[提交缺陷]Swoole2.X版本提供PHP原生协程支持实践，Http请求部分的$httpclient->setDefer();该行出现段错误的可能是Bug提交示例。
背景：研究一下这个Swoole2.X（V2.0.8）的协程,于是试了一下Tcp/Mysql/Redis/Http(在一个以Http形式下，协程了：TcpServer配置、Redis配置、Mysql配置、Http，最后的接口返回时间以里面最长的那个为准，也就是一般是Mysql耗时最长，它就是最长的接口返回时间了。)一起上,Swoole顾问觉得要想性能高还得加上RPC，再就是在一些数据的Pack和Unpack性能上予以加强，以争取每个请求都非常快非常高效，一请求发现出现了段错误，最新版本出现小小的问题属于正常性况，关键是如何反馈问题，看了一下Swoole的Wiki是如何提Bug的连接，于是就试着提一个Bug吧，给其它用Swoole万一出现Coredump的兄弟们作一个示范，进行提Bug的和捕获相关的Coredump的输出，参考Swoole的Wiki，地址：https://wiki.swoole.com/wiki/page/10.html。
一、假如在你的项目中出现段错误，怎么办？重新编译打包Swoole的源码并打成RPm包，打开debug,参数是： --enable-debug ，如下：
swoole-php71-2.0.7.el7.x86_64.spec 打包./configure部分：
#./configure --with-php-config=%{php_bin}/php-config --enable-coroutine --enable-async-redis
./configure --with-php-config=%{php_bin}/php-config --enable-coroutine --enable-async-redis --enable-debug
二、Mysql部分做测试，加上用户权限，那个Tcp就用Swoole的示例打开9501端口，官网上有很简单的TcpServer样例（略），Mysql部分如下：
Mysql服务器上@101.200.*.135：
#mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 93109
Server version: 8.0.0-dmr-log Source distribution
mysql> grant all privileges on test.* to swooleUser@10.51.*.34 identified by "test123";
Query OK, 0 rows affected, 1 warning (0.04 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
@测试机器@123.57.*.183
#rpm -ql mysql-client-8.0.0-170523211353.el7.centos.x86_64
/usr/local/mysql/bin/mysql
#/usr/local/mysql/bin/mysql -h10.44.*.177 -uswooleUser -p
Enter password:
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| test |
+--------------------+
2 rows in set (0.00 sec)
三、根据TcpServer配置、Redis配置、Mysql配置、Http(试着访问百度的Http页面)，一般来讲都是Mysql慢，所以，它才是重点，代码如下：
coroutinemysql.php
<?php
$server = new Swoole\Http\Server("123.57.*.183", 9507, SWOOLE_BASE);
$server->set([
'worker_num' => 1,
]);
$server->on('Request', function ($request, $response) {
$tcpclient = new Swoole\Coroutine\Client(SWOOLE_SOCK_TCP);
$tcpclient->connect('127.0.0.1', 9501,0.5);
$tcpclient->send("hello world\n");
$redis = new Swoole\Coroutine\Redis();
$redis->connect('123.57.*.183', 6379);
$redis->setDefer();
$redis->get('key');
$mysql = new Swoole\Coroutine\MySQL();
$ret = $mysql->connect([
'host' => '10.44.*.177',
'port' => 3306,
'user' => 'swooleUser',
'password' => 'test123',
'database' => 'test',
]);
if ($ret == false) {
$response->end("MySQL connect fail!");
return;
}
$mysql->setDefer();
$mysql->query('select sleep(1)');
$httpclient = new Swoole\Coroutine\Http\Client('123.125.114.144', 80);
$httpclient->setHeaders(['Host' => "baidu.com"]);
$httpclient->set([ 'timeout' => 1]);
$httpclient->setDefer();
$httpclient->get('/');
$tcp_res = $tcpclient->recv();
$redis_res = $redis->recv();
$mysql_res = $mysql->recv();
$http_res = $httpclient->recv();
$response->end('Test End');
});
$server->start();
四、按Swoole官方的Wiki教程，设置一下吐核，From: https://wiki.swoole.com/wiki/page/10.html ：
#ulimit -c unlimited
五、启动对外提供的Http协议的9507端口访问进来后的多种协议并发的协程服务，如下：
#php coroutinemysql.php
六、访问Http时再触发一下协程：
触发一下：http://123.57.*.183:9507/
七、生成了段错误的Coredump文件，如下：
#php coroutinemysql.php
段错误(吐核)
#ls *core*
core.8494
八、用GDB去跟进其堆栈，BT显示调用层级定位出现问题所在位置：
#gdb php /tmp/core.8494
(gdb) bt
#0 0x00007f146b33e9a5 in http_client_coro_send_http_request (zobject=0x7f147248d190)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/swoole_http_client_coro.c:501
#1 0x00007f146b383c93 in swClient_onWrite (reactor=<optimized out>, event=0x7ffd0c185a10)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/Client.c:1109
#2 0x00007f146b37d63c in swReactorEpoll_wait (reactor=0x1dfc338, timeo=<optimized out>)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/reactor/ReactorEpoll.c:270
#3 0x00007f146b389de9 in swReactorProcess_loop (pool=<optimized out>,
worker=worker@entry=0x7ffd0c185ae0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/ReactorProcess.c:379
