But... whoever ported libnix2 + newlib to amiga needs to see a psychiatrist, because allocating a few bytes with a simple new or malloc() should not start an infinite loop that eats all available memory until it eventually paints over the screen with garbage.

How do you even let that happen?

In all of the time I have spent debugging my own porting work thinking I did something wrong, I could have used AllocMem, avoided all of this and rewritten the other handful of stdlib features I needed instead.