Segmentation fault when accessing a shared pointer in a multithreaded environment in C++17
I need help solving I've encountered a strange issue with I'm encountering a segmentation fault when accessing a `std::shared_ptr` from multiple threads. The code is using a simple producer-consumer model where the producer generates data and the consumer processes it. Here's a minimal example of what I have: ```cpp #include <iostream> #include <memory> #include <thread> #include <vector> #include <queue> #include <mutex> #include <condition_variable> class DataQueue { public: void push(std::shared_ptr<int> data) { std::lock_guard<std::mutex> lock(m_mutex); m_queue.push(data); m_cv.notify_one(); } std::shared_ptr<int> pop() { std::unique_lock<std::mutex> lock(m_mutex); m_cv.wait(lock, [&]{ return !m_queue.empty(); }); auto data = m_queue.front(); m_queue.pop(); return data; } private: std::queue<std::shared_ptr<int>> m_queue; std::mutex m_mutex; std::condition_variable m_cv; }; void producer(DataQueue &dq) { for (int i = 0; i < 10; ++i) { auto data = std::make_shared<int>(i); dq.push(data); std::this_thread::sleep_for(std::chrono::milliseconds(100)); } } void consumer(DataQueue &dq) { for (int i = 0; i < 10; ++i) { auto data = dq.pop(); std::cout << "Consumed: " << *data << '\n'; // Simulating some processing time std::this_thread::sleep_for(std::chrono::milliseconds(200)); } } int main() { DataQueue dq; std::thread prod(producer, std::ref(dq)); std::thread cons(consumer, std::ref(dq)); prod.join(); cons.join(); return 0; } ``` When I run this code, it works fine most of the time, but occasionally, I get a segmentation fault. It seems to happen when the consumer tries to access data that has already been popped from the queue. I’ve also tried using `std::atomic` to manage the shared pointer, but that didn't resolve the issue. I suspect it has something to do with the lifetime of the shared pointers in the queue or timing issues between threads. I've verified that the `DataQueue` methods are properly synchronized with mutexes. Is there a better way to manage the shared pointers or ensure they are still valid when accessed? Any insights would be appreciated! I'm coming from a different tech stack and learning C++. Any suggestions would be helpful. I'm developing on Windows 10 with C++. What would be the recommended way to handle this?