什么是Linux中的一个核心转储文件？它提供了什么信息？ [英] What is a core dump file in Linux? What information does it provide?

问题描述

什么是在Linux核心转储文件？什么的所有信息不会提供？

What is a core dump file in linux? What all information does it provide?

推荐答案

这基本上使用的进程地址空间（从包含所有虚拟内存区的mm_struct 结构），以及任何其他支持信息 ^*一个，在坠毁的时间。

It's basically the process address space in use (from the mm_struct structure which contains all the virtual memory areas), and any other supporting information^*a, at the time it crashed.

例如，假设您尝试取消引用NULL指针，并收到一个SEGV信号，导致你退出。作为这一过程的一部分，操作系统尝试将您的信息写入供以后事后分析的文件。

For example, let's say you try to dereference a NULL pointer and receive a SEGV signal, causing you to exit. As part of that process, the operating system tries to write your information to a file for later post-mortem analysis.

您可以将核心文件加载到与可执行文件（符号和其他调试信息，例如）沿调试器和闲逛，试图发现什么问题造成的。

You can load the core file into a debugger along with the executable file (for symbols and other debugging information, for example) and poke around to try and discover what caused the problem.

^*一个：在内核版本2.6.38，的 FS / exec.c / do_coredump（） 是一个负责核心转储，你可以看到它传递的信号数量，退出code和寄存器。这反过来传递信号的数量和注册为二进制格式特定的（ELF，a.out的，等等）自卸车。

^*a: in kernel version 2.6.38, fs/exec.c/do_coredump() is the one responsible for core dumps and you can see that it's passed the signal number, exit code and registers. It in turn passes the signal number and registers to a binary-format-specific (ELF, a.out, etc) dumper.

精灵自卸车是<一个href=\"http://lxr.linux.no/#linux+v2.6.38/fs/binfmt_elf.c#L1871\"><$c$c>fs/binfmt_elf.c/elf_core_dump()你可以看到，它输出无记忆为基础的信息，如线的详细信息，在<一个href=\"http://lxr.linux.no/#linux+v2.6.38/fs/binfmt_elf.c#L1441\"><$c$c>fs/binfmt_elf.c/fill_note_info(),然后返回到输出的处理空间。

The ELF dumper is fs/binfmt_elf.c/elf_core_dump() and you can see that it outputs non-memory-based information, like thread details, in fs/binfmt_elf.c/fill_note_info(), then returns to output the process space.

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