（注意）child pid XXXX 退出信号分段错误（11），/etc/apache2 中可能存在 coredump

我的 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

我尝试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.`

我无法理清这个问题。

我还在 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]

我不知道这是否与此问题有关，但一旦我安装了 gdb，登录时就会显示以下消息：

=> 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。

我正在我的 VPS 上运行 WordPress 网站。 VPS 是一个基于 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 之前就出现了分段错误。最后，我通过 Google PageSpeed 服务运行我的服务器，因此我安装了 Apache 2.2 的 mod_remoteip mod，并有一个 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 http://tecne.ws/11v

请协助。我们将不胜感激！

我遇到了这个问题并改变了LogLevel warn to LogLevel debug在阿帕奇配置中。重新启动时，它似乎在 mod_deflate 之后出现段错误。

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