Edit report at http://bugs.php.net/bug.php?id=52083&edit=1
ID: 52083 User updated by: darylp at qualtrics dot com Reported by: darylp at qualtrics dot com Summary: Fatal Error "Call to a member function * on a non-object" occurring randomly -Status: Feedback +Status: Open Type: Bug Package: *General Issues Operating System: CentOS 5.4 PHP Version: 5.3.2 Block user comment: N New Comment: The development snapshot provided has been in place for two weeks on one of our production servers and we have not seen these errors since. We are hesitant to put a development snapshot on all of our production machines however. Is there a release schedule for PHP 5.3.4, and will the changes that fixed this bug in the development snapshot be released with it? Previous Comments: ------------------------------------------------------------------------ [2010-09-13 20:06:18] darylp at qualtrics dot com We attempted downgrading one of our production webservers to PHP 5.2.14 3-4 weeks ago and haven't seen these errors since on that server. We continue to see the issue with our other webservers running PHP 5.3.2. I think that's a good indication that the problem stems from the version upgrade. We will be trying the latest version on one of our servers as suggested. ------------------------------------------------------------------------ [2010-09-11 18:04:02] fel...@php.net Please try using this snapshot: http://snaps.php.net/php5.3-latest.tar.gz For Windows: http://windows.php.net/snapshots/ ------------------------------------------------------------------------ [2010-06-22 23:27:26] darylp at qualtrics dot com Unfortunately, this issue is occurring only in our production environment and is occurring sporadically. It is happening in 2-5 minute bursts on a single server and across different functions. For most of the other 24 hours those scripts are running, there are no problems. We have not been able to correlate the times the error occurs with any events on our servers or traffic load. We will continue to attempt to reliably reproduce this issue and submit code when available. Are there any other suggestions on testing to be able to reproduce this? ------------------------------------------------------------------------ [2010-06-15 16:04:25] pierr...@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2010-06-15 02:01:26] darylp at qualtrics dot com Description: ------------ We have several servers running PHP 5.3.2 on CentOS 5.4 and a few on PHP 5.2.9 on FreeBSD. Reviewing our error logs, I have noticed a pattern of fatal errors: "Call to a member function * on a non-object". This occurs usually daily, and sometimes several times a day. When it occurs, it occurs on a single server, several times over a 2-3 minute span, and across different PHP sessions and occurs in different functions in different classes. This issue does not seem to coincide with high traffic or with time of day. This issue has occurred on each of the webservers running CentOS, although I have noticed it occurring over several releases of PHP. There are no other fatal PHP errors that occur concurrently, nor are there any other external processes that are occurring concurrently. The only thing I can suspect is PHP garbage collection improperly deleting objects, although debug_zval_dump() shows the object correctly constructed and never destructed prior to calling a member function. After seeing this error occur on several functions in various classes, I picked one and added code to check is_object() and email me the results of debug_zval_dump() when false. Although is_object() returns false, the dump of the object shows the following: if (!is_object($this->flow_info)) { debug_zval_dump($this); } output: object(SEFlow)#13 (10) refcount(5){ ... ["flow_info"]=> object(FlowInfo)#14 (4) refcount(1){ ... Calling a function: $this->flow_info->getElementsUnderBranch(__MAIN_BRANCH, false); results in the fatal error: Call to a member function getElementsUnderBranch() on a non-object in /var/www/Qualtrics/Qualtrics/SurveyEngine/Flow/Flow.php on line 186 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=52083&edit=1