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Author Topic: 2.0.14 session_start(): Failed to decode....  (Read 6023 times)

Offline NekoSensei

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2.0.14 session_start(): Failed to decode....
« on: May 31, 2017, 05:07:37 PM »
Hi all !
Since i updated to 2.0.14 i have any same error in my error log , it's not a probleme , i juste always need cleaning ...

Those errors come only, I think, from the aggressiveness of access of spams bots
Those errors never come from members of the forum.

Is there a way to stop seeing these errors?

Here are the errors:

Quote
https: / /...
2: session_start(): Failed to decode session object. Session has been destroyed
File: /home/lpdm/public_html/v3/Sources/Load.php
Line: 2574

Code: [Select]
2565: // Use cache setting sessions?
2566: if (empty($modSettings['databaseSession_enable']) && !empty($modSettings['cache_enable']) && php_sapi_name() != 'cli')
2567: {
2568: if (function_exists('mmcache_set_session_handlers'))
2569: mmcache_set_session_handlers();
2570: elseif (function_exists('eaccelerator_set_session_handlers'))
2571: eaccelerator_set_session_handlers();
2572: }
2573:
==>2574: session_start();
2575:
2576: // Change it so the cache settings are a little looser than default.
2577: if (!empty($modSettings['databaseSession_loose']))
2578: header('Cache-Control: private');
2579: }

Those IP from bots spam are not in error log, they come anytime and are banned ( in the admin Ban area )

I never see those error before, i use SMF 2 since december 2011

My other info :
Votre version du forum: SMF 2.0.14
Version courante de SMF: SMF 2.0.14
Version de GD: bundled (2.1.0 compatible)
Version MySQL: 10.0.30-MariaDB
Memcached: 1.4.4
XCache: 3.2.0
PHP: 5.6.30
Version du serveur: Apache



Thanks for all :)

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #1 on: June 01, 2017, 12:30:50 PM »
hi , what do I have to do to find out what it can be ?  :laugh:

Offline Colin

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #2 on: June 01, 2017, 01:25:54 PM »
Check your session.save_path in your PHP configuration file (php.ini). Did you just upgrade SMF or did you also do some PHP configuration changes?
"If everybody is thinking alike, then somebody is not thinking." - Gen. George S. Patton Jr.

Colin

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #3 on: June 01, 2017, 03:05:43 PM »
hi , thanks :)

session.save_path   : /tmp
only some phpmyadmin sessions are in this directory...

https://www.lepaysdumanga.fr/phpinfo2.php
( i will delete this file later )

I just upgrade 2.0.13 to 2.0.14 , nothing else
I tested this upgrade before in my computer with wamp :) ( but i haven't any spams bot in interne  ;D  )

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #4 on: June 01, 2017, 03:23:55 PM »
I checked my parametter in my forum , session are by the database , must i unactivate de session by database ?

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #5 on: June 02, 2017, 03:52:36 PM »
any news for me ? it's happen only with some russian spams bot

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #6 on: June 03, 2017, 07:16:15 PM »
Nothing is written anywhere in the sessions
I can just see the correspondence between the banned IP and the time of the error ...

In the picture you will see that there is no ip, no sessions ...?
I did not have these worries with 2.0.13

it's this IP for the moment : https://cleantalk.org/blacklists/178.127.187.13


Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #7 on: June 06, 2017, 03:08:47 PM »
Good evening, some news about this little problem? thank you :)

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #8 on: June 08, 2017, 02:40:14 PM »
I do not know if you have looked at this problem, but I have the impression that there is a bug with the list of banned IPs trying to access and sessions (I banned spam bots ), Can you control at this level?
I'll test the bans options, I'm using partial banning right now. (All checked in partial)
Thank you.

Offline Kindred

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #9 on: June 08, 2017, 04:45:13 PM »
Banning spammers, especially spambots, is a waste of time and system resources.
Please do not PM, IM or Email me with support questions.  You will get better and faster responses in the support boards.  Thank you.

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #10 on: June 08, 2017, 05:03:23 PM »
I have only 105 ip address ranges and all go well on my server, I add no more for several years.

