zend_mm_heap corrupted on centos guest

[Danack]

Repo script is below. It's basically example 2 with an extra host name inserted.

The environment is Centos 6.4 with self-built version of PHP 5.6.2. It is sitting inside a vagrant box hosted on Mac OSX .

The hostname is being resolved by a hosts file on the host, not the guest. I'm going to attempt to capture the packets being sent between guest/host.

The output is

# php 002_async.php 
github.com => 192.30.252.131
google.com => 62.24.157.49
FAILED: imagick.test
stackoverflow.com => 198.252.206.140
localhost => 127.0.0.1
192.168.0.1 => 192.168.0.1
::1 => ::1
zend_mm_heap corrupted

<?php

require __DIR__ . '/../vendor/autoload.php';

Amp\run(function() {
    $names = [
        'github.com',
        'google.com',
        'imagick.test', // this is the extra domain
        'stackoverflow.com',
        'localhost',
        '192.168.0.1',
        '::1',
    ];

    $promises = [];
    $resolver = new Amp\Dns\Resolver;
    foreach ($names as $name) {
        $promise = $resolver->resolve($name);
        $promises[$name] = $promise;
    }

    // Combine our multiple promises into a single promise
    $comboPromise = Amp\some($promises);

    // Yield control until the combo promise resolves
    list($errors, $successes) = (yield $comboPromise);

    foreach ($names as $name) {
        echo isset($errors[$name]) ? "FAILED: {$name}\n" : "{$name} => {$successes[$name][0]}\n";
    }

    // Stop the event loop so we don't sit around forever
    Amp\stop();
});

[Danack]

Ok, so the fact that the lookup failing is pretty obvious now that it's morning. Amphp/dns doesn't read the /etc/resolve file which in the guest looks like:

; generated by /sbin/dhclient-script
nameserver 10.0.2.3

10.0.2.3 is the host. As the entry is in the hosts file on the host, and Amphp/dns uses 8.8.8.8 to do the dns lookup, it obviously fails.

I'm going to keep trying to track the segfault/mem corruption, as it seems to be a real thing.

[kelunik]

Support for /etc/resolv.conf is now merged.