你怎么看段错误内核日志消息 [英] How do you read a segfault kernel log message

问题描述

这是一个非常简单的问题，我在尝试调试产生在以下段错误错误应用程序中的 kern.log

This can be a very simple question, I'm am attempting to debug an application which generates the following segfault error in the kern.log

内核：的myapp [15514]：段错误的794ef0 IP 080513b SP 794ef0错误6的myapp [8048000 + 24000]

下面是我的问题：

1. 是否有任何文件，以什么是对的段错误差异错误编号，在这种情况下它是错误6，但我看到的错误4，5

1. Is there any documentation as to what are the diff error numbers on segfault, in this instance it is error 6, but i've seen error 4, 5

什么是信息在bf794ef0 IP 0805130b SP bf794ef0和的myapp [8048000 + 24000] ？

到目前为止，我能够用符号来编译，当我做了 X 0x8048000 + 24000 它返回一个符号，就是这样做的正确方法是什么？我的假设迄今有以下几方面：

So far i was able to compile with symbols, and when i do a x 0x8048000+24000 it returns a symbol, is that the correct way of doing it? My assumptions thus far are the following:

• SP =堆栈指针？


• IP =指令指针


• 在= ????


• 的myapp [8048000 + 24000 =符号的地址？

推荐答案

根据我有限的知识，你的假设是正确的。

Based on my limited knowledge, your assumptions are correct.

• SP =堆栈指针


• IP =指令指针


• 的myapp [8048000 + 24000] =地址

• sp = stack pointer
• ip = instruction pointer
• myapp[8048000+24000] = address

如果我被调试的问题，我会修改code产生一个​​核心转储或日志一<一href=\"http://stackoverflow.com/questions/77005/how-to-generate-a-stacktrace-when-my-gcc-c-app-crashes/1925461#1925461\">stack就死机回溯。你也可以根据运行程序（或附加）GDB。

If I were debugging the problem I would modify the code to produce a core dump or log a stack backtrace on the crash. You might also run the program under (or attach) GDB.

错误code只是建筑的错误code为页面错误，似乎是体系结构相关的。他们往往在内核源代码记录在在arch / * / MM / fault.c 。我的的Linux /弓/ I386 / MM / fault.c 副本有错误_ code如下定义：

The error code is just the architectural error code for page faults and seems to be architecture specific. They are often documented in arch/*/mm/fault.c in the kernel source. My copy of Linux/arch/i386/mm/fault.c has the following definition for error_code:

• 位0 == 0表示没有找到页面，1表示保护故障


• 位1 == 0手段读出，1表示写


• 位2 == 0意味着内核，1意味着用户模式

我的的Linux /弓/ x86_64的/ MM / fault.c 的副本增加了以下内容：

My copy of Linux/arch/x86_64/mm/fault.c adds the following:

• 3位== 1表示故障已取指令

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