#4 0x00007f146b38a727 in swReactorProcess_start (serv=serv@entry=0x1dc7cf0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/ReactorProcess.c:112
#5 0x00007f146b381538 in swServer_start (serv=serv@entry=0x1dc7cf0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/Server.c:696
#6 0x00007f146b333730 in zim_swoole_http_server_start (execute_data=0x7f14724130a0,
return_value=0x7ffd0c185cb0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/swoole_http_server.c:1567
#7 0x00000000008ad0c6 in ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER ()
#8 0x000000000085bd3b in execute_ex ()
#9 0x00000000008aee24 in zend_execute ()
#10 0x0000000000816fc4 in zend_execute_scripts ()
#11 0x00000000007b8520 in php_execute_script ()
#12 0x00000000008b0fbf in do_cli ()
#13 0x000000000043d450 in main ()
(gdb)f 1
#1 0x00007f146b383c93 in swClient_onWrite (reactor=<optimized out>, event=0x7ffd0c185a10)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/Client.c:1109
1109 cli->onConnect(cli);
(gdb)f 0
#0 0x00007f146b33e9a5 in http_client_coro_send_http_request (zobject=0x7f147248d190)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/swoole_http_client_coro.c:501
501 if (!http->cli || !http->cli->socket )
九、用valgrind大体排查一下是否有内存溢出等：
[root@测试服务器:/tmp]
#USE_ZEND_ALLOC=0 valgrind php coroutinemysql.php
==12833== Memcheck, a memory error detector
==12833== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==12833== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==12833== Command: php coroutinemysql.php
==12833==
==12833== Invalid read of size 8
==12833== at 0x121249A5: http_client_coro_send_http_request (swoole_http_client_coro.c:501)
==12833== by 0x12169C92: swClient_onWrite (Client.c:1109)
==12833== by 0x1216363B: swReactorEpoll_wait (ReactorEpoll.c:270)
==12833== by 0x1216FDE8: swReactorProcess_loop (ReactorProcess.c:379)
==12833== by 0x12170726: swReactorProcess_start (ReactorProcess.c:112)
==12833== by 0x12167537: swServer_start (Server.c:696)
==12833== by 0x1211972F: zim_swoole_http_server_start (swoole_http_server.c:1567)
==12833== by 0x8AD0C5: ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER (in /usr/local/php/bin/php)
==12833== by 0x85BD3A: execute_ex (in /usr/local/php/bin/php)
==12833== by 0x8AEE23: zend_execute (in /usr/local/php/bin/php)
==12833== by 0x816FC3: zend_execute_scripts (in /usr/local/php/bin/php)
==12833== by 0x7B851F: php_execute_script (in /usr/local/php/bin/php)
==12833== Address 0x100000188 is not stack'd, malloc'd or (recently) free'd
==12833==
==12833==
==12833== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==12833== Access not within mapped region at address 0x100000188
==12833== at 0x121249A5: http_client_coro_send_http_request (swoole_http_client_coro.c:501)
==12833== by 0x12169C92: swClient_onWrite (Client.c:1109)
==12833== by 0x1216363B: swReactorEpoll_wait (ReactorEpoll.c:270)
==12833== by 0x1216FDE8: swReactorProcess_loop (ReactorProcess.c:379)
==12833== by 0x12170726: swReactorProcess_start (ReactorProcess.c:112)
==12833== by 0x12167537: swServer_start (Server.c:696)
==12833== by 0x1211972F: zim_swoole_http_server_start (swoole_http_server.c:1567)
==12833== by 0x8AD0C5: ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER (in /usr/local/php/bin/php)
==12833== by 0x85BD3A: execute_ex (in /usr/local/php/bin/php)
==12833== by 0x8AEE23: zend_execute (in /usr/local/php/bin/php)
==12833== by 0x816FC3: zend_execute_scripts (in /usr/local/php/bin/php)
==12833== by 0x7B851F: php_execute_script (in /usr/local/php/bin/php)
==12833== If you believe this happened as a result of a stack
==12833== overflow in your program's main thread (unlikely but
==12833== possible), you can try to increase the size of the
==12833== main thread stack using the --main-stacksize= flag.
==12833== The main thread stack size used in this run was 8388608.
==12833==
==12833== HEAP SUMMARY:
==12833== in use at exit: 22,357,752 bytes in 22,711 blocks
==12833== total heap usage: 29,852 allocs, 7,141 frees, 23,257,973 bytes allocated
==12833==
==12833== LEAK SUMMARY:
==12833== definitely lost: 64 bytes in 2 blocks
==12833== indirectly lost: 4,096 bytes in 2 blocks
==12833== possibly lost: 1,813,286 bytes in 18,399 blocks
==12833== still reachable: 20,540,306 bytes in 4,308 blocks
==12833== suppressed: 0 bytes in 0 blocks
==12833== Rerun with --leak-check=full to see details of leaked memory
==12833==
==12833== For counts of detected and suppressed errors, rerun with: -v
==12833== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
段错误
十、在PHP代码上加加减减，定位一下PHP这个协程是哪个协议出现问题，经定位发现是发起http这块的协程可能有问题，如下：
再细节一点：
#php coroutinemysql.php
段错误(吐核)
这一行引起的：$httpclient->setDefer(); #setDefer函数的Wiki地址：https://wiki.swoole.com/wiki/page/607.html
$httpclient = new Swoole\Coroutine\Http\Client('123.125.114.144', 80);
$httpclient->setHeaders(['Host' => "baidu.com"]);
$httpclient->set([ 'timeout' => 3]);
$httpclient->setDefer(); #注释这一行，就会报下面的警告，不会Coredump，如下：
$httpclient->get('/');
#php coroutinemysql.php #浏览器访问一下：http://123.57.*.183:9507/
PHP Warning: Swoole\Coroutine\Http\Client::recv(): you should not use recv without defer in /tmp/coroutinemysql.php on line 40
PHP Warning: Swoole\Coroutine\Http\Client::recv(): you should not use recv without defer in /tmp/coroutinemysql.php on line 40
在服务器上CURL形式访问一下百度，没毛病：
curl -i -H"Host:baidu.com" http://123.125.114.144
HTTP/1.1 200 OK
<html>
<meta http-equiv=refresh content=0;url=http://www.baidu.com/>
</html>
十一、提交出现Coredump以及和环境相关的问题给Swoole的CoreTeam研发小组的兄弟：
请将上面的得到的信息，连同机器信息，包括php -v gcc -v uname -a 提交到Github Issues页面或者发送邮件到 team@swoole.com。
若确定是Swoole的问题，开发组会快速解决问题。
其它涉及到编译器和PHP版本、系统环境：
#php -v
PHP 7.1.5 (cli) (built: May 23 2017 10:35:57) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.1.5, Copyright (c) 1999-2017, by Zend Technologies
#gcc -v
使用内建 specs。
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
目标：x86_64-redhat-linux
配置为：../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
线程模型：posix
gcc 版本 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)
#uname -a
Linux 测试服务器 4.11.2-1.el7.elrepo.x86_64 #1 SMP Sun May 21 19:31:34 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux
#php --ri swoole
swoole
swoole support => enabled
Version => 2.0.8
Author => tianfeng.han[email: mikan.tenny@gmail.com]
epoll => enabled
eventfd => enabled
timerfd => enabled
signalfd => enabled
cpu affinity => enabled
spinlock => enabled
rwlock => enabled
async redis client => enabled
async http/websocket client => enabled
Linux Native AIO => enabled
pcre => enabled
zlib => enabled
mutex_timedlock => enabled
pthread_barrier => enabled
Directive => Local Value => Master Value
swoole.aio_thread_num => 2 => 2
swoole.display_errors => On => On
swoole.use_namespace => On => On
swoole.fast_serialize => 1 => 1
swoole.unixsock_buffer_size => 8388608 => 8388608
EOF
一、假如在你的项目中出现段错误，怎么办？重新编译打包Swoole的源码并打成RPm包，打开debug,参数是： --enable-debug ，如下：
swoole-php71-2.0.7.el7.x86_64.spec 打包./configure部分：
#./configure --with-php-config=%{php_bin}/php-config --enable-coroutine --enable-async-redis
./configure --with-php-config=%{php_bin}/php-config --enable-coroutine --enable-async-redis --enable-debug
二、Mysql部分做测试，加上用户权限，那个Tcp就用Swoole的示例打开9501端口，官网上有很简单的TcpServer样例（略），Mysql部分如下：
Mysql服务器上@101.200.*.135：
#mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 93109
Server version: 8.0.0-dmr-log Source distribution
mysql> grant all privileges on test.* to swooleUser@10.51.*.34 identified by "test123";
Query OK, 0 rows affected, 1 warning (0.04 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)
@测试机器@123.57.*.183
#rpm -ql mysql-client-8.0.0-170523211353.el7.centos.x86_64
/usr/local/mysql/bin/mysql
#/usr/local/mysql/bin/mysql -h10.44.*.177 -uswooleUser -p
Enter password:
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| test |
+--------------------+
2 rows in set (0.00 sec)
三、根据TcpServer配置、Redis配置、Mysql配置、Http(试着访问百度的Http页面)，一般来讲都是Mysql慢，所以，它才是重点，代码如下：
coroutinemysql.php
<?php
$server = new Swoole\Http\Server("123.57.*.183", 9507, SWOOLE_BASE);
$server->set([
'worker_num' => 1,
]);
$server->on('Request', function ($request, $response) {
$tcpclient = new Swoole\Coroutine\Client(SWOOLE_SOCK_TCP);
$tcpclient->connect('127.0.0.1', 9501,0.5);
$tcpclient->send("hello world\n");
$redis = new Swoole\Coroutine\Redis();
$redis->connect('123.57.*.183', 6379);
$redis->setDefer();
$redis->get('key');
$mysql = new Swoole\Coroutine\MySQL();
$ret = $mysql->connect([
'host' => '10.44.*.177',
'port' => 3306,
'user' => 'swooleUser',
'password' => 'test123',
'database' => 'test',
]);
if ($ret == false) {
$response->end("MySQL connect fail!");
return;
}
$mysql->setDefer();
$mysql->query('select sleep(1)');
$httpclient = new Swoole\Coroutine\Http\Client('123.125.114.144', 80);
$httpclient->setHeaders(['Host' => "baidu.com"]);
$httpclient->set([ 'timeout' => 1]);
$httpclient->setDefer();
$httpclient->get('/');
$tcp_res = $tcpclient->recv();
$redis_res = $redis->recv();
$mysql_res = $mysql->recv();
$http_res = $httpclient->recv();
$response->end('Test End');
});
$server->start();
四、按Swoole官方的Wiki教程，设置一下吐核，From: https://wiki.swoole.com/wiki/page/10.html ：
#ulimit -c unlimited
五、启动对外提供的Http协议的9507端口访问进来后的多种协议并发的协程服务，如下：
#php coroutinemysql.php
六、访问Http时再触发一下协程：
触发一下：http://123.57.*.183:9507/
七、生成了段错误的Coredump文件，如下：
#php coroutinemysql.php
段错误(吐核)
#ls *core*
core.8494
八、用GDB去跟进其堆栈，BT显示调用层级定位出现问题所在位置：
#gdb php /tmp/core.8494
(gdb) bt
#0 0x00007f146b33e9a5 in http_client_coro_send_http_request (zobject=0x7f147248d190)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/swoole_http_client_coro.c:501
#1 0x00007f146b383c93 in swClient_onWrite (reactor=<optimized out>, event=0x7ffd0c185a10)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/Client.c:1109
#2 0x00007f146b37d63c in swReactorEpoll_wait (reactor=0x1dfc338, timeo=<optimized out>)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/reactor/ReactorEpoll.c:270
#3 0x00007f146b389de9 in swReactorProcess_loop (pool=<optimized out>,
worker=worker@entry=0x7ffd0c185ae0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/ReactorProcess.c:379
#4 0x00007f146b38a727 in swReactorProcess_start (serv=serv@entry=0x1dc7cf0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/ReactorProcess.c:112
#5 0x00007f146b381538 in swServer_start (serv=serv@entry=0x1dc7cf0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/Server.c:696
#6 0x00007f146b333730 in zim_swoole_http_server_start (execute_data=0x7f14724130a0,
return_value=0x7ffd0c185cb0)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/swoole_http_server.c:1567
#7 0x00000000008ad0c6 in ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER ()
#8 0x000000000085bd3b in execute_ex ()
#9 0x00000000008aee24 in zend_execute ()
#10 0x0000000000816fc4 in zend_execute_scripts ()
#11 0x00000000007b8520 in php_execute_script ()
#12 0x00000000008b0fbf in do_cli ()
#13 0x000000000043d450 in main ()
(gdb)f 1
#1 0x00007f146b383c93 in swClient_onWrite (reactor=<optimized out>, event=0x7ffd0c185a10)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/src/network/Client.c:1109
1109 cli->onConnect(cli);
(gdb)f 0
#0 0x00007f146b33e9a5 in http_client_coro_send_http_request (zobject=0x7f147248d190)
at /home/test/rpmbuild/BUILD/swoole-src-2.0.7-stable/swoole_http_client_coro.c:501
501 if (!http->cli || !http->cli->socket )
九、用valgrind大体排查一下是否有内存溢出等：
[root@测试服务器:/tmp]
#USE_ZEND_ALLOC=0 valgrind php coroutinemysql.php
==12833== Memcheck, a memory error detector
==12833== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==12833== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==12833== Command: php coroutinemysql.php
==12833==
==12833== Invalid read of size 8
==12833== at 0x121249A5: http_client_coro_send_http_request (swoole_http_client_coro.c:501)
==12833== by 0x12169C92: swClient_onWrite (Client.c:1109)
==12833== by 0x1216363B: swReactorEpoll_wait (ReactorEpoll.c:270)
==12833== by 0x1216FDE8: swReactorProcess_loop (ReactorProcess.c:379)
==12833== by 0x12170726: swReactorProcess_start (ReactorProcess.c:112)
==12833== by 0x12167537: swServer_start (Server.c:696)
==12833== by 0x1211972F: zim_swoole_http_server_start (swoole_http_server.c:1567)
==12833== by 0x8AD0C5: ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER (in /usr/local/php/bin/php)
==12833== by 0x85BD3A: execute_ex (in /usr/local/php/bin/php)
==12833== by 0x8AEE23: zend_execute (in /usr/local/php/bin/php)
==12833== by 0x816FC3: zend_execute_scripts (in /usr/local/php/bin/php)
==12833== by 0x7B851F: php_execute_script (in /usr/local/php/bin/php)
==12833== Address 0x100000188 is not stack'd, malloc'd or (recently) free'd
==12833==
==12833==
==12833== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==12833== Access not within mapped region at address 0x100000188
==12833== at 0x121249A5: http_client_coro_send_http_request (swoole_http_client_coro.c:501)
==12833== by 0x12169C92: swClient_onWrite (Client.c:1109)
==12833== by 0x1216363B: swReactorEpoll_wait (ReactorEpoll.c:270)
==12833== by 0x1216FDE8: swReactorProcess_loop (ReactorProcess.c:379)
==12833== by 0x12170726: swReactorProcess_start (ReactorProcess.c:112)
==12833== by 0x12167537: swServer_start (Server.c:696)
==12833== by 0x1211972F: zim_swoole_http_server_start (swoole_http_server.c:1567)
==12833== by 0x8AD0C5: ZEND_DO_FCALL_SPEC_RETVAL_UNUSED_HANDLER (in /usr/local/php/bin/php)
==12833== by 0x85BD3A: execute_ex (in /usr/local/php/bin/php)
==12833== by 0x8AEE23: zend_execute (in /usr/local/php/bin/php)
==12833== by 0x816FC3: zend_execute_scripts (in /usr/local/php/bin/php)
==12833== by 0x7B851F: php_execute_script (in /usr/local/php/bin/php)
==12833== If you believe this happened as a result of a stack
==12833== overflow in your program's main thread (unlikely but
==12833== possible), you can try to increase the size of the
==12833== main thread stack using the --main-stacksize= flag.
