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Bug #73390 Segmentation fault on clone sample code spread across multiple current versions
Submitted: 2016-10-26 10:28 UTC Modified: 2017-10-05 11:11 UTC
From: kenterfie at googlemail dot com Assigned:
Status: Duplicate Package: Reproducible crash
PHP Version: 5.x 7.x OS: Linux
Private report: No CVE-ID: None
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From: kenterfie at googlemail dot com
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 [2016-10-26 10:28 UTC] kenterfie at googlemail dot com
The following code sample is a 1:1 copy of one of your samples on It produce an segmentation fault. I was writing on a very similar subject, which also produce an segmentation fault, after some testing i found the page on and also this sample fail. I set the bug type to security because it is spread accross the most current php versions. I have tested 5.6.27 locally, but all other version also affected. Simple test is to use which end in an internal server error.

Test script:

class Foo
    var $that;

    function __clone()
        $this->that = clone $this->that;


$a = new Foo;
$b = new Foo;
$a->that = $b;
$b->that = $a;

$c = clone $a;
echo 'What happened?';

Expected result:
The normally expected result should be a successful created copy of an object.

Actual result:
Segmentation fault


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 [2016-10-26 10:29 UTC] kenterfie at googlemail dot com
-PHP Version: Irrelevant +PHP Version: 5.x 7.x
 [2016-10-26 10:29 UTC] kenterfie at googlemail dot com
Added more meaningful version information
 [2016-10-27 01:08 UTC]
-Status: Open +Status: Feedback -Type: Security +Type: Bug
 [2016-10-27 01:08 UTC]
Where on do you have this sample? It's certainly not a correct code, it leads to stack exhaustion via infinite recursion.
 [2016-10-27 01:09 UTC]
-Package: PHP Language Specification +Package: Reproducible crash
 [2016-10-27 02:03 UTC]
-Status: Feedback +Status: Open
 [2016-10-27 02:03 UTC]
It's a user comment from 8 years ago on the oop5.cloning page.

Obviously not a problem on our end. Do we add an editor's note? Remove the comment entirely?
 [2017-10-05 11:11 UTC]
-Status: Open +Status: Duplicate
 [2017-10-05 11:11 UTC]
Duplicate of #64196 regarding __clone() recursion stack overflow.

Given that the user note specifically wants to demonstrate this issue, I don't think there is anything actionable here.
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