signal 6 - SIGABRT
free 多次
- char *p = malloc(100);
free(p);
free(p);
fclose 多次
- // fclose 内部调用 free
FILE *fp = fopen("test.txt", "wb+");
printf("%p\n", fp);
fclose(fp);
printf("%p\n", fp);
fclose(fp);
printf("%p\n", fp);
查看栈回溯，跟 free 多次一样，查看 glibc/libio
signal 11 - SIGSEGV
引用空指针成员
- struct Hello *p = NULL;
printf("%d\n", p->a);
fclose 空指针
- // fclose 内部引用 FILE 成员
FILE *fp = NULL;
fclose(fp);
跟引用空指针成员一致。
