Piwik page stuck problem tracing record

Today, piwik is boring, but it is found that there is a probability that the page will be 504. Viewing nginx logs is a php Execution timeout, and after the first 504, all the subsequent page accesses will be 504, after restarting php-fpm, you can access it again. Leo108.compid-2007. asp is used to open the slowlog of php-fpm. When the page is 504, slowl

Today, piwik is boring, but it is found that there is a probability that the page will be 504. Viewing nginx logs is a php Execution timeout, and after the first 504, all the subsequent page accesses will be 504, after restarting php-fpm, you can access it again. The http://leo108.com/pid-2007.asp opened the slowlog of php-fpm and slowl at page 504.

Today, piwik is boring, but it is found that there is a probability that the page will be 504. Viewing nginx logs is a php Execution timeout, and after the first 504, all the subsequent page accesses will be 504, after restarting php-fpm, you can access it again. Http://leo108.com/pid-2007.asp

So open the php-fpm slowlog, in the page 504 slowlog also played the corresponding call Stack: This article from http://leo108.com

script_filename = /home/www/online/website/piwik/index.php[0x00007fbec1568f48] session_start() /home/www/online/website/piwik/libs/Zend/Session.php:469[0x00007fbec1568370] start() /home/www/online/website/piwik/core/Session.php:113[0x00007fbec1567e68] start() /home/www/online/website/piwik/core/FrontController.php:416[0x00007fbec1567a08] prepareDispatch() /home/www/online/website/piwik/core/FrontController.php:502[0x00007fbec15675f8] doDispatch() /home/www/online/website/piwik/core/FrontController.php:84[0x00007fbec15671d0] dispatch() /home/www/online/website/piwik/core/dispatch.php:34[0x00007fbec15669a0] +++ dump failed

It seems that the execution of session_start is stuck, and the php session has a lock mechanism. If a session is enabled on a page and the request has not ended, all subsequent requests for this session will be locked and wait until the previous request ends. This article from http://leo108.com

That is to say, the reason why the piwki page is stuck is that a previous request has not ended, but which one has not ended? Because I didn't read the piwik code, and 504 appeared with a probability, it wasn't 504 after accessing a specific page. The problem encountered a bottleneck.

Zombie JJ

After half a day of drumming, I suddenly thought that the unfinished request would definitely be in the slowlog of php, so I checked it again, different logs are found in the slowlog of a bunch of sessions: PHP

script_filename = /home/www/online/website/piwik/index.php[0x00007fbec1568c40] curl_exec() /home/www/online/website/piwik/core/Http.php:483[0x00007fbec1568798] sendHttpRequestBy() /home/www/online/website/piwik/core/Http.php:94[0x00007fbec15685e0] sendHttpRequest() /home/www/online/website/piwik/core/Http.php:720[0x00007fbec1567e00] fetchRemoteFile() /home/www/online/website/piwik/plugins/ExampleRssWidget/RssRenderer.php:46[0x00007fbec1567be8] get() /home/www/online/website/piwik/plugins/ExampleRssWidget/Controller.php:25[0x00007fffe0d3cf00] rssPiwik() unknown:0[0x00007fbec1567788] call_user_func_array() /home/www/online/website/piwik/core/FrontController.php:531[0x00007fbec1567378] doDispatch() /home/www/online/website/piwik/core/FrontController.php:84[0x00007fbec1566f50] dispatch() /home/www/online/website/piwik/core/dispatch.php:34[0x00007fbec1566720] +++ dump failed

It looks like a curl calls an http request and traces the code in it. It is a public class and it is not a fixed request for a url. This is also simple, in curl_exec () add a logging code to record the curl request url.

PHP

So I casually noted down the piwik page, found that there is a record of a url: http://feeds.feedburner.com/Piwik

PHP

It looks like an rss url, directly in the grep url of piwik. The result is as follows: piwik

./plugins/ExampleRssWidget/Controller.php:            $rss = new RssRenderer('http://feeds.feedburner.com/Piwik');./plugins/ExampleRssWidget/Controller.php:            $rss = new RssRenderer('http://feeds.feedburner.com/PiwikReleases');

Is the code of a plug-in. Piwik

Go to the piwik background and disable ExampleRssWidget. Solve the problem!

This article from http://leo108.com

PS: China's national conditions ........................

Http://leo108.com/pid-2007.asp