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Bug #62849 cache error while using static class callback as session handler
Submitted: 2012-08-18 03:17 UTC Modified: 2016-11-18 21:24 UTC
From: sskaje at gmail dot com Assigned:
Status: Wont fix Package: APC (PECL)
PHP Version: 5.4.6 OS: CentOS 6.3
Private report: No CVE-ID: None
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 [2012-08-18 03:17 UTC] sskaje at gmail dot com
Description:
------------
I tried to create a minimum code to reproduce a crash caused on php 5.4.6 + apc 3.1.12, but only got a warning at last.

Code can be found here: http://pastebin.com/0m08CNBR

I start the built-in web server: php  -S 0.0.0.0:8080 -c /usr/local/etc/php.ini

APC config in PHP.ini:
[apc]
extension=apc.so
apc.enabled = 1
apc.shm_segments = 1
apc.shm_size = 64M
apc.optimization = 1
apc.num_files_hint = 0
apc.ttl = 0
apc.gc_ttl = 3600
apc.cache_by_default = on


then i tried to visit that test script via browser: http://172.16.9.217:8080/test/index.php

Warning given by the built-in web server:

[root@localhost main]# php  -S 0.0.0.0:8080 -c /usr/local/etc/php.ini
PHP 5.4.6 Development Server started at Sat Aug 18 11:06:12 2012
Listening on http://0.0.0.0:8080
Document root is /usr/local/nginx/html/lehecai/control/main
Press Ctrl-C to quit.
[Sat Aug 18 11:06:16 2012] 172.16.6.100:65228 [200]: /test/index.php
[Sat Aug 18 11:06:17 2012] 172.16.6.100:65229 [200]: /test/index.php
[Sat Aug 18 11:06:17 2012] PHP Warning:  Invalid callback mySessionHandlerS::write, class 'mySessionHandlerS' not found in Unknown on line 0
[Sat Aug 18 11:06:17 2012] PHP Warning:  Unknown: Failed to write session data (user). Please verify that the current setting of session.save_path is correct () in Unknown on line 0
[Sat Aug 18 11:06:17 2012] PHP Warning:  Invalid callback mySessionHandlerS::close, class 'mySessionHandlerS' not found in Unknown on line 0
[Sat Aug 18 11:06:23 2012] 172.16.6.100:65230 [200]: /test/index.php
[Sat Aug 18 11:06:23 2012] PHP Warning:  Invalid callback mySessionHandlerS::write, class 'mySessionHandlerS' not found in Unknown on line 0
[Sat Aug 18 11:06:23 2012] PHP Warning:  Unknown: Failed to write session data (user). Please verify that the current setting of session.save_path is correct () in Unknown on line 0
[Sat Aug 18 11:06:23 2012] PHP Warning:  Invalid callback mySessionHandlerS::close, class 'mySessionHandlerS' not found in Unknown on line 0


You can see it works at the first time, then failure unless terminate and start a new server.

====================================================

What's more, i tried to get some dump of the crash i said above both under php-fpm and the built-in server.

bt info here: http://pastebin.com/b4pbjKra

Code reproducing this crash can't be given at this time, i'll try to update this issue.

Test script:
---------------
http://pastebin.com/0m08CNBR


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 [2012-08-18 03:21 UTC] sskaje at gmail dot com
The code in http://pastebin.com/0m08CNBR offered two different call to session_set_save_handler.

The commented one works well.
 [2012-08-18 03:55 UTC] rasmus@php.net
You realize that there is a session handler interface you can implement in PHP 
5.4 now, right? 

See: http://php.net/manual/en/class.sessionhandlerinterface.php

Not that we shouldn't fix this case in APC, but you don't need to write code like 
that anymore unless you need to be backward compatible with older versions.
 [2012-08-18 07:11 UTC] sskaje at gmail dot com
@rasmus yes i notice that before i figured out what caused the warning/crash directly.
And the best solution might be 
            if (function_exists('session_register_shutdown')) {
                session_register_shutdown();
            } else {
                register_shutdown_function('session_write_close');
            }
coz i want my code runnable under both 5.3 and 5.4 without too much modification.


What's more, 5.4 accepts the old style parameters as it accepted, but it warns/crashes only if i have apc loaded, without any literal error. So in my opinion this case should be fixed, maybe not now.

Thanks for your reply.
 [2016-11-18 21:24 UTC] kalle@php.net
-Status: Open +Status: Wont fix
 [2016-11-18 21:24 UTC] kalle@php.net
APC is no longer supported in favor of opcache that comes bundled with PHP, if you wish to use the user cache, then look at PECL/APCu.
 
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