#47341 [NEW]: Calling gc_collect_cycles() with zend.enable_gc=0 causes segfault

From: geoffers+phpbugs at gmail dot com Operating system: Debian Etch PHP version: 5.2CVS-2009-02-08 (CVS) PHP Bug Type: Reproducible crash Bug description: Calling gc_collect_cycles() with zend.enable_gc=0 causes segfault Description: ------------ When running PHP with zend.enable_gc=0, a segfault occurs when trying to call gc_collect_cycles(). This is on Debian Etch, with everything apart from PHP 5.3 from the Debian stable repositories. PHP 5.3 was compiled with: './configure' '--enable-bcmath' '--enable-calendar' '--with-zlib- dir=/usr' '--with-gd' '--with-apxs2=/usr/bin/apxs2' '--with-curl=/usr' '--without-pear' '--enable-mbstring' '--enable-debug' I have only tested through the CLI using -d zend.enable_gc=0. Reproduce code: --------------- <?php gc_collect_cycles(); ?> Expected result: ---------------- I would expect that PHP didn't crash! Beyond that, I'd expect the result to be the same as the following when zend.enable_gc=1: <?php gc_disable(); gc_collect_cycles(); ?> which is to say that it silently fails (and returns 0). Actual result: -------------- Segfault: #0 0x08449a83 in gc_mark_roots () at /root/php5/Zend/zend_gc.c:363 #1 0x0844a05e in gc_collect_cycles () at /root/php5/Zend/zend_gc.c:539 #2 0x08439ab6 in zif_gc_collect_cycles (ht=0, return_value=0xb79301ac, return_value_ptr=0x0, this_ptr=0x0, return_value_used=0) at /root/php5/Zend/zend_builtin_functions.c:336 #3 0x084536a5 in zend_do_fcall_common_helper_SPEC (execute_data=0xb77b8048) at /root/php5/Zend/zend_vm_execute.h:313 #4 0x084581ea in ZEND_DO_FCALL_SPEC_CONST_HANDLER (execute_data=0xb77b8048) at /root/php5/Zend/zend_vm_execute.h:1564 #5 0x08452ae2 in execute (op_array=0xb79307d8) at /root/php5/Zend/zend_vm_execute.h:104 #6 0x084286de in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /root/php5/Zend/zend.c:1181 #7 0x083bce0c in php_execute_script (primary_file=0xbfb8bce4) at /root/php5/main/main.c:2147 #8 0x084b8e4b in main (argc=4, argv=0xbfb8be34) at /root/php5/sapi/cli/php_cli.c:1159 -- Edit bug report at http://bugs.php.net/?id=47341&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=47341&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=47341&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=47341&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=47341&r=fixedcvs Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=47341&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=47341&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=47341&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=47341&r=needscript Try newer version: http://bugs.php.net/fix.php?id=47341&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=47341&r=support Expected behavior: http://bugs.php.net/fix.php?id=47341&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=47341&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=47341&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=47341&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47341&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=47341&r=dst IIS Stability: http://bugs.php.net/fix.php?id=47341&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=47341&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=47341&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=47341&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=47341&r=mysqlcfg