夜行人

开始前，先看下这篇文章，（猛击此处） Redhat Linux下如何生成core dump文件

看完后，开工
vi /root/.bash_profile
加入ulimit -S -c unlimited > /dev/null 2>&1
保存退出，重新加载配置
source /root/.bash_profile

经研究发现，只要把
/usr/local/php/bin/php-cgi --fpm --fpm-config /usr/local/php/etc/php-fpm.conf
放到脚本里都会报
Segmentation fault

vi /root/test.sh
添加
/usr/local/php/bin/php-cgi --fpm --fpm-config /usr/local/php/etc/php-fpm.conf

cd /root
sh test.sh
这是它会报Segmentation fault，并在/root下产生一个core.28522文件，这个文件名后面的数字是随机的
现在我们来看下core.28522里面到底是什么内容,需要用到gdb这个工具

yum -y install gdb

gdb使用的方法是
gdb 产生core时执行的命令 core文件

gdb /usr/local/php/bin/php-cgi core.28522

我们在最后会看到
Core was generated by `/usr/local/php/bin/php-cgi --fpm --fpm-config /usr/local/php/etc/php-fpm.conf'.
Program terminated with signal 11, Segmentation fault.
#0 0x00007f895e2df0b8 in eaccelerator_clean_shutdown ()
from /usr/local/php/lib/php/extensions/no-debug-zts-20060613/eaccelerator.so

由此，我们定位到是EA导致整个段错误的

CentOS 6 64位版本,默认是不会安装32位软件的,这样就导致我们在安装PHP前安装的库,只会有64位版本

例如
yum -y install libjpeg libjpeg-devel libpng libpng-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel mhash freetype freetype-devel

这样安装,系统默认只会安装64位版本,假设我们用以下命令去安装PHP

CHOST="x86_64-pc-linux-gnu" CFLAGS="-march=nocona -O2 -pipe" CXXFLAGS="-march=nocona -O2 -pipe" \
./configure --prefix=/usr/local/php \
--with-config-file-path=/etc \
--with-mysql=/usr/loca/mysql --with-pdo-mysql=/usr/local/mysql/bin/mysql_config \
--with-mysqli=/usr/local/mysql/bin/mysql_config \
--with-iconv-dir=/usr/local \
--with-freetype-dir --with-jpeg-dir \
--with-png-dir --with-ttf \
--enable-zip --with-zlib \
--with-gd \
--disable-rpath --enable-discard-path \
--enable-safe-mode --enable-bcmath \
--enable-shmop --enable-sysvsem \
--with-curl --with-curlwrappers \
--enable-fastcgi --enable-force-cgi-redirect \
--enable-mbstring --with-mcrypt \
--disable-ipv6 \
--enable-static \
--enable-maintainer-zts \
--enable-zend-multibyte \
--enable-sockets \
--enable-soap \
--with-openssl \
--without-sqlite --without-pdo-sqlite

则会提示
configure: error: libjpeg.(a|so) not found.

通过rpm -qa |grep libjpeg是有安装的

解决办法是在configure里加入

--with-libdir=lib64

修改后是这样

CHOST="x86_64-pc-linux-gnu" CFLAGS="-march=nocona -O2 -pipe" CXXFLAGS="-march=nocona -O2 -pipe" \
./configure --prefix=/usr/local/php \
--with-libdir=lib64 \
--with-config-file-path=/etc \
--with-mysql=/usr/loca/mysql --with-pdo-mysql=/usr/local/mysql/bin/mysql_config \
--with-mysqli=/usr/local/mysql/bin/mysql_config \
--with-iconv-dir=/usr/local \
--with-freetype-dir --with-jpeg-dir \
--with-png-dir --with-ttf \
--enable-zip --with-zlib \
--with-gd \
--disable-rpath --enable-discard-path \
--enable-safe-mode --enable-bcmath \
--enable-shmop --enable-sysvsem \
--with-curl --with-curlwrappers \
--enable-fastcgi --enable-force-cgi-redirect \
--enable-mbstring --with-mcrypt \
--disable-ipv6 \
--enable-static \
--enable-maintainer-zts \
--enable-zend-multibyte \
--enable-sockets \
--enable-soap \
--with-openssl \
--without-sqlite --without-pdo-sqlite

不过,由于我们MySQL不是用rpm包装的,是自编译安装在/usr/local/mysql
如果使用以上configure参数,则会提示

configure: error: Cannot find libmysqlclient_r under /usr/local/mysql/.
Note that the MySQL client library is not bundled anymore!

此时做个修改

ln -s /usr/local/mysql/lib /usr/local/mysql/lib64

这样就可以configure通过了,然后就make && make install吧

题外话,如果要在CentOS6 64位上yum安装32位的软件
echo 'multilib_policy=all' >> /etc/yum.conf
就可以了