Ah Ah! If I revert those 3 lines from build.win64x64/common/Makefile.tools then the broken VM works again!
``` ifeq ($(COMPILER_TO_USE),clang) COGDEFS:=$(COGDEFS) -mno-stack-arg-probe endif ```
So the problem comes from 920248dc54ecbcadd9121058360081665d3c7460