Serialization segmentation fault when serializing references

[ssigwart]

Description

The following code causes a segmentation fault.

<?php

class TestA
{
	public TestB $b;
	public function __serialize(): array
	{
		return [serialize($this->b)];
	}
	public function __unserialize(array $data): void
	{
		$this->b = unserialize($data[0]);
	}
}
class TestB
{
	public TestA $a;
}
$a = new TestA();
$b = new TestB();
$a->b = $b;
$b->a = $a;
echo serialize($a);

This probably isn't code people would actually use, but I was trying to debug a related unserializing bug and came across this.

PHP Version

PHP 8.0.30; PHP 8.2.11

Operating System

No response

[nielsdos]

I can reproduce the segfault on 8.1-8.2.
You have infinite recursion, so I don't think this is actually a bug?
Noteworthy: on 8.3 this would cause an error exception instead: Uncaught Error: Maximum call stack size of 8306688 bytes reached. Infinite recursion?.

[ssigwart]

Yeah, it's not code anyone should probably use. Like I said in the original issue, I was trying to simplify a different serialization bug I was seeing and stumbled across this, so I thought I'd report it. Since PHP 8.3 causes an exception instead, it probably makes sense to just close this.

Thanks for the quick response.