my OS is windows 10, the problematic krita version is 4.2.6.

I don't know exactly the cause of the problem, so I will describe what I have done to potentially reproduce the bug.

My file has some big group layers (I will call them group layer A for better understanding). In each group layer A, there are 8 group layers (group layer B). In each group layer B, there are 8 clone layers where most of them also have a transform mask. Below is a picture to show the structure of the layers.
--------------------------------------- boundary ----------------------------------------------
A
|
B B B B B B B B
---------------------------------------- boundary -----------------------------------------------------
...
B
|
clone clone clone clone clone clone clone clone
(most clone have transform mask)
---------------------------------------- boundary ------------------------------------------------

To make it crash, there are several potential actions:
1. Simply toggling visibility of the group layer A can cause crash, but sometimes it doesn't. However, toggling group layer B will not crash.
2. Moving nodes across group layer A.
3. Opening such file will crash (10% chance not crashing, but for serious case, 0% chance)

I have downgraded my krita back to 4.1.7 and I could open my file successfully without any crash. I can also do nodes movement without crash.

Please try to get a crash log and create a bug on bugs.kde.org. See https://docs.krita.org/en/reference_man ... ml#dr-minw for instructions.

Sorry, where is the crash log located?

Nevermind, I found it

Okay . If at all possible, we're also going to need the original .kra file. It's also a good idea to add the krita.log file as well as the kritacrash.log file.