PHP - curl_exec 挂起

Question

我在使用下面的 php 函数时遇到了一个奇怪的问题。不幸的是，这是那些特殊的“仅限生产”案例之一。

function requestPost($url, $data)
{
        set_time_limit(60);
        $output = array();
        $curlSession = curl_init();

        if($curlSession == false)
                syslog(LOG_INFO,"Falied to create a curl sessions");

        // Set the URL
        curl_setopt ($curlSession, CURLOPT_URL, $url);
        // No headers, please
        curl_setopt ($curlSession, CURLOPT_HEADER, 0);
        // It's a POST request
        curl_setopt ($curlSession, CURLOPT_POST, 1);
        // Set the fields for the POST
        curl_setopt ($curlSession, CURLOPT_POSTFIELDS, $data);
        // Return it direct, don't print it out
        curl_setopt($curlSession, CURLOPT_RETURNTRANSFER,1);
        // This connection will timeout in 30 seconds
        curl_setopt($curlSession, CURLOPT_TIMEOUT,30);
        //The next two lines must be present for the kit to work with newer version of cURL
        //You should remove them if you have any problems in earlier versions of cURL
        curl_setopt($curlSession, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curlSession, CURLOPT_SSL_VERIFYHOST, 1);

        //Send the request and store the result in an array
        syslog(LOG_INFO,"base.php::requestPost() :  BEFORE SENDING CURL ");

        $rawresponse = curl_exec($curlSession);

}

PHP 5.3.6 (cli) (built: Mar 17 2011 21:19:28) 
curl Version          : 7.20.1
NSS Version           : 3.12.9
apr Version           : 1.4.5
Php Version           : 5.3.6

这似乎随机卡在 curl_exec。我不是 php 开发人员，所以我不知道从哪里开始。

我注意到当 curl 请求“挂起”时，在停止 httpd 守护进程时它会尝试发送这些请求，因此看起来它们可能正在缓冲或卡在 httpd 服务器中。任何指针将不胜感激。

编辑:我设法从 Web 服务器中获取堆栈跟踪信息。

(gdb) where
#0  0x00c15416 in __kernel_vsyscall ()
#1  0x002f522c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x00a73a9d in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libc.so.6
#3  0x00b9b869 in PR_WaitCondVar () from /lib/libnspr4.so
#4  0x00809c0f in NSSRWLock_LockWrite_Util () from /usr/lib/libnssutil3.so
#5  0x05e9ae0e in ?? () from /usr/lib/libnss3.so
#6  0x05ebd014 in ?? () from /usr/lib/libnss3.so
#7  0x05ebd60d in ?? () from /usr/lib/libnss3.so
#8  0x05eb0506 in SECMOD_LoadModule () from /usr/lib/libnss3.so
#9  0x05eb047f in SECMOD_LoadModule () from /usr/lib/libnss3.so
#10 0x05e7c007 in ?? () from /usr/lib/libnss3.so
#11 0x05e7c95e in NSS_Initialize () from /usr/lib/libnss3.so
#12 0x008e8609 in ?? () from /usr/lib/libcurl.so.4
#13 0x008e9215 in Curl_nss_connect () from /usr/lib/libcurl.so.4
#14 0x008df9a3 in Curl_ssl_connect () from /usr/lib/libcurl.so.4
#15 0x008bc1fa in Curl_http_connect () from /usr/lib/libcurl.so.4
#16 0x008c44c6 in Curl_protocol_connect () from /usr/lib/libcurl.so.4
#17 0x008c5075 in ?? () from /usr/lib/libcurl.so.4
#18 0x008c58cf in Curl_async_resolved () from /usr/lib/libcurl.so.4
#19 0x008d1b2f in Curl_perform () from /usr/lib/libcurl.so.4
#20 0x008d2a74 in curl_easy_perform () from /usr/lib/libcurl.so.4
#21 0x006b4693 in ?? () from /usr/lib/php/modules/curl.so
#22 0x056e4ac9 in ?? () from /etc/httpd/modules/libphp5.so
#23 0x056bb87e in execute () from /etc/httpd/modules/libphp5.so
#24 0x05693a66 in zend_execute_scripts () from /etc/httpd/modules/libphp5.so
#25 0x05639cb6 in php_execute_script () from /etc/httpd/modules/libphp5.so
#26 0x057236b3 in ?? () from /etc/httpd/modules/libphp5.so
#27 0x00dc6421 in ap_run_handler ()
#28 0x00dca166 in ap_invoke_handler ()
#29 0x00dd6fa8 in ap_process_request ()
#30 0x00dd39e8 in ?? ()
#31 0x00dcec71 in ap_run_process_connection ()
#32 0x00ddc44a in ?? ()
#33 0x00ddc7ee in ?? ()
#34 0x00ddd793 in ap_mpm_run ()
#35 0x00db0ab2 in main ()

它似乎卡在 pthread_condition 等待状态。有人有线索吗 ？同样的请求每次都通过命令行成功；所以它确实指向图书馆。

编辑:

以下是它永远不会发出的调用。

* About to connect() to live.sagepay.com port 443 (#0)
*   Trying x.x.x.x... * connected
* Connected to live.sagepay.com (x.x.x.x) port 443 (#0)
* warning: ignoring unsupported value (1) of ssl.verifyhost
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using SSL_RSA_WITH_RC4_128_MD5
* Server certificate:
*       subject: CN=live.sagepay.com,OU="Member, VeriSign Trust Network",OU=Authenticated by VeriSign,OU=Terms of use at www.verisign.co.uk/rpa (c)05,OU=Sage,O=Sage (UK) Limited,L=Newcastle Upon Tyne,ST=TYNE AND WEAR,C=GB,serialNumber=x.x.x,OID.x.x.x=Private Organization,OID.x.x.x.x=GB
*       start date: Mar 05 00:00:00 2011 GMT
*       expire date: Mar 04 23:59:59 2013 GMT
*       common name: live.sagepay.com
*       issuer: CN=VeriSign Class 3 Extended Validation SSL SGC CA,OU=Terms of use at https://www.verisign.com/rpa (c)06,OU=VeriSign Trust Network,O="VeriSign, Inc.",C=US
> POST /gateway/service/vspserver-register.vsp HTTP/1.1^M
Host: live.sagepay.com^M
Accept: */*^M
Content-Length: 664^M
Content-Type: application/x-www-form-urlencoded^M
^M
< HTTP/1.1 200 OK^M
< Date: Wed, 15 Jun 2011 16:11:43 GMT^M
< Server: Microsoft-IIS/6.0^M
< X-Powered-By: ASP.NET^M
< Content-Language: en-GB^M
< Content-Length: 276^M
< Set-Cookie: NSC_wjq-tbhfqbz-dpn-ofx=xxxx;expires=Wed, 15-Jun-2011 16:48:26 GMT;path=/;secure;httponly^M
< ^M
* Connection #0 to host live.sagepay.com left intact

编辑:问题出在 NSS 上，使用 OpenSSL 重新编译了 curl 和更多的依赖项(libssh2)，到目前为止它似乎工作正常。

干杯!

Answer 1

在脚本末尾添加以下内容以获取失败原因

if( $rawresponse === false )
    syslog( LOG_INFO , "base.php::requestPost() : ".curl_error($curlSession) );

编辑 1

这可能是 curl 的内部问题。在所有检查之前，所有服务器运行时都是最新的(至少是 php、php-curl 和 apache)。检查他们所有的日志.......然后我会建议比较几个生产环境或开发/测试环境之间的结果。

最后尝试缩小可以重现您的问题的最小测试用例并发布测试用例的完整代码。