Crash undoing after bpy.data.objects.remove() in editmode #65681

New Issue

kursad k · 2019-06-10T07:38:16+02:00

kursad k commented

2019-06-10 07:38:16 +02:00

{F7097143}System Information
Operating system: Windows 10
Graphics card: Intel

Blender Version
blender-2.80.0-git.030c7df19da9-windows64

Short description of error

Blender crashes when undo is called if a lattice object is deleted in edit mode via an operator addon

Exact steps for others to reproduce the error

install the addon in the attachment (copy it to addons or as zip)
open the addon tab and search for "crasher"
enable it
open the violation.blend file that is in the addon folder (or from the zip file)
it should open in lattice (active) edit mode, if not select the lattice and toggle to edit mode
F3, search for simple operator
execute it
do not do anything else, just do undo (ctrl-z)

Blender will exit with


Error   : EXCEPTION_ACCESS_VIOLATION 
Address : 0x00007FF65A3BDF97

It seems like it is possible to avoid the crash only if the user does some other stuff like selecting moving other objects after firing the addon however this does not help with the addon context, not possible to avoid this as far as I can tell.

I originally thought that using bpy.data.objects.remove(l) was causing this however using the ops equivalent bpy.ops.object.delete(use_global=False) does the same ill affect.

{[F7097143](https://archive.blender.org/developer/F7097143/simpleoperator.zip)}**System Information** Operating system: Windows 10 Graphics card: Intel **Blender Version** blender-2.80.0-git.030c7df19da9-windows64 **Short description of error** Blender crashes when undo is called if a lattice object is deleted in edit mode via an operator addon **Exact steps for others to reproduce the error** - install the addon in the attachment (copy it to addons or as zip) - open the addon tab and search for "crasher" - enable it - open the `violation.blend` file that is in the addon folder (or from the zip file) - it should open in lattice (active) edit mode, if not select the lattice and toggle to edit mode - F3, search for simple operator - execute it - do not do anything else, just do `undo` (ctrl-z) Blender will exit with ``` Error : EXCEPTION_ACCESS_VIOLATION Address : 0x00007FF65A3BDF97 ``` It seems like it is possible to avoid the crash only if the user does some other stuff like selecting moving other objects after firing the addon however this does not help with the addon context, not possible to avoid this as far as I can tell. I originally thought that using `bpy.data.objects.remove(l)` was causing this however using the ops equivalent `bpy.ops.object.delete(use_global=False)` does the same ill affect.

kursad k commented

2019-06-10 07:38:16 +02:00

Added subscriber: @kursadk

kursad k commented

2019-06-10 23:53:20 +02:00

Here is an strace of when it crashed, I got it under Winx64 10, MSYS. Probably not that useful


00007ff879060000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\number\c_utils.cp37-win_amd64.pyd at 00007ff879040000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\number\float_math.cp37-win_amd64.pyd at 00007ff879010000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\vector\vector_math.cp37-win_amd64.pyd at 00007ff878fe0000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\vector\c_utils.cp37-win_amd64.pyd at 00007ff878fc0000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\object\object_matrix_output.cp37-win_amd64.pyd at 00007ff878fa0000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\rotation\c_utils.cp37-win_amd64.pyd at 00007ff878f80000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\spline\c_utils.cp37-win_amd64.pyd at 00007ff878f60000
--- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\spline\splines_from_edges_utils.cp37-win_amd64.pyd at 00007ff878f40000
--- Process 2420 loaded C:\Windows\System32\UIAutomationCore.dll at 00007ff89ef90000
--- Process 2420 loaded C:\Windows\System32\userenv.dll at 00007ff8b6130000
--- Process 2420 thread 9888 created
--- Process 2420 thread 212 created
--- Process 2420 loaded C:\Windows\System32\sxs.dll at 00007ff8b6bf0000
--- Process 2420 thread 9568 exited with status 0x0
--- Process 2420 thread 10296 exited with status 0x0
--- Process 2420 loaded C:\Windows\System32\oleacc.dll at 00007ff8a8780000
--- Process 2420 loaded C:\Windows\System32\twinapi.dll at 00007ff89d660000
--- Process 2420, exception c0000005 at 00007ff65a3bdf97
--- Process 2420 thread 9372 exited with status 0xff
--- Process 2420 thread 11124 exited with status 0xff
--- Process 2420 thread 9888 exited with status 0xff
--- Process 2420 thread 9320 exited with status 0xff
--- Process 2420 thread 11068 exited with status 0xff
--- Process 2420 thread 1240 exited with status 0xff
--- Process 2420 thread 11256 exited with status 0xff
--- Process 2420 thread 6224 exited with status 0xff
--- Process 2420 thread 2640 exited with status 0xff
--- Process 2420 thread 5556 exited with status 0xff
--- Process 2420 thread 9772 exited with status 0xff
--- Process 2420 thread 8436 exited with status 0xff
--- Process 2420 thread 2568 exited with status 0xff
--- Process 2420 thread 5480 exited with status 0xff
--- Process 2420 thread 9500 exited with status 0xff
--- Process 2420 thread 2376 exited with status 0xff
--- Process 2420 thread 10920 exited with status 0xff
--- Process 2420 thread 5708 exited with status 0xff
--- Process 2420 thread 212 exited with status 0xff
--- Process 2420 exited with status 0xff