The only problem I have is 2.0.14, I'm testing a change and would tell you what it's like tomorrow.
« Last Edit: June 08, 2017, 05:15:12 PM by NekoSensei »

Offline Colin

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #11 on: June 09, 2017, 11:45:17 AM »
Can you PM me forum admin, and SSH or ftp credentials. I'll take a look at this during the weekend.
"If everybody is thinking alike, then somebody is not thinking." - Gen. George S. Patton Jr.

Colin

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #12 on: June 09, 2017, 05:36:47 PM »
Done, thank you :)

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #13 on: July 11, 2017, 06:56:23 PM »
Any News In This Side ? :D
Can we hide this error? Because it bores me only visually...  :D

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #14 on: November 28, 2017, 08:59:26 PM »
Hello, this problem still exists with 2.0.15 ;)

Offline Colin

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #15 on: December 07, 2017, 02:27:15 AM »
"If everybody is thinking alike, then somebody is not thinking." - Gen. George S. Patton Jr.

Colin

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #16 on: December 07, 2017, 02:33:27 PM »
Hi colin , in this page it's for session.php , remove 2 lines on it which are :

Code: [Select]
function sessionDestroy($session_id)
{
global $smcFunc;

==> if (preg_match('~^[A-Za-z0-9,-]{16,32}$~', $session_id) == 0)
==> return false;
( https://github.com/SimpleMachines/SMF2.1/pull/4393/commits/c533c6b722fa187d70384322ff2083ec8de1afc7 )

then i try remove those same lines in load.php

I delete them now and I will see I continue to have these errors ;)
thanks

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #17 on: December 07, 2017, 05:58:11 PM »
bad news ! i still got the same error !

Code: [Select]
Aujourd'hui à 23:41
.../index.php?action=search2
2: session_start(): Failed to decode session object. Session has been destroyed
Fichier: .../Sources/Load.php
Ligne: 2575

Code: [Select]
2575 : session_start();

Online shawnb61

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #18 on: December 07, 2017, 10:13:20 PM »
I see in this other thread:
https://www.simplemachines.org/community/index.php?topic=554833.msg3933477#msg3933477

You were going to try renaming the cookie.  Another user reported that resolved the issue.

Have you done that?   Did the issue come back?
Address the process rather than the outcome.  Then, the outcome becomes more likely.   - Fripp

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #19 on: December 08, 2017, 05:12:43 AM »
Hello, no rename cookies do not change anything, in fact I noticed that most errors come from some spam servers, these servers go through paths that generate these errors when a guest does not have the right to go without a session (a real guest does not generate an error)

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #20 on: December 09, 2017, 11:58:48 AM »
Is it possible that these errors come from the fact that some spam robots block cookies?

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #21 on: December 09, 2017, 02:07:21 PM »
My initial thought is no.  My understanding is that when cookies are blocked php resorts to putting the session ID in the URL instead.  I don't think that would affect session contents. 

It is more likely that there is something unusual about sessions for bots under some circumstances. 

Could you find the lengths of your longest & shortest sessions?  You should be able to run these queries in the SQL window in phpMyAdmin:
Code: [Select]
SELECT LENGTH(data) AS maxlen FROM smf_sessions ORDER BY maxlen DESC LIMIT 1;
SELECT LENGTH(data) AS minlen FROM smf_sessions ORDER BY minlen ASC LIMIT 1;

Maybe something will stand out...  (My sessions range from ~80 bytes to ~4K bytes)
Address the process rather than the outcome.  Then, the outcome becomes more likely.   - Fripp

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #22 on: December 09, 2017, 03:09:51 PM »
For the moment with your 2 requests I get this:

maxlen
3622

minlen
82

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #23 on: December 09, 2017, 10:15:01 PM »
Thanks for sending me your session info.  It all looks good.  (I.e., the bad ones are getting destroyed just as the message says.)

