double free from shared_from_this

double-free-shared-from-this.cpp

#include <memory>

class Outside;

class Inside {
public:
    Inside(std::shared_ptr<Outside> outside): outside_(outside) {}

private:
    std::shared_ptr<Outside> outside_;
};

class Outside : public std::enable_shared_from_this<Outside> {
public:
    Outside(): inside_(
        std::move(
            std::make_unique<Inside>(
                std::shared_ptr<Outside>(this)
            )
        )
    ) {}

    void init() {
        inside_ = std::make_unique<Inside>(shared_from_this());
    }

private:
    std::unique_ptr<Inside> inside_;
};

int main() {
    auto outside = std::make_shared<Outside>();
    return 0;
}