#35156 [NEW]: Calling ob_flush after creating an ob callback causes "Segmentation fault"

From: php at kloopy dot com Operating system: Win32 and Linux PHP version: 4.4.1 PHP Bug Type: Output Control Bug description: Calling ob_flush after creating an ob callback causes "Segmentation fault" Description: ------------ When setting an output buffer that returns an empty string (I do have a good reason for doing this), later calls to ob_flush() cause PHP to seg fault. Tested on PHP-4.1.1 on linux (CLI and Apache2 module) with same error on both. Also tested on PHP-5.0.5 on Win32 (CLI and Apache2 module) with same error on both. Reproduce code: --------------- <?php function nooutput($text) { return ""; } print "Before\n"; ob_start("nooutput"); print "Middle\n"; ob_flush(); ob_end_flush(); print "After\n"; ?> Expected result: ---------------- Before After Actual result: -------------- Before Segmentation fault -- Edit bug report at http://bugs.php.net/?id=35156&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=35156&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=35156&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=35156&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=35156&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=35156&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=35156&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=35156&r=needscript Try newer version: http://bugs.php.net/fix.php?id=35156&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=35156&r=support Expected behavior: http://bugs.php.net/fix.php?id=35156&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=35156&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=35156&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=35156&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35156&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=35156&r=dst IIS Stability: http://bugs.php.net/fix.php?id=35156&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=35156&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=35156&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=35156&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=35156&r=mysqlcfg