php - apache error.log 中的 "[notice] child pid XXXX exit signal Segmentation fault (11)"

Question

我正在使用 Apache/PHP/MySQL 堆栈。
作为框架使用 CakePHP。

我时不时地得到一个空白的白页。我无法通过 Cake 调试它，所以我查看了 apache error.log，这是我得到的:

[Wed Oct 12 15:27:23 2011] [notice] child pid 3580 exit signal Segmentation fault (11)
[Wed Oct 12 15:27:34 2011] [notice] child pid 3581 exit signal Segmentation fault (11)
[Wed Oct 12 15:30:52 2011] [notice] child pid 3549 exit signal Segmentation fault (11)
[Wed Oct 12 16:04:27 2011] [notice] child pid 3579 exit signal Segmentation fault (11)
zend_mm_heap corrupted
[Wed Oct 12 16:26:24 2011] [notice] child pid 3625 exit signal Segmentation fault (11)
[Wed Oct 12 17:57:24 2011] [notice] child pid 3577 exit signal Segmentation fault (11)
[Wed Oct 12 17:58:54 2011] [notice] child pid 3550 exit signal Segmentation fault (11)
[Wed Oct 12 17:59:52 2011] [notice] child pid 3578 exit signal Segmentation fault (11)
[Wed Oct 12 18:01:38 2011] [notice] child pid 3683 exit signal Segmentation fault (11)
[Wed Oct 12 22:20:53 2011] [notice] child pid 3778 exit signal Segmentation fault (11)
[Wed Oct 12 22:29:51 2011] [notice] child pid 3777 exit signal Segmentation fault (11)
[Wed Oct 12 22:33:42 2011] [notice] child pid 3774 exit signal Segmentation fault (11)

什么是段错误，我该如何解决？

更新:

PHP Version 5.3.4, OSX local development
Server version: Apache/2.2.17 (Unix)
CakePhp: 1.3.10

Answer 1

将 gdb 附加到 httpd 子进程之一并重新加载或继续工作并等待崩溃，然后查看回溯。做这样的事情:

$ ps -ef|grep httpd
0     681     1   0 10:38pm ??         0:00.45 /Applications/MAMP/Library/bin/httpd -k start
501   690   681   0 10:38pm ??         0:00.02 /Applications/MAMP/Library/bin/httpd -k start

...

现在将 gdb 附加到其中一个子进程，在本例中为 PID 690(列是 UID、PID、PPID...)

$ sudo gdb
(gdb) attach 690
Attaching to process 690.
Reading symbols for shared libraries . done
Reading symbols for shared libraries ....................... done
0x9568ce29 in accept$NOCANCEL$UNIX2003 ()
(gdb) c
Continuing.

等待崩溃...然后:

(gdb) backtrace

或者

(gdb) backtrace full

应该给你一些线索是怎么回事。如果您提交错误报告，则应包括回溯。

如果崩溃难以重现，最好将 Apache 配置为仅使用一个子进程来处理请求。配置是这样的:

StartServers 1
MinSpareServers 1
MaxSpareServers 1