c/c++ 让进程crash很easy 搞一把野指针就可以
Java 里 让 jvm 挂掉 也可以采用类似的思路

使用  unsafe  ,名副其实，unsafe操作的确很危险

Field f = Unsafe.class.getDeclaredField("theUnsafe");
f.setAccessible(true);
unsafe = (Unsafe) f.get(null);
       
unsafe.freeMemory(1);


java(75847,0x70000021a000) malloc: *** error for object 0x1: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug