Bug #67319 [Opn->Nab]: Error with an infinite recursion in __toString().

Edit report at https://bugs.php.net/bug.php?id=67319&edit=1 ID: 67319 Updated by: johannes@php.net Reported by: Sysaninster at gmail dot com Summary: Error with an infinite recursion in __toString(). -Status: Open +Status: Not a bug Type: Bug Package: *General Issues Operating System: centos 6.5 PHP Version: 5.5.12 Block user comment: N Private report: N New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php This is a stack overflow we can't detect in a good way. Only thin would be an arbitrary limit, which might be too low for some valid use cases on one machine but might be too high on a different machine. Be careful with recursion. Previous Comments: ------------------------------------------------------------------------ [2014-05-21 14:57:11] Sysaninster at gmail dot com Description: ------------ Error with an infinite recursion in __toString(). I get in CLI: Segmentation fault When I try execute this code in php-fpm, then I get an error in fpm log: [21-May-2014 16:41:48] WARNING: [pool logic] child 8686 exited on signal 11 (SIGSEGV) after 957.896252 seconds from start Test script: --------------- class foo { public $parent = null; public function __toString() { return sprintf('some %s', $this->public); } } $test = new \foo(); $test->public = $test; echo $test; Expected result: ---------------- Fatal error: Maximum function nesting level of '500' reached, aborting! in /home /sysanin/test.php on line 5 Call Stack: 0.0002 118064 1. {main}() /home/sysanin/test.php:0 0.0003 118372 2. foo->__toString() /home/sysanin/test.php:12 0.0003 118428 3. sprintf() /home/sysanin/test.php:6 0.0003 118720 4. foo->__toString() /home/sysanin/test.php:6 0.0003 118776 5. sprintf() /home/sysanin/test.php:6 0.0003 119068 6. foo->__toString() /home/sysanin/test.php:6 0.0003 119136 7. sprintf() /home/sysanin/test.php:6 0.0003 119428 8. foo->__toString() /home/sysanin/test.php:6 ... 0.0015 203708 493. sprintf() /home/sysanin/test.php:6 0.0015 204000 494. foo->__toString() /home/sysanin/test.php:6 0.0015 204056 495. sprintf() /home/sysanin/test.php:6 0.0015 204348 496. foo->__toString() /home/sysanin/test.php:6 0.0015 204404 497. sprintf() /home/sysanin/test.php:6 0.0015 204696 498. foo->__toString() /home/sysanin/test.php:6 0.0015 204752 499. sprintf() /home/sysanin/test.php:6 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=67319&edit=1