Bug #71972 [NEW]: Cyclic references causing session_start(): Failed to decode session object.

From: b dot curtis at dfusion dot com Operating system: Ubuntu 14.04.4 LTS PHP version: 7.0.5 Package: Session related Bug Type: Bug Bug description:Cyclic references causing session_start(): Failed to decode session object. Description: ------------ Particular combination of session data causes "PHP Warning: session_start(): Failed to decode session object." Found in our web application but recreated in the test CLI script below. Steps to reproduce: 1) run this file once. Session data is saved. 2) Run again. Session cannot be decoded. 3) Remove session file /tmp/sess_sessiontest. If it wasn't already removed by the session_decode failing. 4) Comment out the $_SESSION['boogie'] line 5) Run again, and again and again and again.......No bug! Test script: --------------- <?php $session_id = 'sessiontest'; session_id($session_id); session_start(); $_SESSION['boogie'] = 1;//NOTE: Comment out this line for step 4 $_SESSION['obj1'] = new stdClass(); for ( $x=2; $x < 20; $x++) {//NOTE: In my tests the number needed varied but was always between 10 and 20 cyclic_ref($x); } function cyclic_ref($num) { $_SESSION['obj'.$num] = new stdClass(); $_SESSION['obj'.$num]->test = new stdClass();//NOTE: No bug if try commenting out this too. $_SESSION['obj'.$num]->obj1 = $_SESSION['obj1']; } Expected result: ---------------- When session successfully decoded no output. Actual result: -------------- #first run - success. Session written. $ php sessiontest.php #second run. Fail. Session cannot be decoded. ~$ php sessiontest.php PHP Warning: session_start(): Failed to decode session object. Session has been destroyed in /path/sessiontest.php on line 16 -- Edit bug report at https://bugs.php.net/bug.php?id=71972&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71972&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71972&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71972&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71972&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71972&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71972&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71972&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71972&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71972&r=support Expected behavior: https://bugs.php.net/fix.php?id=71972&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71972&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71972&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71972&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71972&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71972&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71972&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71972&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71972&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71972&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71972&r=mysqlcfg