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[2003-07-13 12:53 UTC] eric at cosky dot com
Description:
------------
The following block of code will crash the PHP I installed from php5-win32-200307130630.zip (and previous versions).
I've read that I should be using '&new' to gain proper use of destructors, but it seems reasonable to say that using 'new' shouldn't cause a server crash. Perhaps a useful thing to do would be to have a class that has a __destruct() function produce an error if created without '&new'?
Reproduce code:
---------------
class SiteClass {
function __construct() { $this->page = new PageClass(); }
}
class PageClass {
function Display() {
$section = new SectionClass("PageClass::Display");
}
}
class SectionClass {
function __construct($comment) {
$this->Comment = $comment;
}
function __destruct() {
out($this->Comment); // this line doesn't crash PHP
out("\n<!-- End Section: " . $this->Comment . "-->"); // this line crashes PHP
}
}
function out($code) { return; }
$site = new SiteClass();
$site->page->Display();
Expected result:
----------------
Nothing.
Actual result:
--------------
System alert for PHP crashing.
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Last updated: Fri Dec 05 07:00:01 2025 UTC |
Verified, backtrace as follows: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 1024 (runnable)] _efree (ptr=0x6f697463) at /usr/src/web/php/php5/Zend/zend_alloc.c:257 257 CALCULATE_REAL_SIZE_AND_CACHE_INDEX(p->size); (gdb) bt #0 _efree (ptr=0x6f697463) at /usr/src/web/php/php5/Zend/zend_alloc.c:257 #1 0x813e01b in _zval_ptr_dtor (zval_ptr=0x4029afc0) at /usr/src/web/php/php5/Zend/zend_execute.h:67 #2 0x814b075 in zend_hash_clean (ht=0x4029adbc) at /usr/src/web/php/php5/Zend/zend_hash.c:535 #3 0x816bb91 in zend_do_fcall_common_helper (execute_data=0xbfffd53c, op_array=0x4029839c) at /usr/src/web/php/php5/Zend/zend_execute.c:2673 #4 0x816bd80 in zend_do_fcall_by_name_handler (execute_data=0xbfffd53c, op_array=0x4029839c) at /usr/src/web/php/php5/Zend/zend_execute.c:2725 #5 0x815c2c4 in execute (op_array=0x4029839c) at /usr/src/web/php/php5/Zend/zend_execute.c:1194 #6 0x8146b20 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/src/web/php/php5/Zend/zend.c:1017 #7 0x811b8d3 in php_execute_script (primary_file=0xbffff898) at /usr/src/web/php/php5/main/main.c:1695 #8 0x8175503 in main (argc=2, argv=0xbffff904) at /usr/src/web/php/php5/sapi/cgi/cgi_main.c:1560 #9 0x401b19cb in __libc_start_main (main=0x8174c80 <main>, argc=2, argv=0xbffff904, init=0x806985c <_init>, fini=0x8175c14 <_fini>, rtld_fini=0x4000aea0 <_dl_fini>, stack_end=0xbffff8fc) at ../sysdeps/generic/libc-start.c:92