linux平台，调用函数pthread_attr_getstack，报错。

Question

不知道为什么，我在ubuntu22.04上编译c/c++代码。本不应该出现SIGSEGV错误，但是总是在调用函数pthread_attr_getstack的时候报这个错误。

//
// Created by rockjiang on 22-10-31.
//

#include "iostream"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "malloc.h"
#include <sys/mman.h>
#include "signal.h"

static unsigned int index = 0;

void sig_handler(int sig) {
    switch(sig) {
        case SIGSEGV:
            printf("GOT SIGSEGV signal %p\n", pthread_self());
            break;
        case SIGBUS:
            printf("GOT SIGBUS signal %p\n", pthread_self());
            break;
        default:
            printf("UNKNOW SIG\n");
            break;
    }
    exit(EXIT_FAILURE);
}

void *thread_function(void *arg) {
    pthread_t cur_id = pthread_self();
    pthread_attr_t attr;
    int rslt = pthread_getattr_np(cur_id, &attr);
    void* bottom;
    size_t* size;
//    if (pthread_attr_getstack(&attr, &bottom, size) != 0) {
//        perror("Cannot locate current stack attributes!");
//    }
    size_t guard_size = 0;
    rslt = pthread_attr_getguardsize(&attr, &guard_size);
    if (rslt != 0) {
        perror("pthread_attr_getguardsize failed");
    }
}

void simpleTest() {
    signal(SIGSEGV, sig_handler);
    size_t pagesize = sysconf(_SC_PAGESIZE);
    size_t guardsize = pagesize;
    size_t stacksize = pagesize;
    printf("pagesize:%d\n", pagesize);
    printf("sizeof(char*):%d\n", sizeof(char*));
    pthread_attr_t attr_t;
    pthread_t tid;
    pthread_attr_init(&attr_t);
    int ret = pthread_attr_setguardsize(&attr_t, pagesize);
    printf("ret=%d\n", ret);

    pthread_attr_setdetachstate(&attr_t, PTHREAD_CREATE_JOINABLE);

    pthread_create(&tid, &attr_t, thread_function, NULL);

    pthread_attr_getguardsize(&attr_t, &guardsize);
    pthread_attr_getstacksize(&attr_t, &stacksize);
    char* bottom;
    size_t* size;
    printf("11111\n");
    if (pthread_attr_getstack(&attr_t, (void**)bottom, size) != 0) {
        perror("Cannot locate current stack attributes!");
    }
    printf("tid=%p guardsize:%d stacksize:%d\n", pthread_self(), guardsize, stacksize);

    pthread_join(tid, NULL);



}

int main() {
    simpleTest();
}