1. 拿到这个程序的coredump文件。
我的在/var/log下：xxx_18.core，18是最新编号。
然后使用gdb:
$ gdb ngw ngw.18.core
GNU gdb (Ubuntu 8.1.1-0ubuntu1) 8.1.1
Copyright (C) 2018 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 ngw...done.
warning: exec file is newer than core file.
[New LWP 1]
[New LWP 2]
warning: Unexpected size of section `.reg/1' in core file.
warning: Unexpected size of section `.reg2/1' in core file.
Program terminated with signal SIGSEGV, Segmentation fault.
warning: Unexpected size of section `.reg/1' in core file.
warning: Unexpected size of section `.reg2/1' in core file.
#0 0x100bed98 in ?? ()
[Current thread is 1 (LWP 1)]
(gdb) p main
$1 = {int (void)} 0xbe30 <main()>
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