Bug #70631 [Opn->Csd]: Another Segfault in gc_remove_from_buffer()

Edit report at https://bugs.php.net/bug.php?id=70631&edit=1 ID: 70631 Updated by: laruence@php.net Reported by: laruence@php.net Summary: Another Segfault in gc_remove_from_buffer() -Status: Open +Status: Closed Type: Bug Package: *General Issues Operating System: all PHP Version: 5.6.14 Block user comment: N Private report: N New Comment: Automatic comment on behalf of laruence@gmail.com Revision: http://git.php.net/?p=php-src.git;a=commit;h=4744eec753786e18b28887463bdcb3f1e91efb60 Log: Fixed bug #70631 (Another Segfault in gc_remove_from_buffer()) Previous Comments: ------------------------------------------------------------------------ [2015-10-04 02:56:17] laruence@php.net Description: ------------ this bug only can be triggered with concurrent requests. like using ab -n 1000 -c 50 Test script: --------------- <?php function x($x = array(1)) {} $func = new ReflectionFunction('x'); $params = $func->getParameters(); echo $params[0]->getDefaultValue(); ?> Expected result: ---------------- none segfault Actual result: -------------- segfault Program terminated with signal SIGSEGV, Segmentation fault. #0 0x000000000091a4a7 in gc_remove_from_buffer (root=0x7f7b2f69e5e8) at /home/huixinchen/opensource/php-5.6/Zend/zend_gc.h:189 189 root->next->prev = root->prev; (gdb) bt #0 0x000000000091a4a7 in gc_remove_from_buffer (root=0x7f7b2f69e5e8) at /home/huixinchen/opensource/php-5.6/Zend/zend_gc.h:189 #1 0x000000000091acc3 in gc_remove_zval_from_buffer (zv=0x7f7b2f69e630) at /home/huixinchen/opensource/php-5.6/Zend/zend_gc.c:260 #2 0x00000000008d744a in i_zval_ptr_dtor (zval_ptr=0x7f7b2f69e630, __zend_filename=0xdcd070 "/home/huixinchen/opensource/php-5.6/Zend/zend_variables.c", __zend_lineno=188) at /home/huixinchen/opensource/php-5.6/Zend/zend_execute.h:78 #3 0x00000000008d86c5 in _zval_ptr_dtor (zval_ptr=0x7f7b3644b590, __zend_filename=0xdcd070 "/home/huixinchen/opensource/php-5.6/Zend/zend_variables.c", __zend_lineno=188) at /home/huixinchen/opensource/php-5.6/Zend/zend_execute_API.c:424 #4 0x00000000008ec15a in _zval_ptr_dtor_wrapper (zval_ptr=0x7f7b3644b590) at /home/huixinchen/opensource/php-5.6/Zend/zend_variables.c:188 #5 0x0000000000901823 in zend_hash_destroy (ht=0x7f7b3644b440) at /home/huixinchen/opensource/php-5.6/Zend/zend_hash.c:548 #6 0x00000000008ebcf9 in _zval_dtor_func (zvalue=0x7f7b3644b3c8, __zend_filename=0xdd1ab8 "/home/huixinchen/opensource/php-5.6/Zend/zend_execute.h", __zend_lineno=95) at /home/huixinchen/opensource/php-5.6/Zend/zend_variables.c:45 #7 0x000000000092e9c6 in _zval_dtor (zvalue=0x7f7b3644b3c8, __zend_filename=0xdd1ab8 "/home/huixinchen/opensource/php-5.6/Zend/zend_execute.h", __zend_lineno=95) at /home/huixinchen/opensource/php-5.6/Zend/zend_variables.h:35 #8 0x000000000092eb66 in i_zval_ptr_dtor_nogc (zval_ptr=0x7f7b3644b3c8, __zend_filename=0xdd2130 "/home/huixinchen/opensource/php-5.6/Zend/zend_vm_execute.h", __zend_lineno=13044) at /home/huixinchen/opensource/php-5.6/Zend/zend_execute.h:95 #9 0x0000000000950397 in ZEND_ECHO_SPEC_VAR_HANDLER (execute_data=0x7f7b36419ca8) at /home/huixinchen/opensource/php-5.6/Zend/zend_vm_execute.h:13044 #10 0x00000000009342b2 in execute_ex (execute_data=0x7f7b36419ca8) at /home/huixinchen/opensource/php-5.6/Zend/zend_vm_execute.h:363 #11 0x000000000093433b in zend_execute (op_array=0x7f7b3644a910) at /home/huixinchen/opensource/php-5.6/Zend/zend_vm_execute.h:388 #12 0x00000000008ef790 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/huixinchen/opensource/php-5.6/Zend/zend.c:1341 #13 0x000000000085596f in php_execute_script (primary_file=0x7fff762650b0) at /home/huixinchen/opensource/php-5.6/main/main.c:2597 #14 0x00000000009b0b60 in main (argc=1, argv=0x7fff76267418) at /home/huixinchen/opensource/php-5.6/sapi/fpm/fpm/fpm_main.c:1964 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70631&edit=1