PHP :: Bug #31984 :: sessions fail randomly, causes a segmentation fault in apache

Bug #31984

sessions fail randomly, causes a segmentation fault in apache

Submitted:

2005-02-15 13:44 UTC

Modified:

2005-07-18 01:00 UTC

Votes:	17
Avg. Score:	4.5 ± 0.8
Reproduced:	15 of 16 (93.8%)
Same Version:	7 (46.7%)
Same OS:	5 (33.3%)

From:

root at mediamonks dot net

Assigned:

sniper (profile)

Status:

No Feedback

Package:

Session related

PHP Version:

5CVS-2005-04-11

OS:

FreeBSD 4.11-STABLE

Private report:

CVE-ID:

None

View Developer Edit

Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.

Password:

Status:
Package:
Bug Type:
Summary:
From:	root at mediamonks dot net
New email:
PHP Version:		OS:

New Comment:

[2005-02-15 13:44 UTC] root at mediamonks dot net

Description:
------------
Apache 2.0.53 & mod_php5 5.0.3

Sessions occasionally work, but in two-thirds of the session requests an error is generated and the apache child segfaults.

Error recorded in the logfile:

PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0

Error reported on site:

Notice: Undefined variable: HTTP_SESSION_VARS in <file>
Notice: Undefined variable: _SESSION in in <file>
Warning: session_register() [function.session-register]: Cannot find save handler  in <file>
Warning: session_register() [function.session-register]: Cannot find save handler  in <file>

I'm using php.ini-recommended as php.ini.

Tried commenting out session.save_handler, setting it to "files" and just files.

Reproduce code:
---------------
session_start();

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports

[2005-02-15 14:30 UTC] root at mediamonks dot net

with notices on the log file records:

PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0
PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0
PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0
[Tue Feb 15 14:27:45 2005] [notice] child pid 83780 exit signal Segmentation fault (11)
[Tue Feb 15 14:27:45 2005] [notice] child pid 83776 exit signal Segmentation fault (11)
[Tue Feb 15 14:27:45 2005] [notice] child pid 83710 exit signal Segmentation fault (11)
PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0
PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0
[Tue Feb 15 14:27:48 2005] [notice] child pid 83752 exit signal Segmentation fault (11)
[Tue Feb 15 14:27:48 2005] [notice] child pid 83713 exit signal Segmentation fault (11)

[2005-02-16 16:02 UTC] root at mediamonks dot net

That CVS build has screwed even more on my system...

Log file records:

httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
Allowed memory size of 16777216 bytes exhausted (tried to allocate 1 bytes)
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
httpd in free(): warning: page is already free
[Wed Feb 16 16:00:54 2005] [notice] child pid 21258 exit signal Segmentation fault (11)

This repeats thousands of times, apache children segfault after each 10 or so, original save handler error remains.

[2005-02-18 13:09 UTC] root at mediamonks dot net

I thought I'd give the mm handler a try as a workaround, but the same problem is present there:

PHP Fatal error:  Unknown: Cannot find save handler \x02 in Unknown on line 0
[Fri Feb 18 13:08:04 2005] [notice] child pid 73434 exit signal Segmentation fault (11)

[2005-02-26 22:47 UTC] root at mediamonks dot net

Backtrace:

