Timer leaks on pcntl_fork in ZTS build

Description

The following code:

<?php
pcntl_fork();

Resulted in this output (in child process):

=================================================================
==58097==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 8 byte(s) in 1 object(s) allocated from:
    #0 0xffffa37f943b in malloc (/usr/lib/aarch64-linux-gnu/libasan.so.5+0xcf43b)
    #1 0xffffa3622aaf in timer_create ../sysdeps/unix/sysv/linux/timer_create.c:59
    #2 0xaaaacd663a6b in zend_max_execution_timer_init /usr/local/src/php/Zend/zend_max_execution_timer.c:46
    #3 0xaaaacd2913c7 in init_executor /usr/local/src/php/Zend/zend_execute_API.c:202
    #4 0xaaaacd2e3497 in zend_activate /usr/local/src/php/Zend/zend.c:1257
    #5 0xaaaacd0b09c3 in php_request_startup /usr/local/src/php/main/main.c:1758
    #6 0xaaaacd7b92db in do_cli /usr/local/src/php/sapi/cli/php_cli.c:934
    #7 0xaaaacd7bbd57 in main /usr/local/src/php/sapi/cli/php_cli.c:1340
    #8 0xffffa08c7da3 in __libc_start_main ../csu/libc-start.c:308
    #9 0xaaaacbea50f3  (/opt/php/debug-zts-asan/bin/php+0x5b50f3)

There's an explicit comment that this shouldn't be freed after a fork:

void zend_max_execution_timer_shutdown(void) /* {{{ */
{
	/* Don't try to delete a timer created before a call to fork() */
	if (EG(pid) != getpid()) {
		return;
	}

So paging @dunglas who wrote that comment.

PHP Version

PHP 8.3

Operating System

No response

AddressSanitizer 上で pcntl_fork を使用して PHP 8.3 ZTS のケースを再現し、その後、レポートに示されている初期化およびシャットダウンのパスと併せて zend_max_execution_timer.c を読みます。子プロセスのリークトレースを基準として使用します。親プロセスのタイマー処理を後退させることなく、reproducer がリークしたタイマーを報告しなくなれば完了です。