That segfault is certainly a segment fault. It is some error that is happening to some users under linux (perhaps on Ubuntu-based distros?), which produces these apparently random and unrelated crashes.
I see that another person is having the same problem with their system. It doesn’t sound like something I can solve right away, hopefully it will be an insight for those who are developing Krita. I will keep an eye on the discussion “Krita 5.0 is EXTREMELY unstable, constant crashes”. I’m not using it for business, so I’ll try Appimg or increasing the frequency of backups.
Hello. I read ”Krita 5.0 is EXTREMELY unstable, constant c rashes 5 https://krita-artists.org/t/krita-5-0-is-extremely-unstable-constant-crashes/39225” and tried two things. First, I did the following to deal with the error that occurs in the Flatpac version. I suspected that this was caused by the firmware not being up-to-date, so I updated the firmware. However, the same error occurred. Next, I tried using appimage, running it from the Terminal to see if there were any errors. So far, no sudden shutdown errors have occurred. However, other errors seem to occur from time to time. I will report back when I have a better understanding of these issues. I would like to thank all those who helped me.