Date: 2024apr25 Product: MSVC, Microsoft Visual Studio Language: C/C++ Q. Visual Studio: Program crashes at line __fastfail(FAST_FAIL_STACK_COOKIE_CHECK_FAILURE); A. This is almost certainly caused by an overflow of a local variable. eg

char buf[10]; for (int i = 0; i < 100; i++) { buf[i] = 'X'; }

You can disable the check by turning off the /gs option. But, obviously, fixing he overflow is a much better approach.