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awslabs / aws-elasticache-cluster-client-memcached-for-php

Amazon ElastiCache Cluster Client is an enhanced PHP library to connect to ElastiCache clusters. This client library has been built upon libmemcached and is released under the Apache License.
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Segfault when using persistent connection on 5.6 #8

Open jamesrwhite opened 8 years ago

jamesrwhite commented 8 years ago

Hi,

We're seeing the elasticache extension segfault when we enable persistent connections using the $persistent_id param to Memcached::__construct(); as documented on http://php.net/manual/en/memcached.construct.php.

We're using PHP 5.6 on Ubuntu 14.04, via this ppa https://launchpad.net/~ondrej/+archive/ubuntu/php.

The actual message we see in /var/log/messages is:

Sep 14 13:07:15 some-internal-hostname.net kernel: [411876.710620] php-fpm5.6[7576]: segfault at 7f45bb79b358 ip 00007f45af326cb5 sp 00007ffc4cf92220 error 4 in amazon-elasticache-cluster-client.so[7f45af302000+52000]

Let me know if there's any additional info I can provide to help debug this.

Thanks!

QuChen88 commented 8 years ago

Interesting. I launched an instance with Ubuntu 14.04 and installed PHP5.5 and the cluster client. I did the following and it went fine.

php -a Interactive mode enabled

php > $m = new Memcached('persistence_pool'); php >

Are you still seeing this issue? I can try installing PHP 5.6 and try it out.

QuChen88 commented 8 years ago

Yes, worked for me on PHP 5.6 as well.

php -v PHP 5.6.23-1+deprecated+dontuse+deb.sury.org~trusty+1 (cli) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies

php -a Interactive mode enabled

php > $m = new Memcached(); php > $m = new Memcached('persistence_pool'); php >

jamesrwhite commented 8 years ago

Interesting. The only differences I can see is that I saw this issue via FPM, I didn't try from the CLI but I'll give that a go tomorrow. Also I think you're using a slightly different install source for PHP, perhaps the issue lies there? https://launchpad.net/~ondrej/+archive/ubuntu/php5-5.6 (yours) vs https://launchpad.net/~ondrej/+archive/ubuntu/php (mine).

jamesrwhite commented 8 years ago

I can't reproduce it via the cli, our exact version is:

PHP 5.6.27-1+deb.sury.org~trusty+1 (cli)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
    with Suhosin v0.9.38, Copyright (c) 2007-2015, by SektionEins GmbH