I updated my maximum brush size in Krita to override the 1,000px max limit in the kritarc. When I tried to resize my brush to the larger size, Krita crashed. The program came to a halt when I changed my brush size to about 50,000 px. This crash is highly reproducible. :) (joking) We probably should set a limit when it reads that value. I am not sure what a good default would be. I did test it out at 10,000px and it seemed to work without crashing. It is a bit ridiculous with that size, but I am not sure if people will be needing much bigger than that.
That's weird, it should be limited to 10.000...
Um... It's limited to 10.000 but you can change it in the kritarc file itself. I did warn though that if you do that, I wouldn't listen to bug reports...
We're really not going to do anything about this... It's not possible.