segment fault because shared_ptr - majianpeng/majianpeng.github.io GitHub Wiki

#include <condition_variable> #include <thread> #include <chrono> #include <iostream> #include <sys/types.h> #include <unistd.h> #include <pthread.h> #include <set> #include <climits>

using namespace std; struct A { public: A(int i) : seq(i) { } int seq; shared_ptr<A> next = nullptr; };

int main() { int cnt = 22800; shared_ptr<A> head = nullptr, tail = nullptr;

    `while (cnt < (INT_MAX - 2000)) {`
            `head = tail = make_shared<A>(0);`
            `for (int i = 1; i < cnt; i++) {`
                    `tail->next = make_shared<A>(i);`
                    `tail = tail->next;`
            `}`
            `head = nullptr;`
            `printf("%d\n", cnt);`
            `cnt+=100;`
    `}`
    `return 0;`

}

When head=nullptr, it will call destructor of A and call destructor of A.next. If A.next is not nullptr. It will decease reference of A.next and after decrease if A.next == nullptr, it continue calldestructor of A.next. The destructor will be called until the last one. Due to too many stacks cause segment　fault .

w/ gdb:

(gdb) down #27799 0x00000000004027f5 in std::allocator_traits<std::allocator<A> >::destroy<A> (__a=..., __p=0x4fb2a0) at /usr/include/c++/11/bits/alloc_traits.h:531

总共有２７７９９　stack　frame．

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