Blender crashing when working in Compositor - for example deleting Cryptomatte nodes #86271
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Reference: blender/blender#86271
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Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40
Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash:
02948a2cabWorked: (newest version of Blender that worked as expected)
Short description of error
Blender crashes when working in Compositor. I was able to reproduce it by deleting Cryptomatte nodes. Sometimes I can delete them for a certain time, but after a while (when undoing the deleting and repeating it) at some point, when I delete the Cryptomatte node, Blender crashed. It also happened that when I saved such a file and wanted to open it again, Blender immediately crashed upon opening it - even in the latest 2.93 Alpha. I'm able to open such a file in Blender 2.91 though.
Exact steps for others to reproduce the error
See above. I can basically reproduce it by repeatedly deleting Cryptomatte nodes. If it has to do with those nodes in particular - I can't tell. Sometimes those scenes, who are prone to crashing, can't be opened in 2.92 or 2.93 at all. Blender crashes during the opening process.
Here is such a file that immediately leads to crashing Blender when opening it.
Crash_01.blend
Added subscriber: @AndreasResch
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Confirmed [opening that file freezes for me], will check.
Added subscriber: @Jeroen-Bakker
I am not able to confirm the crash by opening the file. Might already be fixed by something else?
@lichtwerk can you retry?
Changed status from 'Confirmed' to: 'Needs User Info'
Have not hunted down the exact commit which solved it, but seems fine now.
@AndreasResch : this seems to be fixed, can you confirm?
I have downloaded the latest 2.92.0 and 2.93.0 Alpha. The weird thing is, that it works in 2.92.0 when I start it from the command line (Windows 10) in debug mode, but still crashes when I start it through the Start menu (no debug mode). Works in Blender 2.93.0 - even from the Start menu.
@Jeroen-Bakker: is this something we would need for a corrective release? (otherwise this could be closed I think)
I tested the issue on my second PC (also Windows 10) under the current version of 2.92.0 and it also crashes. Again started from the Start Menu.
@lichtwerk this is one for a corrective release. Think this could be related to undo that was changing the cryptomatte node.
@AndreasResch can you test with 2.92 when you disable undo?
Do you mean unchecking "Global Undo"? If so - yes, it still crashes.
Changed status from 'Needs User Info' to: 'Needs Triage'
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
@Jeroen-Bakker : is there anything more you need to know? Just add it to the list of a potential corrective release? (which I dont think is happening?)
That is fine. The fix was to not delete the matte Id after loading a file. And always update the Id
Added subscriber: @manzanilla
Changed status from 'Needs Developer To Reproduce' to: 'Resolved'
Cannot be reproduced in 2.93 or current master. I think this was fixed in
cbf033c055