double free detected in tcache 2问题记录

double free detected in tcache 2问题记录

#include <iostream>
class A {
public:
    void Test() {
        std::cout << "A::Test" << std::endl;
        delete this;
    }
};

class B : public A {
public:
    void Test() {
        std::cout << "B::Test" << std::endl;
    }
};

int main() {
    A* b = new B();
    b->Test();
    free(b);
    return 0;
}

解释，当执行free(b);时会报错，因为在 b->Test();调用时已经执行了delete this;将堆区的内存释放掉，此时再次根据b的地址去释放会发现不存在，所以报错double free detected in tcache 2