Unable to login to admin using PHP 7.0.0 and CM Redis Session about cm_redissession HOT 17 CLOSED

I have a similar issue on final PHP 7.0 whereas I can overcome your issue with the directions mentioned in http://www.code007.ro/making-work-magento-with-php-7-rc1
But after patching this I always get a 502 Bad Gateway through nginx.

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@craigcarnell I have tested saving sessions in database with PHP 7.0.0 and both: enabled and disabled Cm_RedisSession. The error is the same. According to my testing the error not related to Cm_RedisSession but rather to a bug with PHP 7.0.0.
@arosenhagen thanks for sharing the solution. It would be better to not rewriting the getData, setData, unsetData but having a fix for PHP but I cannot find any related open bug: https://bugs.php.net/search.php?cmd=display&search_for=session_regenerate_id&x=9&y=5.

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Yes just stumbled upon Inchoo/Inchoo_PHP7#4 which mentions a rather old bug from the RCs of PHP7 (https://bugs.php.net/bug.php?id=70520). This should indeed be a more "global" problem to either ZEND Framework or PHP7 itself.

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Hello all, I didn't had time to test Redis, but it seems that similar problem with Db session handler and php7 is that Mage_Core_Model_Resource_Session::read($sessId) was returning false when called on session_regenerate_id(true), since there is no session at that point, and just casting return to string fixed the problem. Php5 was ok with false, php7 isn't.

And I was getting similar error with db session handler:
session_regenerate_id(): Failed to create(read) session ID: user (path: )

Can maybe someone check if it's the same problem? Just make sure string is always returned at
https://github.com/colinmollenhour/Cm_RedisSession/blob/master/code/Model/Session.php#L387

Regards

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I have applied the fix that resulted from: Inchoo/Inchoo_PHP7#4
The mysql database issue is fixed with that.
But now I have the same 502 Bad Gateway' message that @arosenhagen had using the redis sessions. I have no idea where to start investigating that issue...

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I added the string casting, but in the normal case it should have already worked. The only case the string casting should matter is if the session data read was not able to be decoded for some reason..

Has anyone tried with no compression or with different compression algorithms?

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@colinmollenhour tested this also moments ago - the error is still there and it looks more like an issue with redis itself. now trying to test against very latest phpredis.

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What's the status of this thing?

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Based on 7.0.3 changelog it sounds like the session issues should be fixed. Anyone tested latest Cm_RedisSession with PHP 7.0.3?

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I tested this with 7.0.2 just today and the issues disappeared completely!

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@arosenhagen Saw that too, just waiting for it to be released. I might get around to compiling it

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@colinmollenhour Will test as soon as brew is updated to 7.0.3, hopefully soon

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just as a follow-up: we have RedisSessions running in production with 7.0.2 without hic-ups.

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I've been using 7.0.2 myself and have no had this issue. Thanks for the testing, everyone!

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Based on your comments above, I thought this issue should be resolved, but I am encountering it with the following server setup:

NGINX 1.10.1
PHP 7.0.12
Redis 3.2.4
Magento 1.9.2.4

I have also installed the PHP 7 extension from inchoo: https://github.com/Inchoo/Inchoo_PHP7

Here is the stacktrace:
Recoverable Error: session_regenerate_id(): Failed to create(read) session ID: memcache (path: tcp://127.0.0.1:11211?persistent=0&weight=2&timeout=60&retry_interval=10) in /home/dir/public_html/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php on line 492

0 [internal function]: mageCoreErrorHandler(4096, 'session_regener...', '/home/dir/p...', 492, Array)
1 /home/dir/public_html/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php(492): session_regenerate_id(true)
2 /home/dir/public_html/app/code/core/Mage/Core/Model/Session/Abstract.php(570): Mage_Core_Model_Session_Abstract_Varien->regenerateSessionId()
3 /home/dir/public_html/app/code/core/Mage/Admin/Model/Session.php(120): Mage_Core_Model_Session_Abstract->renewSession()
4 /home/dir/public_html/app/code/core/Mage/Admin/Model/Observer.php(77): Mage_Admin_Model_Session->login('user', 'password', Object(Mage_Core_Controller_Request_Http))
5 /home/dir/public_html/app/code/core/Mage/Core/Model/App.php(1358): Mage_Admin_Model_Observer->actionPreDispatchAdmin(Object(Varien_Event_Observer))
6 /home/dir/public_html/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Mage_Admin_Model_Observer), 'actionPreDispat...', Object(Varien_Event_Observer))
7 /home/dir/public_html/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
8 /home/dir/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(527): Mage::dispatchEvent('controller_acti...', Array)
9 /home/dir/public_html/app/code/core/Mage/Adminhtml/Controller/Action.php(160): Mage_Core_Controller_Varien_Action->preDispatch()
10 /home/dir/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(407): Mage_Adminhtml_Controller_Action->preDispatch()
11 /home/dir/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
12 /home/dir/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
13 /home/dir/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
14 /home/dir/public_html/app/Mage.php(683): Mage_Core_Model_App->run(Array)
15 /home/dir/public_html/index.php(82): Mage::run('domain_co', 'website')
16 {main}

Any ideas how to resolve this error? Thank you!

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Very first line shows that the error is related to memcache, not redis.

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Having this same problem on Magento Enterprise edition ... can't seem to find the corresponding 'read' function anywhere ...

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