:00

Since few days (around 11.june) timers will crash, if call for operator is performed inside. Simple blend file, just run script, and it will crash on line: 42

Blender Version: Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-12 18:00, hash: 2404220e80

def every_2_seconds():
    ctx = get_default_context()
    bpy.ops.object.simple_operator(ctx) #crash here
    return 2.0

Timers_operator_crash.blend

Since few days (around 11.june) timers will crash, if call for operator is performed inside. Simple blend file, just run script, and it will crash on line: 42 Blender Version: Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-12 18:00, hash: `2404220e80` ``` def every_2_seconds(): ctx = get_default_context() bpy.ops.object.simple_operator(ctx) #crash here return 2.0 ``` [Timers_operator_crash.blend](https://archive.blender.org/developer/F7103131/Timers_operator_crash.blend)

Philipp Oeser changed title from ~~2.8: Python API: Access violation calling bpy.ops.object.mode_set in Application timer~~ to 2.8: Python API: crash due to missing window context in Application timer

2019-11-05 10:39:19 +01:00

Philipp Oeser commented

2019-11-05 10:40:52 +01:00

Added subscribers: @ianh, @lichtwerk

Germano Cavalcante commented

2019-11-11 15:10:20 +01:00

Added subscribers: @simon_lusenc, @mano-wii

Casey Connor commented

2019-12-25 20:40:43 +01:00

Added subscriber: @clepsydrae

Matthias Thurau commented

2020-08-28 19:21:39 +02:00

Added subscriber: @Zweistein

Matthias Thurau commented

2020-08-28 19:21:39 +02:00

Can we set prio higher? I see new people writing issues about this quiet often and we need a fix.

Oliver Weissbarth commented

2020-09-15 11:21:48 +02:00

Added subscriber: @oweissbarth

Vilem Duha commented

2020-09-15 23:20:10 +02:00

Added subscriber: @VilemDuha

Vilem Duha commented

2020-09-15 23:20:10 +02:00

Actually, I'm getting crashes that come from calling an undo_push() operator with a context like this:

wm = bpy.data.window_managers[0]
w = wm.windows[0]
C_dict = {'window': w, 'screen': w.screen}

Not sure if this is a different issue and I should open a new report?

Actually, I'm getting crashes that come from calling an undo_push() operator with a context like this: wm = bpy.data.window_managers[0] w = wm.windows[0] C_dict = {'window': w, 'screen': w.screen} Not sure if this is a different issue and I should open a new report?

Jacques Lucke commented

2020-09-16 09:52:02 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2020-09-16 09:52:02 +02:00

Jacques Lucke self-assigned this 2020-09-16 09:52:02 +02:00

Jacques Lucke commented

2020-09-16 09:52:02 +02:00

All the testable scripts provided in this report seem to work now (also see D8531 and D8532).

@VilemDuha I recommend you try using bpy.context.copy() and then overwrite entries in the returned dict. If that does not work, you can create a new report. Please provide a simple script that we can easily test.

All the testable scripts provided in this report seem to work now (also see [D8531](https://archive.blender.org/developer/D8531) and [D8532](https://archive.blender.org/developer/D8532)). @VilemDuha I recommend you try using `bpy.context.copy()` and then overwrite entries in the returned dict. If that does not work, you can create a new report. Please provide a simple script that we can easily test.

Vilem Duha commented

2020-09-16 19:54:15 +02:00

@JacquesLucke I actually can't get it crashing with newest builds, that's great news.

Matthias Thurau commented

2020-09-16 20:32:44 +02:00

Great job guys

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

2.8: Python API: crash due to missing window context in Application timer #62074