package main

import "C"

import "unsafe"

//export FuzzMe
func FuzzMe(p unsafe.Pointer, sz C.int) {
	b := C.GoBytes(p, sz)
	b = b[3:]
	if len(b) >= 4 && b[0] == 'f' && b[1] == 'u' && b[2] == 'z' && b[3] == 'z' {
		panic("found it")
	}
}

func main() {}

#include <stddef.h>

#include "f.h"

int LLVMFuzzerTestOneInput(char *data, size_t size) {
 	if (size > 0 && data[0] == 'H')
		if (size > 1 && data[1] == 'I')
			if (size > 2 && data[2] == '!')
				FuzzMe(data, size);
	return 0;
}

$ go build -buildmode=c-archive -tags=libfuzzer -gcflags=-d=libfuzzer f.go
$ clang -fsanitize=fuzzer -fuse-ld=lld f.c f.a
$ ./a.out

$ ./a.out 
INFO: Running with entropic power schedule (0xFF, 100).
INFO: Seed: 600643822
INFO: Loaded 2 modules   (28 inline 8-bit counters): 18 [0x55f97a904470, 0x55f97a904482), 10 [0x55f97a904478, 0x55f97a904482), 
INFO: Loaded 2 PC tables (18 PCs): 8 [0x55f97a904488,0x55f97a904508), 10 [0xc00005e000,0xc00005e0a0), 
ERROR: The size of coverage PC tables does not match the
number of instrumented PCs. This might be a compiler bug,
please contact the libFuzzer developers.