Segmentation fault (stack overflow) in Zend

[YuanchengJiang]

Description

The following code:

<?php
class Node
{
}
$firstNode = new Node();
$circularDoublyLinkedList = $firstNode;
for ($i = 0; $i < 200000; $i++) {
$currentNode = $circularDoublyLinkedList;
$nextNode = $circularDoublyLinkedList->next;
$newNode = new Node();
$currentNode->next = $newNode;
$newNode->next = $nextNode;
}

https://3v4l.org/BMkWi/rfc#vgit.master

For easy reproduce:

-d "memory_limit=1G"

PHP Version

PHP 8.4.0-dev

Operating System

ubuntu 22.04

[DanielEScherzer]

Its not really a doubly linked list, since there is only a single link from each node; without the dynamic property creation, minimal reproduction:

<?php
class Node {
    public $next;
}
$head = new Node();
for ($i = 0; $i < 200000; $i++) {
    $newNode = new Node();
    $newNode->next = $head->next;
    $head->next = $newNode;
}

[devnexen]

cc @arnaud-lb

[nielsdos]

This seems to me like a duplicate of the dtor stack overflow bug.

[iluuu1994]

Agreed, this looks like a duplicate of GH-15869.

Its not really a doubly linked list

These reports are generated from existing tests, so the variable names doesn't come from OP.