Let me ponder this...  I may have something for you to test in a bit... 
Address the process rather than the outcome.  Then, the outcome becomes more likely.   - Fripp

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #24 on: December 23, 2017, 02:11:53 PM »
NekoSensei -
Are you still having this issue?   If so, I'll get you some code to test.
Sorry for leaving you hanging, a few things came up.
Address the process rather than the outcome.  Then, the outcome becomes more likely.   - Fripp

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #25 on: December 23, 2017, 03:33:36 PM »
hi shawnb61, yes it's always the same and I just cleaned fifty error messages from the same robot ... lol

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #26 on: December 30, 2017, 10:53:01 PM »
I have been working with NekoSensei offline on this.  What we have learned:
 - This activity was traced to a known malicious spammer
 - The session problems were caused by special UTF8 characters in the search field
 - The problems went away when NekoSensei rewrote the ban messages in English (all ISO-8859-1, no UTF8)

The true underlying problem is that searches for strings with multi-byte UTF8 characters cause session issues.  It appears the spammer was searching the site for his/her ban message (which is why the issues went away when NekoSensei changed the ban messages).   

However, you can still reproduce all the symptoms by searching for multi-byte strings.  A bug has been logged for this.   

Note that the search works fine; the message is logged in the background & the session is rebuilt in the background.  There is no user impact, just worrisome entries in the error log. 

Thanks to NekoSensei for being patient & providing all sorts of helpful info. 
Address the process rather than the outcome.  Then, the outcome becomes more likely.   - Fripp

Offline Arantor

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #27 on: December 31, 2017, 06:10:41 AM »
If the session table isn't UTF-8, all manner of stupid stuff could happen now sessions are done with JSON.
Don’t try to tell me that some power can corrupt a person. You haven’t had enough to know what it’s like.

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #28 on: December 31, 2017, 06:36:49 AM »
This even occurs if everything is UTF8.  And it's not the JSON encoding, not directly, anyway.  It has to do with the internal session_encode() not liking UTF8.  This error is on 2.0 & 2.1.  For more info, check out issue #4444 on Github.
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Offline albertlast

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #29 on: December 31, 2017, 06:45:28 AM »
Like i mention in #4444 the information are not enough to reproduce the error.
Would be nice to get a more detail guid to see the issue.

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #30 on: December 31, 2017, 07:28:51 AM »
Try changing the @ini_set('session.serialize_handler', 'php'); to @ini_set('session.serialize_handler', 'php_serialize');

Requires PHP 5.5.4
Don’t try to tell me that some power can corrupt a person. You haven’t had enough to know what it’s like.

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Offline Colin

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #31 on: December 31, 2017, 10:42:08 AM »
I have been working with NekoSensei offline on this.  What we have learned:
 - This activity was traced to a known malicious spammer
 - The session problems were caused by special UTF8 characters in the search field
 - The problems went away when NekoSensei rewrote the ban messages in English (all ISO-8859-1, no UTF8)

The true underlying problem is that searches for strings with multi-byte UTF8 characters cause session issues.  It appears the spammer was searching the site for his/her ban message (which is why the issues went away when NekoSensei changed the ban messages).   

However, you can still reproduce all the symptoms by searching for multi-byte strings.  A bug has been logged for this.   

Note that the search works fine; the message is logged in the background & the session is rebuilt in the background.  There is no user impact, just worrisome entries in the error log. 

Thanks to NekoSensei for being patient & providing all sorts of helpful info.



Thank you for identifying this.
"If everybody is thinking alike, then somebody is not thinking." - Gen. George S. Patton Jr.

Colin

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #32 on: December 31, 2017, 11:07:51 AM »
Try changing the @ini_set('session.serialize_handler', 'php'); to @ini_set('session.serialize_handler', 'php_serialize');

Requires PHP 5.5.4

Thanks, I'll put this suggestion in the issue log.
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Re: 2.0.14 session_start(): Failed to decode....
« Reply #33 on: January 04, 2018, 05:38:22 AM »
I am happy to have been able to help you, I am available for other additional tests.

I thank shawnb61 who took care of my strange case.

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #34 on: January 04, 2018, 09:49:30 AM »
You could change the code line like mention and
look if the error keeps.

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #35 on: January 04, 2018, 11:25:51 AM »
Hi albertlast,
Are you talking about this?
Try changing the @ini_set('session.serialize_handler', 'php'); to @ini_set('session.serialize_handler', 'php_serialize');

Requires PHP 5.5.4
Where do I find this line?

