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Bug #52720 User Session handler Crash [FPM and APC]
Submitted: 2010-08-28 09:47 UTC Modified: 2013-02-18 00:34 UTC
Avg. Score:4.0 ± 1.0
Reproduced:3 of 3 (100.0%)
Same Version:2 (66.7%)
Same OS:1 (33.3%)
From: mat999 at gmail dot com Assigned:
Status: No Feedback Package: Session related
PHP Version: 5.3.3 OS: Debian Lenny Linux
Private report: No CVE-ID: None
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 [2010-08-28 09:47 UTC] mat999 at gmail dot com
Registering a user session handler crashes the system.

php 5.3.3-fpm (from dotdeb repo)
APC extension

Test script:
class Session
        public static function Init(){
            ini_set('session.save_handler', 'user');

            session_set_save_handler(array('Session', 'open'),
            array('Session', 'close'),
            array('Session', 'read'),
            array('Session', 'write'),
            array('Session', 'destroy'),
            array('Session', 'gc')
        public static function open() {
            return true;
        public static function close() {
            return true;
        public static function read($id) {
            return '';
            //return apc_exists('ns_'.$id)?(string)apc_fetch('ns_'.$id):'';
        public static function write($id, $data) {
            //return apc_store('ns_'.$id,$data,1200);
        public static function destroy($id) {
            return true;
        public static function gc($max) {
            return true;

Expected result:
Session registration

Actual result:
Crash, if someone gives me details on how to valgrind php-fpm ill post a backtrace, ive failed to do so.


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 [2010-08-28 12:19 UTC]
-Status: Open +Status: Feedback
 [2010-08-28 12:19 UTC]
Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read for *NIX and for Win32

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

A backtrace would help already, see the instructions on
 [2010-08-28 16:30 UTC] mat999 at gmail dot com
-Status: Feedback +Status: Open
 [2010-08-28 16:30 UTC] mat999 at gmail dot com
its not that easy for php-fpm, and this is php-fpm specific.
 [2010-08-28 16:40 UTC]
Just attach gdb to a runnning php-fpm process.

gdb /usr/bin/php-fpm 1234

where 1234 is the process id.  Then hit 'c' for continue in gdb and hit port 80 
until you hit the process you attached to.
 [2010-08-28 16:42 UTC] mat999 at gmail dot com
ive tried that but it doesnt propagate to child processes and php-fpm is multy threaded.
 [2010-08-28 16:43 UTC]
No it isn't.
 [2010-08-28 16:45 UTC] mat999 at gmail dot com
ummm? Yes it is.

        |                 |-php5-fpm(22058,www-data)
        |                 |-php5-fpm(22305,vu2001)
        |                 |-php5-fpm(22307,vu2001)
        |                 |-php5-fpm(22308,vu2001)
        |                 |-php5-fpm(22311,vu2001)
        |                 |-php5-fpm(22313,vu2001)
        |                 |-php5-fpm(22315,vu2001)
        |                 |-php5-fpm(22317,vu2001)
        |                 |-php5-fpm(22318,vu2001)
        |                 |-php5-fpm(22319,vu2001)
        |                 |-php5-fpm(22326,vu2001)
        |                 |-php5-fpm(22327,vu2001)
        |                 |-php5-fpm(22328,vu2001)
        |                 |-php5-fpm(22330,vu2001)
        |                 |-php5-fpm(22354,vu2009)
        |                 |-php5-fpm(22356,vu2009)
        |                 |-php5-fpm(22362,vu2009)
        |                 `-php5-fpm(22381,vu2009)
 [2010-08-28 16:48 UTC]
Those are processes, not threads.  There is a root-owned master process that 
preforks multiple child processes to handle requests.  Simple set that to a low 
number in your config file and attach gdb to one of the children.  It's easy.
 [2010-08-28 16:53 UTC] mat999 at gmail dot com
Ok then, dont get precise.

Ill have to setup a dev install then on my local PC since I cant do this on my production server. Ill be away tomorow/today (its 1am) so Ill have to do it on monday unless someone test the above code on php-fpm before then.
 [2010-08-29 14:34 UTC]
-Status: Open +Status: Feedback
 [2010-08-29 14:34 UTC]
I'd also suggest using our sources. We have no control over patches by dotdeb developers and don't know them
 [2013-02-18 00:34 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
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