GDB + coredump調試
開啟coredump:ulimit -c unlimited
ulimit -a 顯示目前使用者的各種限制。
ulimit -n 的數值表示每個程序可以打開的檔案數目。
GDB調試
在某個檔案設斷點：
break filename:linenum break filename:function http://www.delorie.com/gnu/docs/gdb/gdb_29.html 另：http://blog.csdn.net/gnuhpc/article/details/4368831
http://blog.csdn.net/yeyuangen/article/details/6825542
GDB 概述
————
GDB GNU UNIX VC BCB IDE UNIX GDB VC BCB “ ”
GDB
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2
3
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GDB GDB
一個調試示例
——————
tst.c
1 #include <stdio.h>
2
3 int func(int n)
4 {
5 int sum=0,i;
6 for(i=0; i<n; i++)
7 {
8 sum+=i;
9 }
10 return sum;
11 }
12
13
14 main()
15 {
16 int i;
17 long result = 0;
18 for(i=1; i<=100; i++)
19 {
20 result += i;
21 }
22
23 printf("result[1-100] = %d \n", result );
24 printf("result[1-250] = %d \n", func(250) );
25 }
Linux
hchen/test> cc -g tst.c -o tst
GDB
hchen/test> gdb tst <---------- GDB
GNU gdb 5.1.1
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-suse-linux"...
(gdb) l <-------------------- l list
1 #include <stdio.h>
2
3 int func(int n)
4 {
5 int sum=0,i;
6 for(i=0; i<n; i++)
7 {
8 sum+=i;
9 }
10 return sum;
(gdb) <--------------------
11 }
12
13
14 main()
15 {
16 int i;
17 long result = 0;
18 for(i=1; i<=100; i++)
19 {
20 result += i;
(gdb) break 16 <-------------------- 16
Breakpoint 1 at 0x8048496: file tst.c, line 16.
(gdb) break func <-------------------- func()
Breakpoint 2 at 0x8048456: file tst.c, line 5.
(gdb) info break <--------------------
Num Type Disp Enb Address What
1 breakpoint keep y 0x08048496 in main at tst.c:16
2 breakpoint keep y 0x08048456 in func at tst.c:5
(gdb) r <--------------------- run
Starting program: /home/hchen/test/tst
Breakpoint 1, main () at tst.c:17 <----------
17 long result = 0;
(gdb) n <--------------------- next
18 for(i=1; i<=100; i++)
(gdb) n
20 result += i;
(gdb) n
18 for(i=1; i<=100; i++)
(gdb) n
20 result += i;
(gdb) c <--------------------- continue
Continuing.
result[1-100] = 5050 <----------
Breakpoint 2, func (n=250) at tst.c:5
5 int sum=0,i;
(gdb) n
6 for(i=1; i<=n; i++)
(gdb) p i <--------------------- i print
$1 = 134513808
(gdb) n
8 sum+=i;
(gdb) n
6 for(i=1; i<=n; i++)
(gdb) p sum
$2 = 1
(gdb) n
8 sum+=i;
(gdb) p i
$3 = 2
(gdb) n
6 for(i=1; i<=n; i++)
(gdb) p sum
$4 = 3
(gdb) bt <---------------------
#0 func (n=250) at tst.c:5
#1 0x080484e4 in main () at tst.c:24
#2 0x400409ed in __libc_start_main () from /lib/libc.so.6
(gdb) finish <---------------------
Run till exit from #0 func (n=250) at tst.c:5
0x080484e4 in main () at tst.c:24
24 printf("result[1-250] = %d \n", func(250) );
Value returned is $6 = 31375
(gdb) c <---------------------
Continuing.
result[1-250] = 31375 <----------
Program exited with code 027. <--------
(gdb) q <--------------------- gdb
hchen/test>
gdb
GDB傳遞配置檔案路徑資訊
[email protected]:~/testdir$ gdb /opt/taisan/Taskgen/current/bin/search_engine_url_status_task_creator
(gdb) run -r /opt/taisan/Taskgen/current
[email protected]:~/testdir$ gdb /opt/taisan/Taskgen/current/bin/search_engine_url_status_task_creator
GNU gdb 6.8-debian
Copyright (C) 2008 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 "i486-linux-gnu"...
(gdb) run -r /opt/taisan/Taskgen/current
Starting program: /home/tracker/taisan_test/app/Taskgen/taisan_taskgen_v2.10.0.0_chenmz_test_b201204171027/bin/search_engine_url_status_task_creator -r /opt/taisan/Taskgen/current
[Thread debugging using libthread_db enabled]
[New Thread 0xb71546c0 (LWP 5113)]
[New Thread 0xb7153b90 (LWP 5116)]
[New Thread 0xb6952b90 (LWP 5117)]
[New Thread 0xb6151b90 (LWP 5118)]
[Thread 0xb6952b90 (LWP 5117) exited]
[New Thread 0xb5944b90 (LWP 5119)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb5944b90 (LWP 5119)]
0x08051795 in search_engine_url_status_task_creator_worker::wrap_run_loop (arg=0x925b608)
at search_engine_url_status_task_creator_worker.cpp:70
70search_engine_url_status_task_creator_worker.cpp: No such file or directory.
in search_engine_url_status_task_creator_worker.cpp
(gdb) [email protected]:~/testdir$ gdb /opt/taisan/Taskgen/current/bin/search_engine_url_status_task_creator
![linux-svn解除安裝與安裝[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)