无coredump文件时程序segfault问题定位

1.原理：

2.涉及工具

3.错误信息获取

4.程序名称注意：

strip掉的程序名称或动态库无法查看函数表，可对应相同的文件名称分析

5.segfault格式说明：

• address  (after the  at ) - the location in memory the code is trying to access (it's likely that  10  and  11  are offsets from a pointer we expect to be set to a valid value but which is instead pointing to  0 )
• ip  - instruction pointer, ie. where the code which is trying to do this lives
• sp  - stack pointer
• error  - An error code for page faults; see below for what this means on x86.

6.程序segfault：

7.动态库：

8.举例说明：

 Use objdump

objdump -S your-program > your-program.objdump.txt

9.被strip掉之后如何定位：

10.内核代码实现：

#include <stdio.h>int g_global = 0;
int g_test = 1;extern int* g_pointer;
extern void func();int main(int argc, char *argv[])
{printf("&g_global = %p\n", &g_global);printf("&g_test = %p\n", &g_test);printf("&g_pointer = %p\n", &g_pointer);printf("g_pointer = %p\n", g_pointer);printf("&func = %p\n", &func);printf("&main = %p\n", &main);func();return 0;
}

#include <stdio.h>int* g_pointer;void func()
{*g_pointer = (int)"D.T.Software";return;
}

12.参考：

1. 没打开coredump，利用dmesg调试core的方法  没打开coredump，利用dmesg调试core的方法_tl_sunshine的博客-CSDN博客
2. http://wangpidong.blogspot.com/2015/04/how-to-figure-out-segmentation-fault.html