Here is an strace of when it crashed, I got it under Winx64 10, MSYS. Probably not that useful ``` 00007ff879060000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\number\c_utils.cp37-win_amd64.pyd at 00007ff879040000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\number\float_math.cp37-win_amd64.pyd at 00007ff879010000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\vector\vector_math.cp37-win_amd64.pyd at 00007ff878fe0000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\vector\c_utils.cp37-win_amd64.pyd at 00007ff878fc0000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\object\object_matrix_output.cp37-win_amd64.pyd at 00007ff878fa0000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\rotation\c_utils.cp37-win_amd64.pyd at 00007ff878f80000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\spline\c_utils.cp37-win_amd64.pyd at 00007ff878f60000 --- Process 2420 loaded C:\Users\USER\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\animation_nodes\nodes\spline\splines_from_edges_utils.cp37-win_amd64.pyd at 00007ff878f40000 --- Process 2420 loaded C:\Windows\System32\UIAutomationCore.dll at 00007ff89ef90000 --- Process 2420 loaded C:\Windows\System32\userenv.dll at 00007ff8b6130000 --- Process 2420 thread 9888 created --- Process 2420 thread 212 created --- Process 2420 loaded C:\Windows\System32\sxs.dll at 00007ff8b6bf0000 --- Process 2420 thread 9568 exited with status 0x0 --- Process 2420 thread 10296 exited with status 0x0 --- Process 2420 loaded C:\Windows\System32\oleacc.dll at 00007ff8a8780000 --- Process 2420 loaded C:\Windows\System32\twinapi.dll at 00007ff89d660000 --- Process 2420, exception c0000005 at 00007ff65a3bdf97 --- Process 2420 thread 9372 exited with status 0xff --- Process 2420 thread 11124 exited with status 0xff --- Process 2420 thread 9888 exited with status 0xff --- Process 2420 thread 9320 exited with status 0xff --- Process 2420 thread 11068 exited with status 0xff --- Process 2420 thread 1240 exited with status 0xff --- Process 2420 thread 11256 exited with status 0xff --- Process 2420 thread 6224 exited with status 0xff --- Process 2420 thread 2640 exited with status 0xff --- Process 2420 thread 5556 exited with status 0xff --- Process 2420 thread 9772 exited with status 0xff --- Process 2420 thread 8436 exited with status 0xff --- Process 2420 thread 2568 exited with status 0xff --- Process 2420 thread 5480 exited with status 0xff --- Process 2420 thread 9500 exited with status 0xff --- Process 2420 thread 2376 exited with status 0xff --- Process 2420 thread 10920 exited with status 0xff --- Process 2420 thread 5708 exited with status 0xff --- Process 2420 thread 212 exited with status 0xff --- Process 2420 exited with status 0xff ```

Philipp Oeser commented

2019-06-11 10:17:24 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-06-11 10:17:24 +02:00

Backtrace is a bit misleading [since this is reproducable without animation_nodes enabled], but can confirm, checking...
Deleting from the UI has a valid Lattice->editlatt in lattice_undosys_poll / editlatt_object_from_context whereas doing this from python doesnt...

Backtrace is a bit misleading [since this is reproducable without animation_nodes enabled], but can confirm, checking... Deleting from the UI has a valid `Lattice->editlatt` in `lattice_undosys_poll` / `editlatt_object_from_context` whereas doing this from python doesnt...

Philipp Oeser changed title from ~~Blender crashes with EXCEPTION_ACCESS_VIOLATION when undoing~~ to Crash undoing a removal of a lattice via python

2019-06-11 10:18:36 +02:00

kursad k commented

2019-06-11 16:20:09 +02:00

@lichtwerk

Thanks for conforming the bug. Do you know a work around with the API so I can avoid the crash until this is fixed?

@lichtwerk Thanks for conforming the bug. Do you know a work around with the API so I can avoid the crash until this is fixed?

kursad k commented

2019-06-14 20:10:37 +02:00

It seems like this bug not just affecting undo delete but also it crashes Blender after undoing lattice naming and other Lattice objct related operations

Joseph Eagar commented

2019-06-16 20:39:04 +02:00

Added subscriber: @JosephEagar

Joseph Eagar commented

2019-06-16 20:39:04 +02:00

Okay, looks like the problem is with the undo system; if you manually exit editmode then push the understack, e.g.:

bpy.ops.object.editmode_toggle()
bpy.ops.ed.undo_push()

the crash won't happen.

I imagine this could be tricky to fix; it might be a good idea to prohibit python deletion of objects in editmode.

Okay, looks like the problem is with the undo system; if you manually exit editmode then push the understack, e.g.: bpy.ops.object.editmode_toggle() bpy.ops.ed.undo_push() the crash won't happen. I imagine this could be tricky to fix; it might be a good idea to prohibit python deletion of objects in editmode.

Joseph Eagar commented

2019-06-16 20:39:40 +02:00

Added subscriber: @ideasman42

kursad k commented

2019-06-17 04:49:19 +02:00

As far as I can tell the solution recommended by @JosephEagar works in this case. I will test it further but I was able to overcome the hard crashes I have been facing when ediitng the lattice in an operator.

Campbell Barton was assigned by Philipp Oeser

2019-06-17 09:29:30 +02:00

Campbell Barton was unassigned by Dalai Felinto

2019-12-23 16:34:08 +01:00

Philipp Oeser commented

2020-02-05 15:59:34 +01:00

Reconfirmed, true for all object types that support editmode...

Philipp Oeser changed title from ~~Crash undoing a removal of a lattice via python~~ to Crash undoing after bpy.data.objects.remove() in editmode

2020-02-05 16:00:41 +01:00

Campbell Barton commented

2020-09-17 02:38:35 +02:00

Closed as duplicate of #77557

Campbell Barton closed this issue

2020-09-17 02:38:35 +02:00

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Crash undoing after bpy.data.objects.remove() in editmode #65681