(通知)子pid XXXX退出信号分段错误(11),/ etc/apache2中可能的coredump

Question

我在Apache日志中不断收到以下错误:

[Wed Sep 18 17:59:20 2013] [notice] Apache/2.2.22 (Ubuntu) PHP/5.3.10-1ubuntu3.8 with Suhosin-Patch configured -- resuming normal operations
[Wed Sep 18 18:06:30 2013] [notice] child pid 7505 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Sep 18 18:06:35 2013] [notice] child pid 7497 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Sep 18 18:13:53 2013] [notice] child pid 7501 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Sep 18 18:13:53 2013] [notice] child pid 7506 exit signal Segmentation fault (11), possible coredump in /etc/apache2
[Wed Sep 18 18:14:14 2013] [notice] child pid 8708 exit signal Segmentation fault (11), possible coredump in /etc/apache2

我试图通过执行以下操作来回溯它:

user:~$ sudo gdb
user     8670  8571  0 18:12 pts/3    00:00:00 grep --color=auto httpd
user:~$ sudo gdb

(gdb) attach 8571
Attaching to process 8571
Reading symbols from /bin/bash...(no debugging symbols found)...done.
Reading symbols from /lib/x86_64-linux-gnu/libtinfo.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libtinfo.so.5 
Reading symbols from /lib/x86_64-linux-gnu/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libdl.so.2
Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib/x86_64-linux-gnu/libnss_compat.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libnss_compat.so.2
Reading symbols from /lib/x86_64-linux-gnu/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libnsl.so.1
Reading symbols from /lib/x86_64-linux-gnu/libnss_nis.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libnss_nis.so.2
Reading symbols from /lib/x86_64-linux-gnu/libnss_files.so.2...(no debugging symbols      found)...done.
Loaded symbols for /lib/x86_64-linux-gnu/libnss_files.so.2
0x00007f553000244e in waitpid () from /lib/x86_64-linux-gnu/libc.so.6

(gdb) backtrace
#0  0x00007f553000244e in waitpid () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x0000000000441419 in ?? ()
#2  0x000000000044255c in wait_for ()
#3  0x0000000000432c88 in execute_command_internal ()
#4  0x00000000004352fe in execute_command ()
#5  0x000000000041e31d in reader_loop ()
#6  0x000000000041ca87 in main ()

(gdb) backtrace full
#0  0x00007f553000244e in waitpid () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x0000000000441419 in ?? ()
No symbol table info available.
#2  0x000000000044255c in wait_for ()
No symbol table info available.
#3  0x0000000000432c88 in execute_command_internal ()
No symbol table info available.
#4  0x00000000004352fe in execute_command ()
No symbol table info available.
#5  0x000000000041e31d in reader_loop ()
No symbol table info available.
#6  0x000000000041ca87 in main ()
No symbol table info available.`

我无法解决问题的头脑或故事.

我也在apache上运行gdb,如下所示:

user:~$ sudo gdb apache2
Reading symbols from /usr/sbin/apache2...(no debugging symbols found)...done.

(gdb) run
Starting program: /usr/sbin/apache2
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
apache2: bad user name ${APACHE_RUN_USER}
[Inferior 1 (process 6925) exited with code 01]

我不知道它是否与此问题有关,但是一旦我安装了gdb,我登录时会显示以下消息:

=> There were exceptions while processing one or more plugins. See
 /var/log/landscape/sysinfo.log for more information.

sysinfo.log包含以下内容:

for process_info in info.get_all_process_info():
File "/usr/lib/python2.7/dist-packages/landscape/lib/process.py", line 49, in get_all_process_info
process_info = self.get_process_info(process_id)
File "/usr/lib/python2.7/dist-packages/landscape/lib/process.py", line 85, in get_process_info
process_info["state"] = STATES[state]
KeyError: 't (tracing stop)'
2013-09-18 18:43:35,633 ERROR    Processes plugin raised an exception.
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/landscape/sysinfo/sysinfo.py", line 99, in run
result = plugin.run()
File "/usr/lib/python2.7/dist-packages/landscape/sysinfo/processes.py", line 18, in run
for process_info in info.get_all_process_info():
File "/usr/lib/python2.7/dist-packages/landscape/lib/process.py", line 49, in get_all_process_info
process_info = self.get_process_info(process_id)
File "/usr/lib/python2.7/dist-packages/landscape/lib/process.py", line 85, in get_process_info
process_info["state"] = STATES[state]
KeyError: 't (tracing stop)'

一些背景.

我在我的VPS上运行一个WordPress网站.VPS是基于Ubuntu的LAMP服务器,安装了PERL和CURL.我使用APC进行缓存,但在安装APC之前发生了分段故障.最后,我通过Google PageSpeed Service运行我的服务器,所以我已经为Apache 2.2安装了mod_remoteip mod并且有一个X-Forwarded-For标头.

ulimit核心是无限的.我的phpinfo()文件可以在这里找到:http://tecne.ws/11v

请协助.非常感谢!

Answer 1

我有这个问题,并在apache配置中更改LogLevel warn为LogLevel debug.在重新启动时,它似乎是在mod_deflate之后的segfaulting.

在debian/ubuntu中关闭mod_deflate应该是 sudo a2dismod deflate

Answer 2

我间接解决了这个问题。我把 Nginx 放在 Apache 前面，不再出现分段错误。在我看来，将 Nginx 置于 Apache 之前是更好的设置。Varnish Cache 可能也解决了这个问题。