Use UndefinedBehaviourSanitizer (UBSAN)

$ $CC -fsanitize=undefined $CFLAGS ...

$ meson compile -Db_sanitize=undefined ...

The Undefined Behaviour Sanitizer, in short UBSAN, can detect undefined behaviour like out-of-bounds errors or null pointer dereference by modifying the program at compile time during debugging. Like ASAN, it can be activated with a command-line switch.