==12833== The main thread stack size used in this run was 8388608.
==12833==
==12833== HEAP SUMMARY:
==12833== in use at exit: 22,357,752 bytes in 22,711 blocks
==12833== total heap usage: 29,852 allocs, 7,141 frees, 23,257,973 bytes allocated
==12833==
==12833== LEAK SUMMARY:
==12833== definitely lost: 64 bytes in 2 blocks
==12833== indirectly lost: 4,096 bytes in 2 blocks
==12833== possibly lost: 1,813,286 bytes in 18,399 blocks
==12833== still reachable: 20,540,306 bytes in 4,308 blocks
==12833== suppressed: 0 bytes in 0 blocks
==12833== Rerun with --leak-check=full to see details of leaked memory
==12833==
==12833== For counts of detected and suppressed errors, rerun with: -v
==12833== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
段错误
十、在PHP代码上加加减减，定位一下PHP这个协程是哪个协议出现问题，经定位发现是发起http这块的协程可能有问题，如下：
再细节一点：
#php coroutinemysql.php
段错误(吐核)
这一行引起的：$httpclient->setDefer(); #setDefer函数的Wiki地址：https://wiki.swoole.com/wiki/page/607.html
$httpclient = new Swoole\Coroutine\Http\Client('123.125.114.144', 80);
$httpclient->setHeaders(['Host' => "baidu.com"]);
$httpclient->set([ 'timeout' => 3]);
$httpclient->setDefer(); #注释这一行，就会报下面的警告，不会Coredump，如下：
$httpclient->get('/');
#php coroutinemysql.php #浏览器访问一下：http://123.57.*.183:9507/
PHP Warning: Swoole\Coroutine\Http\Client::recv(): you should not use recv without defer in /tmp/coroutinemysql.php on line 40
PHP Warning: Swoole\Coroutine\Http\Client::recv(): you should not use recv without defer in /tmp/coroutinemysql.php on line 40
在服务器上CURL形式访问一下百度，没毛病：
curl -i -H"Host:baidu.com" http://123.125.114.144
HTTP/1.1 200 OK
<html>
<meta http-equiv=refresh content=0;url=http://www.baidu.com/>
</html>
十一、提交出现Coredump以及和环境相关的问题给Swoole的CoreTeam研发小组的兄弟：
请将上面的得到的信息，连同机器信息，包括php -v gcc -v uname -a 提交到Github Issues页面或者发送邮件到 team@swoole.com。
若确定是Swoole的问题，开发组会快速解决问题。
其它涉及到编译器和PHP版本、系统环境：
#php -v
PHP 7.1.5 (cli) (built: May 23 2017 10:35:57) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
with Zend OPcache v7.1.5, Copyright (c) 1999-2017, by Zend Technologies
#gcc -v
使用内建 specs。
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
目标：x86_64-redhat-linux
配置为：../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
线程模型：posix
gcc 版本 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)
#uname -a
Linux 测试服务器 4.11.2-1.el7.elrepo.x86_64 #1 SMP Sun May 21 19:31:34 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux
#php --ri swoole
swoole
swoole support => enabled
Version => 2.0.8
Author => tianfeng.han[email: mikan.tenny@gmail.com]
epoll => enabled
eventfd => enabled
timerfd => enabled
signalfd => enabled
cpu affinity => enabled
spinlock => enabled
rwlock => enabled
async redis client => enabled
async http/websocket client => enabled
Linux Native AIO => enabled
pcre => enabled
zlib => enabled
mutex_timedlock => enabled
pthread_barrier => enabled
Directive => Local Value => Master Value
swoole.aio_thread_num => 2 => 2
swoole.display_errors => On => On
swoole.use_namespace => On => On
swoole.fast_serialize => 1 => 1
swoole.unixsock_buffer_size => 8388608 => 8388608
EOF
作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：https://jackxiang.com/post/9206/
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