While debugging a segfault in a rather complex PHP application, I was able to reproduce the segfault with the following PHP code:
<?php
use Ds\Set;
class x {
private function __construct(private string $x) {}
public static function make(string $x): self { return new static($x); }
public function __toString(): string { return $this->x; }
}
$strings = ["z", "abcdefghijklmnopqrstuvwx"];
$set = (new Set($strings))->map(x::make(...));
var_dump($set);
echo $set->join(', ');
var_dump($set);
// var_dump($set->map(fn (x $s) => $s->__toString()));
// will throw zend_mm_heap corruptedThe problem was first observed on Debian Bookworm running PHP 8.2
The issue also exists using recent PHP 8.5 docker and the following wrapper script
#!/bin/sh
pecl install ds
docker-php-ext-enable ds
php test.php
called as docker run -it --rm -v "$PWD":/app -w /app php:cli ./test.sh
Output:
bject(Ds\Set)#5 (2) {
[0]=>
object(x)#3 (1) {
["x":"x":private]=>
string(1) "z"
}
[1]=>
object(x)#4 (1) {
["x":"x":private]=>
string(24) "abcdefghijklmnopqrstuvwx"
}
}
z, abcdefghijklmnopqrstuvwxobject(Ds\Set)#5 (2) {
[0]=>
object(x)#3 (1) {
["x":"x":private]=>
string(1) "z"
}
[1]=>
object(x)#4 (1) {
["x":"x":private]=>
string(139669686027048) "Segmentation fault (core dumped)
While debugging a segfault in a rather complex PHP application, I was able to reproduce the segfault with the following PHP code:
The problem was first observed on Debian Bookworm running PHP 8.2
The issue also exists using recent PHP 8.5 docker and the following wrapper script
#!/bin/sh pecl install ds docker-php-ext-enable ds php test.phpcalled as
docker run -it --rm -v "$PWD":/app -w /app php:cli ./test.shOutput: