Transfer closed for httpd parent and subrequest double bailout

Description

This can be recreated by setting memory_limit to 128MB and hitting virtual.php script that calls subrequest.php script

The following code:

<?php
// subrequest.php

$mep = str_repeat('test', 256 * 1000000);

echo count($mem);

<?php
// virtual.php

virtual('/subrequest.php');

echo "test";

$mep = str_repeat('test', 256 * 1000000);

echo "virtual!\n";

Resulted in this curl result:

* transfer closed with outstanding read data remaining
* Closing connection 0
curl: (18) transfer closed with outstanding read data remaining

The error logs showed following:

[Sat Jan 18 14:07:36.162766 2025] [php:error] [pid 86048:tid 86048] [client 127.0.0.1:48464] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted at /home/jakub/prog/php/81/Zend/zend_string.h:163 (tried to allocate 1024000032 bytes) in /home/jakub/prog/php/tests/apache2handler/basic/subrequest.php on line 3
[Sat Jan 18 14:07:36.162842 2025] [php:error] [pid 86048:tid 86048] [client 127.0.0.1:48464] PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted at /home/jakub/prog/php/81/Zend/zend_string.h:163 (tried to allocate 1024000032 bytes) in /home/jakub/prog/php/tests/apache2handler/basic/virtual.php on line 7
/home/jakub/prog/php/81/Zend/zend_alloc.c(393) : Bailed out without a bailout address!

But I expected normal output with 2 errors for allowed memory size

I tested this with 8.1 but it will be the same for supported version I'm sure - will double check later.

PHP Version

PHP 8.1+

Operating System

Ubuntu 20.04

Tái hiện lỗi bằng cách để virtual.php gọi subrequest.php với giới hạn bộ nhớ 128MB, sau đó kiểm tra các đường dẫn được báo cáo trong Zend/zend_string.h và Zend/zend_alloc.c. So sánh đầu ra truyền tải và đầu ra lỗi của Apache với hai lỗi giới hạn bộ nhớ dự kiến, không có lỗi bailout-address hoặc phản hồi bị cắt ngắn.