Offline Arantor

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #36 on: January 04, 2018, 11:58:02 AM »
Probably in Load.php (it's in Session.php in 2.1 but that file didn't exist in 2.0 and I don't know where it is offhand)

Note that you should probably clear the smf_sessions table after doing so.
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Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #37 on: January 04, 2018, 12:22:29 PM »
this line no exist in load.php in my 2.0.15 smf

I have these lines :
Code: [Select]
// Attempt to start the session, unless it already has been.
function loadSession()
{
global $HTTP_SESSION_VARS, $modSettings, $boardurl, $sc;

// Attempt to change a few PHP settings.
@ini_set('session.use_cookies', true);
@ini_set('session.use_only_cookies', false);
@ini_set('url_rewriter.tags', '');
@ini_set('session.use_trans_sid', false);
@ini_set('arg_separator.output', '&');

if (!empty($modSettings['globalCookies']))
{
$parsed_url = parse_url($boardurl);

if (preg_match('~^\d{1,3}(\.\d{1,3}){3}$~', $parsed_url['host']) == 0 && preg_match('~(?:[^\.]+\.)?([^\.]{2,}\..+)\z~i', $parsed_url['host'], $parts) == 1)
@ini_set('session.cookie_domain', '.' . $parts[1]);
}


Code: [Select]
// Use database sessions? (they don't work in 4.1.x!)
if (!empty($modSettings['databaseSession_enable']) && @version_compare(PHP_VERSION, '4.2.0') != -1)
{
session_set_save_handler('sessionOpen', 'sessionClose', 'sessionRead', 'sessionWrite', 'sessionDestroy', 'sessionGC');
@ini_set('session.gc_probability', '1');
}
elseif (@ini_get('session.gc_maxlifetime') <= 1440 && !empty($modSettings['databaseSession_lifetime']))
@ini_set('session.gc_maxlifetime', max($modSettings['databaseSession_lifetime'], 60));

Code: [Select]
// We want to be able to figure out any errors...
@ini_set('track_errors', '1');

But no @ini_set('session.serialize_handler', 'php');

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #38 on: January 04, 2018, 12:26:54 PM »
Put it before the ini_set for cookies.
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Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #39 on: January 04, 2018, 12:39:41 PM »
Like these ?

Code: [Select]
// Attempt to change a few PHP settings.
==> @ini_set('session.serialize_handler', 'php');
@ini_set('session.use_cookies', true);

Offline Arantor

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #40 on: January 04, 2018, 12:42:58 PM »
Well, yes, but you want the php_serialize version, that's the newer fixed version.
Don’t try to tell me that some power can corrupt a person. You haven’t had enough to know what it’s like.

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Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #41 on: January 04, 2018, 02:30:38 PM »
I emptied the table smf_sessions and applied like this

Code: [Select]
function loadSession()
{
global $HTTP_SESSION_VARS, $modSettings, $boardurl, $sc;

// Attempt to change a few PHP settings.
@ini_set('session.serialize_handler', 'php_serialize'); // le changement
@ini_set('session.use_cookies', true);
@ini_set('session.use_only_cookies', false);
@ini_set('url_rewriter.tags', '');
@ini_set('session.use_trans_sid', false);
@ini_set('arg_separator.output', '&amp;');


Wait and see  ;)

Offline Arantor

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #42 on: January 04, 2018, 02:37:21 PM »
Yup. Should find the problem is gone.
Don’t try to tell me that some power can corrupt a person. You haven’t had enough to know what it’s like.

No good deed goes unpunished / No act of charity goes unresented.

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #43 on: January 05, 2018, 05:35:39 AM »
For the moment no error, everything is going very well, we will see in 3 or 4 days, and if all goes well, we can say that it is definitely solved :)

Offline NekoSensei

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #44 on: January 09, 2018, 10:35:24 AM »
Hello everyone,
After a few days, and following the addition of the line in the loap.php, I am forced to find that everything works perfectly! Thanks again to shawnb61 and Arantor !
There is nothing more in my error page, just password errors of the usual members ...

Now all you have to do is add this line to a possible next patch 2.0.16 ;)

See you :D

Offline FishingManMatt

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Re: 2.0.14 session_start(): Failed to decode....
« Reply #45 on: October 14, 2018, 03:47:30 PM »
Thanks for the info.
I've recently switched to PHP 7 and noticed exactly the same entries i my error log.
Although, I'm not sure if this is related to the new PHP. It's possible they were also on my old 5.6 version but they didn't get my attention.
I will try to add the suggested code to my Load.php file.