http://bugzilla.opensuse.org/show_bug.cgi?id=1174816 http://bugzilla.opensuse.org/show_bug.cgi?id=1174816#c3 --- Comment #3 from Hans-Peter Jansen <hpj@urpla.net> --- Created attachment 840816 --> http://bugzilla.opensuse.org/attachment.cgi?id=840816&action=edit gdb backtrace -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1174816 http://bugzilla.opensuse.org/show_bug.cgi?id=1174816#c6 Mohamed AMAZIRH <m.amazirh@gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |m.amazirh@gmail.com --- Comment #6 from Mohamed AMAZIRH <m.amazirh@gmail.com> --- Hi Hans-Peter, I wanted to report the bug (to share my findings) but found that it was already done here. Thanks for the workaround. I investigated the issue and found that it's caused by the patch make_python_3.6_compatible.patch which is part of the files used to package blender for OpenSuse Leap 15.2. make_python_3.6_compatible.patch replaced _PyObject_LookupAttr by a combination of PyObject_HasAttr/PyObject_GetAttr to make blender's source code compatible with python 3.6. Blender crashes because, when creating a new "Video Editing" project for example, it tries to unregister the python "cycles" module but fails in bpy_rna.c#pyrna_unregister_class. (the cycles module is in /usr/share/blender/2.82/scripts/addons/cycles/) At first I thought that that, in the code introduced by the patch (in bpy_rna.c), PyObject_HasAttr returned 1 but PyObject_GetAttr returned null which was then passed to PyObject_CallObject and caused the crash. But after careful inspection, I noticed that PyObject_GetAttr exists outside of the "case 1:{...}" block, so it's never called and PyObject_CallObject always ends up with a null value as its first parameter. I attached to this ticket a modified version of make_python_3.6_compatible.patch that fixes the problem. Also, here is the chain of events leading up to the crash: 1) Blender calls bl_app_template_utils.reset() from wm_files.c (line 511) 2) then at some point unregister from __init__.py in the "cycles" module is called 3) which calls properties.unregister() on line 157 4) which then calls bpy.utils.unregister_class from properties.py on line 1622 5) which maps to pyrna_unregister_class from bpy_rna.c (apparently only the classes from the cycles module implement the register/unregister interface) I hope this is helpful for resolving the bug and thanks for your work on this package -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1174816 http://bugzilla.opensuse.org/show_bug.cgi?id=1174816#c8 Hans-Peter Jansen <hpj@urpla.net> changed: What |Removed |Added ---------------------------------------------------------------------------- Flags|needinfo?(f4tmike@web.de) | --- Comment #8 from Hans-Peter Jansen <hpj@urpla.net> --- Hey Mohamed, nice catch, and sorry, almost all installations in my environment are Tumbleweed based. Applied a refreshed version of your patch to my blender builds. If nobody confirms https://build.opensuse.org/request/show/859724 until tomorrow, I will.. It would be nice, if you could test the builds in home:frispete:blender [blender-{291,git}] regarding this issue, Mohamed. Finally, we might be able to flag this (finally) FIXED. -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1174816 http://bugzilla.opensuse.org/show_bug.cgi?id=1174816#c10 --- Comment #10 from Mohamed AMAZIRH <m.amazirh@gmail.com> --- Created attachment 844771 --> http://bugzilla.opensuse.org/attachment.cgi?id=844771&action=edit screen recording showing blender working properly using the package from home:/frispete:/blender/openSUSE_Leap_15.2/ -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1174816 http://bugzilla.opensuse.org/show_bug.cgi?id=1174816#c12 Hans-Peter Jansen <hpj@urpla.net> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|WONTFIX |FIXED --- Comment #12 from Hans-Peter Jansen <hpj@urpla.net> --- Okay, great. It's a pleasure to work with you, guys. Thanks to your persistence, eagle-eyed investigation and correct conclusions, Mohamed, we're finally able to close this ugly matter. Reminds me, that's we're all humans, and the world is a better one, if we take care on each other. Have a pleasant 2021, Pete -- You are receiving this mail because: You are on the CC list for the bug.

http://bugzilla.opensuse.org/show_bug.cgi?id=1174816 http://bugzilla.opensuse.org/show_bug.cgi?id=1174816#c14 --- Comment #14 from Mohamed AMAZIRH <m.amazirh@gmail.com> --- Glad to have been of help and thank you both. Happy new year! :) -- You are receiving this mail because: You are on the CC list for the bug.