求助：能否使coredump文件包含动态链接库内部的信息？

fighter10383

求助：在程序中dlopen动态打开动态链接库libapp.so，如果此so有错误，则生成的coredump文件里无法定位到具体位置，只能定位到函数符号

.o在编译的时候已经加了 -g

请问：这是否是linux 的 loader机制的限制？

      也就是说，coredump文件只能输出进程空间，对动态加载的so无法记录？

      非常感谢！

fighter10383

补充一下我的demo

********************************************

链接库:

#include <stdio.h>
#include <stdlib.h>

int fun_dll()
{
    void *pTmp = NULL;

    printf("In dll\n");

    memcpy(pTmp,0,sizeof(100));  //这行代码操作空指针，会引起coredump

    return 1;
}


*******************************************

主程序：


#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>


typedef int (*LPFun)(void);

int main()
{
    int ires = 0;

    LPFun lpFun = NULL;

    void *pHandle = dlopen("libdlldemo.so",RTLD_LAZY);

    if(NULL == pHandle)
    {
       printf("open libdlldemo failed\n");
       return 1;
    }
    else
    {
       printf("open libdlldemo succ\n");
    }

    lpFun = dlsym(pHandle,"fun_dll");
    if(NULL == lpFun)
    {
       printf("dlsym failed\n");
       return 2;
    }

    ires = lpFun();  //在这里调用动态库的函数

    dlclose(pHandle);

    return 0;
}

fighter10383

这样是会引发异常的,生成的core文件信息如下:

**************************************************

***@****:~/dllerrdemo> gdb main core
GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i586-suse-linux"...Using host libthread_db library "/lib/tls/libthread_db.so.1".

Core was generated by `./main'.
Program terminated with signal 11, Segmentation fault.

warning: current_sos: Can't read pathname for load map: 输入/输出错误

Reading symbols from /usr/lib/libcwait.so...done.
Loaded symbols for /usr/lib/libcwait.so
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /home/zxin10/lib/libdlldemo.so...done.
Loaded symbols for /home/zxin10/lib/libdlldemo.so
#0  0x400a340c in memcpy () from /lib/tls/libc.so.6
(gdb) where
#0  0x400a340c in memcpy () from /lib/tls/libc.so.6
#1  0x4001b694 in fun_dll () from /home/zxin10/lib/libdlldemo.so
#2  0x08048544 in main () at main.c:33

fighter10383

也就是说，用gdb分析这个coredump，是无法跟踪到 fun_dll函数内部的（因为它是动态打开的共享库）

能不能认为：coredump文件只能输出进程空间，对动态加载的so无法记录？

恳切的咨询：这是不是liunx的动态加载机制决定的？谢谢

编译参数：

-g3