madvise(地址、大小、MADV_DONTNEDE)会导致分段故障吗?

是 madvise(*, *, MADV_DONTNEED) 应该纯粹是咨询性的吗?我试着扫描 /proc/self/maps 并致电 madvise(addr, size, MADV_DONTNEED) 在条目上:

#include <stdio.h>
#include <sys/mman.h>

int main(void) {
    FILE *fp;
    char line[1024];

    fp = fopen("/proc/self/maps", "r");
    if (fp == NULL) {
        perror("Failed to open maps file");
        return 1;
    }

    while (fgets(line, sizeof(line), fp)) {
        char addr[32], perms[8], offset[32], dev[32], inode[32], path[256];
        unsigned long start, end;

        path[0] = '\0';
        sscanf(line, "%lx-%lx %s %s %s %s %[^\n]", &start, &end, perms, offset, dev, inode, path);

        int ret = madvise((void*)start, end - start, MADV_DONTNEED);
        if(ret == 0)
            printf("  OK\n");
        else
            printf("  Error\n");
        fflush(stdout);
    }

    fclose(fp);
}

但这打印:

  OK
  OK
  OK
  OK
Segmentation fault

有没有一个简单的方法来判断 /proc/self/maps , /proc/self/smaps 或以其他方式)允许进程调用哪些内存段 madvise(*,*,MADV_DONTNEDE) 在?