#0  ps_mm_destroy (data=0x82df880) at /home/terrence/php/php5-STABLE-200502211130/ext/session/mod_mm.c:243
#1  0x284d0a1d in zm_shutdown_ps_mm (type=1, module_number=3)
    at /home/terrence/php/php5-STABLE-200502211130/ext/session/mod_mm.c:295
#2  0x284cf895 in zm_shutdown_session (type=1, module_number=3)
    at /home/terrence/php/php5-STABLE-200502211130/ext/session/session.c:1824
#3  0x2856acfa in module_destructor (module=0x82f0c80) at /home/terrence/php/php5-STABLE-200502211130/Zend/zend_API.c:1500
#4  0x2856d0bd in zend_hash_apply_deleter (ht=0x285e8360, p=0x82efd00)
    at /home/terrence/php/php5-STABLE-200502211130/Zend/zend_hash.c:574
#5  0x2856d1ee in zend_hash_graceful_reverse_destroy (ht=0x285e8360)
    at /home/terrence/php/php5-STABLE-200502211130/Zend/zend_hash.c:640
#6  0x28566f34 in zend_shutdown () at /home/terrence/php/php5-STABLE-200502211130/Zend/zend.c:699
#7  0x28538b54 in php_module_shutdown () at /home/terrence/php/php5-STABLE-200502211130/main/main.c:1516
#8  0x28538b23 in php_module_shutdown_wrapper (sapi_globals=0x285e3140)
    at /home/terrence/php/php5-STABLE-200502211130/main/main.c:1491
#9  0x285a3d85 in php_apache_server_shutdown (tmp=0x0)
    at /home/terrence/php/php5-STABLE-200502211130/sapi/apache2handler/sapi_apache2.c:331
#10 0x2831d8f8 in run_cleanups () from /usr/local/lib/apache2/libapr-0.so.9
#11 0x2831cd11 in apr_pool_clear () from /usr/local/lib/apache2/libapr-0.so.9
#12 0x806890e in main ()
#13 0x805ce2e in _start ()

[2005-02-28 20:25 UTC] sniper@php.net

What was the configure line you used to configure PHP?

[2005-02-28 20:35 UTC] root at mediamonks dot net

'./configure' '--enable-versioning' '--enable-memory-limit' '--with-layout=GNU' '--with-config-file-scan-dir=/usr/local/etc/php' '--disable-all' '--enable-libxml' '--with-libxml-dir=/usr/local' '--enable-session' '--enable-spl' '--with-regex=php' '--disable-cli' '--with-apxs2=/usr/local/sbin/apxs' '--disable-ipv6' '--prefix=/usr/local' 

and

'./configure' '--enable-versioning' '--enable-memory-limit' '--with-layout=GNU' '--with-config-file-scan-dir=/usr/local/etc/php' '--disable-all' '--enable-libxml' '--with-libxml-dir=/usr/local' '--with-mm' '--enable-session' '--enable-spl' '--with-regex=php' '--disable-cli' '--with-apxs2=/usr/local/sbin/apxs' '--disable-ipv6' '--prefix=/usr/local'

[2005-03-21 11:13 UTC] sniper@php.net

Try without --enable-versioning

[2005-03-21 12:21 UTC] root at mediamonks dot net

does not change anything

[2005-04-11 08:24 UTC] root at mediamonks dot net

I thought I'd try attaching gdb to an apache child and provoke a segfault with the latest stable CVS snapshot. 

The result is:

Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x285d9179 in php_apache_sapi_ub_write (
    str=0x80ca924 "<br />\n<b>Fatal error</b>:  Unknown: Cannot find save handler \002 in <b>Unknown</b> on line <b>0</b><br />\n", str_length=105) at /home/terrence/php/php5-STABLE-200504110038/sapi/apache2handler/sapi_apache2.c:76
76              r = ctx->r;
(gdb) bt
#0  0x285d9179 in php_apache_sapi_ub_write (
    str=0x80ca924 "<br />\n<b>Fatal error</b>:  Unknown: Cannot find save handler \002 in <b>Unknown</b> on line <b>0</b><br />\n", str_length=105) at /home/terrence/php/php5-STABLE-200504110038/sapi/apache2handler/sapi_apache2.c:76
#1  0x2857567f in php_ub_body_write_no_header (
    str=0x80ca924 "<br />\n<b>Fatal error</b>:  Unknown: Cannot find save handler \002 in <b>Unknown</b> on line <b>0</b><br />\n", str_length=105) at /home/terrence/php/php5-STABLE-200504110038/main/output.c:684
#2  0x28574592 in php_body_write (
    str=0x80ca924 "<br />\n<b>Fatal error</b>:  Unknown: Cannot find save handler \002 in <b>Unknown</b> on line <b>0</b><br />\n", str_length=105) at /home/terrence/php/php5-STABLE-200504110038/main/output.c:119
#3  0x28564667 in php_printf (format=0x285f5f20 "%s<br />\n<b>%s</b>:  %s in <b>%s</b> on line <b>%d</b><br />\n%s")
    at /home/terrence/php/php5-STABLE-200504110038/main/main.c:399
#4  0x28565192 in php_error_cb (type=1, error_filename=0x28611b8b "Unknown", error_lineno=0, format=0x285f5cb4 "%s", 
    args=0xbfbff1e0 "$\2174\b\021]_(0") at /home/terrence/php/php5-STABLE-200504110038/main/main.c:740
#5  0x285a857b in zend_error (type=1, format=0x285f5cb4 "%s") at /home/terrence/php/php5-STABLE-200504110038/Zend/zend.c:921
#6  0x28564aff in php_verror (docref=0x0, params=0x285f5b58 "", type=1, format=0x285dcf77 "Cannot find save handler %s", 
    args=0xbfbff294 "?~4\b?\221b(?~4\b????\233~[(") at /home/terrence/php/php5-STABLE-200504110038/main/main.c:539
#7  0x28564c3d in php_error_docref0 (docref=0x0, type=1, format=0x285dcf77 "Cannot find save handler %s")
    at /home/terrence/php/php5-STABLE-200504110038/main/main.c:559
#8  0x284d2d3e in OnUpdateSaveHandler (entry=0x82f7a00, new_value=0x8347ee4 "\002", new_value_length=5, mh_arg1=0x0, mh_arg2=0x0, 
    mh_arg3=0x0, stage=16) at /home/terrence/php/php5-STABLE-200504110038/ext/session/session.c:102
#9  0x285b7e9b in zend_alter_ini_entry (name=0x835d0e0 "session.save_handler", name_length=21, new_value=0x835c600 "\002", 
    new_value_length=5, modify_type=2, stage=16) at /home/terrence/php/php5-STABLE-200504110038/Zend/zend_ini.c:227
#10 0x285da754 in apply_config (dummy=0x8107350)
    at /home/terrence/php/php5-STABLE-200504110038/sapi/apache2handler/apache_config.c:169
#11 0x285d9c1c in php_handler (r=0x8355050) at /home/terrence/php/php5-STABLE-200504110038/sapi/apache2handler/sapi_apache2.c:452
#12 0x8063f34 in ap_run_handler ()
#13 0x806448d in ap_invoke_handler ()
#14 0x806173f in ap_process_request ()
#15 0x805d217 in ap_process_http_connection ()
#16 0x806cc10 in ap_run_process_connection ()
#17 0x806ced4 in ap_process_connection ()
#18 0x8062b3b in child_main ()
#19 0x8062c92 in make_child ()
#20 0x8062cee in startup_children ()
#21 0x8063037 in ap_mpm_run ()
#22 0x8068aac in main ()
#23 0x805ce2e in _start ()

[2005-04-11 08:45 UTC] root at mediamonks dot net

The following "patch" fixes all the errors, and everything works as usual after applying it:

--- session.c   Thu Mar 24 02:32:45 2005
+++ session-new.c       Mon Apr 11 08:39:38 2005
@@ -96,6 +96,8 @@
 {
        SESSION_CHECK_ACTIVE_STATE;
 
+       new_value="files";
        PS(mod) = _php_find_ps_module(new_value TSRMLS_CC);
 
        if (PG(modules_activated) && !PS(mod)) {

[2005-07-10 19:59 UTC] sniper@php.net

Please try using this CVS snapshot:

  http://snaps.php.net/php5-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5-win32-latest.zip

[2005-07-18 01:00 UTC] php-bugs at lists dot php dot net

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

[2008-01-18 10:17 UTC] yogesh dot kumar3 at wipro dot com

Hi All,

I am also getting the session error.

The error is as follows:
<<
Warning: session_register() [function.session-register]: open(C:\DOCUME~1\yogumum\Local Settings\Temp\php\session\sess_cd6155c9cbe0eeb55bcc26cfb9c13907, O_RDWR) failed: No such file or directory (2) in D:\jakarta-tomcat-5.0.30\webapps\sns\lib\include\Auth.php on line 289
>>

Please help me in resolving the issue.

Thanks,
Yogesh

	php.net \| support \| documentation \| report a bug \| advanced search \| search howto \| statistics \| random bug \| login
go to bug id or search bugs for


Copyright © 2001-2024 The PHP Group All rights reserved.	Last updated: Sat Dec 21 12:01:31 2024 UTC