#### 5.9.1.5 使用堆栈跟踪

在某些操作系统上，错误日志包含堆栈跟踪，如果[**mysqld**](mysqld.html)意外死亡。你可以用它来找出在哪里（也许是为什么）[**mysqld**](mysqld.html)死了。看[第 5.4.2 节，“错误日志”](error-log.html).要获得堆栈跟踪，您不能编译[**mysqld**](mysqld.html)与`-fomit-frame-pointer`gcc 的选项。看[第 5.9.1.1 节，“编译 MySQL 以进行调试”](compiling-for-debugging.html).

错误日志中的堆栈跟踪如下所示：

```
mysqld got signal 11;
Attempting backtrace. You can use the following information
to find out where mysqld died. If you see no messages after
this, something went terribly wrong...

stack_bottom = 0x41fd0110 thread_stack 0x40000
mysqld(my_print_stacktrace+0x32)[0x9da402]
mysqld(handle_segfault+0x28a)[0x6648e9]
/lib/libpthread.so.0[0x7f1a5af000f0]
/lib/libc.so.6(strcmp+0x2)[0x7f1a5a10f0f2]
mysqld(_Z21check_change_passwordP3THDPKcS2_Pcj+0x7c)[0x7412cb]
mysqld(_ZN16set_var_password5checkEP3THD+0xd0)[0x688354]
mysqld(_Z17sql_set_variablesP3THDP4ListI12set_var_baseE+0x68)[0x688494]
mysqld(_Z21mysql_execute_commandP3THD+0x41a0)[0x67a170]
mysqld(_Z11mysql_parseP3THDPKcjPS2_+0x282)[0x67f0ad]
mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0xbb7[0x67fdf8]
mysqld(_Z10do_commandP3THD+0x24d)[0x6811b6]
mysqld(handle_one_connection+0x11c)[0x66e05e]
```

如果跟踪的函数名称解析失败，则跟踪包含的信息较少：

```
mysqld got signal 11;
Attempting backtrace. You can use the following information
to find out where mysqld died. If you see no messages after
this, something went terribly wrong...

stack_bottom = 0x41fd0110 thread_stack 0x40000
[0x9da402]
[0x6648e9]
[0x7f1a5af000f0]
[0x7f1a5a10f0f2]
[0x7412cb]
[0x688354]
[0x688494]
[0x67a170]
[0x67f0ad]
[0x67fdf8]
[0x6811b6]
[0x66e05e]
```

较新版本的`glibc`堆栈跟踪函数还打印相对于对象的地址。在`glibc`-based 系统 (Linux)，插件中意外退出的跟踪如下所示：

```
plugin/auth/auth_test_plugin.so(+0x9a6)[0x7ff4d11c29a6]
```

翻译相对地址（`+0x9a6`) 到文件名和行号，使用这个命令：

```
$> addr2line -fie auth_test_plugin.so 0x9a6
auth_test_plugin
mysql-trunk/plugin/auth/test_plugin.c:65
```

这**addr2line**实用程序是`二进制工具`Linux 上的软件包。

在 Solaris 上，过程类似。索拉里斯`打印堆栈（）`已经打印了相对地址：

```
plugin/auth/auth_test_plugin.so:0x1510
```

要翻译，请使用以下命令：

```
$> gaddr2line -fie auth_test_plugin.so 0x1510
mysql-trunk/plugin/auth/test_plugin.c:88
```

Windows 已经打印了地址、函数名和行：

```
000007FEF07E10A4 auth_test_plugin.dll!auth_test_plugin()[test_plugin.c:72]
```
