Bug #68611 [Opn]: Segmentation fault with deep linked list

From: Date: Mon, 15 Dec 2014 14:13:44 +0000
Subject: Bug #68611 [Opn]: Segmentation fault with deep linked list
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-189073@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=68611&edit=1

 ID:                 68611
 Updated by:         derick@php.net
 Reported by:        reen at alphacomm dot nl
 Summary:            Segmentation fault with deep linked list
 Status:             Open
 Type:               Bug
 Package:            Reproducible crash
 Operating System:   Ubuntu
 PHP Version:        5.6.3
 Block user comment: N
 Private report:     N

 New Comment:

It looks like a stack overflow to me on shutdown:

...
...
#83762 0x0000000000a49b53 in _zval_dtor_func (zvalue=0x7ffff7f9d3d8, __zend_filename=0xfd99b8
"/home/derick/dev/php/php-src.git/Zend/zend_execute.h", __zend_lineno=81)
    at /home/derick/dev/php/php-src.git/Zend/zend_variables.c:54
#83763 0x0000000000a362be in _zval_dtor (zvalue=0x7ffff7f9d3d8, __zend_filename=0xfd99b8
"/home/derick/dev/php/php-src.git/Zend/zend_execute.h", __zend_lineno=81)
    at /home/derick/dev/php/php-src.git/Zend/zend_variables.h:35
#83764 0x0000000000a36385 in i_zval_ptr_dtor (zval_ptr=0x7ffff7f9d3d8, __zend_filename=0xfdba20
"/home/derick/dev/php/php-src.git/Zend/zend_variables.c", __zend_lineno=183)
    at /home/derick/dev/php/php-src.git/Zend/zend_execute.h:81
#83765 0x0000000000a375c6 in _zval_ptr_dtor (zval_ptr=0x7ffff7fa05c8, __zend_filename=0xfdba20
"/home/derick/dev/php/php-src.git/Zend/zend_variables.c", __zend_lineno=183)
    at /home/derick/dev/php/php-src.git/Zend/zend_execute_API.c:426
#83766 0x0000000000a49f5c in _zval_ptr_dtor_wrapper (zval_ptr=0x7ffff7fa05c8) at
/home/derick/dev/php/php-src.git/Zend/zend_variables.c:183
#83767 0x0000000000a5f63e in zend_hash_apply_deleter (ht=0x1565ee8 <executor_globals+360>,
p=0x7ffff7fa05b0) at /home/derick/dev/php/php-src.git/Zend/zend_hash.c:650
#83768 0x0000000000a5fcaf in zend_hash_reverse_apply (ht=0x1565ee8 <executor_globals+360>,
apply_func=0xa36c7e <zval_call_destructor>)
    at /home/derick/dev/php/php-src.git/Zend/zend_hash.c:804
#83769 0x0000000000a36d30 in shutdown_destructors () at
/home/derick/dev/php/php-src.git/Zend/zend_execute_API.c:217
#83770 0x0000000000a4c08b in zend_call_destructors () at
/home/derick/dev/php/php-src.git/Zend/zend.c:933
#83771 0x00000000009b9c35 in php_request_shutdown (dummy=0x0) at
/home/derick/dev/php/php-src.git/main/main.c:1750
#83772 0x0000000000afc046 in do_cli (argc=3, argv=0x1585130) at
/home/derick/dev/php/php-src.git/sapi/cli/php_cli.c:1177
#83773 0x0000000000afc73a in main (argc=3, argv=0x1585130) at
/home/derick/dev/php/php-src.git/sapi/cli/php_cli.c:1378


Previous Comments:
------------------------------------------------------------------------
[2014-12-15 14:11:41] derick@php.net

Note: this also happens without opcache and without xdebug

------------------------------------------------------------------------
[2014-12-15 13:16:13] reen at alphacomm dot nl

Description:
------------
Tested against:

PHP 5.6.3 (cli) (built: Nov 20 2014 10:45:50) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
with Xdebug v2.2.6, Copyright (c) 2002-2014, by Derick Rethans

AND

PHP 5.5.9-1ubuntu4.5 (cli) (built: Oct 29 2014 11:59:10) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies
    with Xdebug v2.2.3, Copyright (c) 2002-2013, by Derick Rethans

Test script:
---------------
<?php
class A {
    public $next;
}

$first = $a = new A();
for ($i = 0; $i < 100000; $i++) {
    $a = $a->next = new A();
}

echo 'Complete'.PHP_EOL;

Expected result:
----------------
Complete

Actual result:
--------------
Complete
Segmentation fault: 11



Complete
Segmentation fault (core dumped)


------------------------------------------------------------------------



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