在 GDB 中展开 goroutine 堆栈以获取 golang exe 的核心转储

Question

我需要分析用 Golang 编写的服务器的一些核心转储文件。但我无法使用 GDB 展开堆栈信息（甚至一点有用的信息）。

比如我有一个main.go，它的代码是：

package main

func main(){
    panic("stupid")
}

我使用以下方法获取核心文件：

ulimit -c unlimited
GOTRACEBACK=crash ./main

然后我运行

gdb main core

。在 gdb 中，出现如下所示的内容。

xxx@ubuntu:/tmp/crash$ gdb main core
GNU gdb (Ubuntu 7.12.50.20170314-0ubuntu1.1) 7.12.50.20170314-git
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from main...done.
[New LWP 5735]
[New LWP 5736]
[New LWP 5738]
[New LWP 5739]
[New LWP 5737]
Core was generated by `./main'.
Program terminated with signal SIGABRT, Aborted.
#0  runtime.raise () at /usr/lib/go-1.7/src/runtime/sys_linux_amd64.s:110
110        RET
[Current thread is 1 (LWP 5735)]
(gdb) source /usr/share/go-1.7/src/runtime/runtime-gdb.py
Loading Go Runtime support.
(gdb) info goroutines
* 1 running  runtime.systemstack_switch
  2 waiting  runtime.gopark
  3 waiting  runtime.gopark
(gdb) goroutine 1 bt
Python Exception <class 'gdb.error'> You can't do that without a process to debug.: 
Error occurred in Python command: You can't do that without a process to debug.
(gdb) goroutine 1 info r
Python Exception <class 'gdb.error'> You can't do that without a process to debug.: 
Error occurred in Python command: You can't do that without a process to debug.

我在这里找到了问题，但它没有给我解决方案，所以任何人都可以告诉我如何在核心转储中查看 Goroutine 信息，例如堆栈跟踪？

Answer 1

不幸的是，gdb 对 golang 的支持相当薄弱。一般来说，使用 delve 调试器会更好。

dlv core ./hello core.546
> bt
> ls

delve 调试器的命令名称是 dlv。使用 bt，您可以获得回溯并 ls 列出代码/程序集的相应部分。

有关调试器的信息可以在 https://github.com/derekparker/delve

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