Segmentation fault on M1 with Big Sur and 4K display

[anthlover]

There are sister threads here and support documents for removing a corrupt install. I would start with looking them over.... You can prevent most issues temporarily by Starting up computer after shut down with Shift key held down which will put you in Safe boot, you have to hold it for a long time and you will eventually see safe boot, in red in top right hand corner of login screen.