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Bug #31161 segfault when using phpMyAdmin
Submitted: 2004-12-17 22:33 UTC Modified: 2005-02-14 01:00 UTC
Votes:6
Avg. Score:4.2 ± 0.9
Reproduced:4 of 4 (100.0%)
Same Version:3 (75.0%)
Same OS:1 (25.0%)
From: phpbugs at majiclab dot com Assigned:
Status: No Feedback Package: MySQLi related
PHP Version: 5CVS-2004-12-17 (dev) OS: SuSE 9.1
Private report: No CVE-ID: None
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Rate the importance of this bug to you:

 [2004-12-17 22:33 UTC] phpbugs at majiclab dot com
Description:
------------
I decided to start a new bug, but I already posted this same comment in bug #30653.  Sorry if this causes confusion, but I thought it might be better to start a new bug after I realized that so many things had changed (different OS, different PHP version (4 vs. 5), etc.)  As well, I forgot my configure line (found at very bottom of post)...

I have some websites that run fine, with DB connection through mysqli. 
However, browsing to the phpMyAdmin page causes a segfault.  I am using
phpMyAdmin-2.6.0-pl3.  Previously, before it would segfault, phpMyAdmin
would not even let me login, returning me this error: "SELECT VERSION()
as version", empty result set returned (or something like that).  So I
have never had phpMyAdmin working at all, but it never segfaulted
before.

I am really confused, and hopefully a somewhat serious bug can be found
of this, as I have been having several random segfault parties (times
where certain code segfaults for no apparent reason).

A little more info:

I am running a AMD 64 3200+, 512MB RAM, SuSE 9.1 (kernel-2.6.4,
glibc-2.3.3)

Thanks for any help/fixes!

-Andrew

'./configure' '--prefix=/usr/local/php5' '--with-apxs2=/usr/local/apache2/bin/apxs' '--with-libxml-dir=/usr/local/lib' '--with-zlib' '--with-zlib-dir=/usr/local/lib' '--with-mysqli=/usr/local/mysql/bin/mysql_config' '--enable-sockets' '--enable-exif'

Reproduce code:
---------------
Not sure.  If anybody wants me to debug phpMyAdmin to try to make this process easier, then I can try that... but I'm hoping the backtrace might be enough.  This information might be valuable:

phpMyAdmin acutally works enough to ask me for my username/password.  If I enter the wrong username/password, it works fine, as in it keeps asking me for u/p.  However, once I enter the *correct* u/p, it then segfaults.  I will provide some pseudo code of the PMA_DBI_postConnect() function called after a succesful connect:

<?php
if (!defined('PMA_MYSQL_INT_VERSION')) {
    // this is where it used to not work before (SELECT VERSION() as version)
    $result = query("SELECT VERSION() as version");
    if ($result IS valid) {
        fetch_row();
        parse the version number;
    }

    if (mysql > 4.1) {  // true for me!
        change lang and charset options based on user info;
        call SET NAMES and SET CHARACTER SET; // if provided
    } else { // not true for me
        include phpmyadmin charset_conversion library;
    }
}
?>

Expected result:
----------------
phpMyAdmin to not cause a segfault, at least give me the other error
from before... (SELECT VERSION() as version returned empty result set) NOT segfault


Actual result:
--------------
zend_object_store_get_object (zobject=0x0) at
/usr/local/src/php5-STABLE-200412171930/Zend/zend_objects_API.c:202
202             return
EG(objects_store).object_buckets[handle].bucket.obj.object;

And I have the following backtrace:

#0  zend_object_store_get_object (zobject=0x0) at
/usr/local/src/php5-STABLE-200412171930/Zend/zend_objects_API.c:202
#1  0x0000002a9636005c in php_mysqli_fetch_into_hash (ht=Variable "ht"
is not available.
) at /usr/local/src/php5-STABLE-200412171930/ext/mysqli/mysqli.c:624
#2  0x0000002a9636a08f in zif_mysqli_fetch_array (ht=Variable "ht" is
not available.
) at
/usr/local/src/php5-STABLE-200412171930/ext/mysqli/mysqli_nonapi.c:189
#3  0x0000002a964965c4 in zend_do_fcall_common_helper
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2711
#4  0x0000002a964967d8 in zend_do_fcall_handler (execute_data=Variable
"execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2843
#5  0x0000002a964a04fe in execute (op_array=Variable "op_array" is not
available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:1400
#6  0x0000002a96496109 in zend_do_fcall_common_helper
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2740
#7  0x0000002a964967d8 in zend_do_fcall_handler (execute_data=Variable
"execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2843
#8  0x0000002a964a04fe in execute (op_array=Variable "op_array" is not
available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:1400
#9  0x0000002a96496109 in zend_do_fcall_common_helper
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2740
#10 0x0000002a964969c1 in zend_do_fcall_by_name_handler
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2825
#11 0x0000002a964a04fe in execute (op_array=Variable "op_array" is not
available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:1400
#12 0x0000002a96496109 in zend_do_fcall_common_helper
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2740
#13 0x0000002a964967d8 in zend_do_fcall_handler (execute_data=Variable
"execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2843
#14 0x0000002a964a04fe in execute (op_array=Variable "op_array" is not
available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:1400
#15 0x0000002a96496109 in zend_do_fcall_common_helper
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2740
#16 0x0000002a964969c1 in zend_do_fcall_by_name_handler
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:2825
#17 0x0000002a964a04fe in execute (op_array=Variable "op_array" is not
available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:1400
#18 0x0000002a964912fd in zend_include_or_eval_handler
(execute_data=Variable "execute_data" is not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:3565
#19 0x0000002a964a04fe in execute (op_array=Variable "op_array" is not
available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend_execute.c:1400
#20 0x0000002a9646812d in zend_execute_scripts (type=Variable "type" is
not available.
) at /usr/local/src/php5-STABLE-200412171930/Zend/zend.c:1069
#21 0x0000002a964307ff in php_execute_script (primary_file=Variable
"primary_file" is not available.
) at /usr/local/src/php5-STABLE-200412171930/main/main.c:1628
#22 0x0000002a964a0c44 in php_handler (r=Variable "r" is not available.
) at
/usr/local/src/php5-STABLE-200412171930/sapi/apache2handler/sapi_apache2
.c:537
#23 0x0000000000445631 in ap_run_handler (r=0x0) at config.c:151
#24 0x0000000000448479 in ap_invoke_handler (r=0x7535a0) at
config.c:363
#25 0x000000000042d2de in ap_process_request (r=0x7535a0) at
http_request.c:246
#26 0x0000000000428688 in ap_process_http_connection (c=0x746700) at
http_core.c:250
#27 0x00000000004503b1 in ap_run_process_connection (c=0x0) at
connection.c:42
#28 0x0000000000444600 in child_main (child_num_arg=Variable
"child_num_arg" is not available.
) at prefork.c:609
#29 0x0000000000444784 in make_child (s=0x5d0e88, slot=0) at
prefork.c:649
#30 0x000000000044485c in startup_children (number_to_start=5) at
prefork.c:721
#31 0x0000000000444f1c in ap_mpm_run (_pconf=Variable "_pconf" is not
available.
) at prefork.c:940
#32 0x000000000044aae0 in main (argc=Variable "argc" is not available.
) at main.c:617

I have been having somewhat random segfaults in other locations as well.
 I don't know if this will assist or is related at all, but I would
often get segfaults if I threw a new CException (a class extending
Exception) inside or nested inside a __destruct.  I don't know if this
is an "intentional" behavior, but I changed my code to not call those
functions/etc. from a __destruct.

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 [2004-12-17 22:39 UTC] phpbugs at majiclab dot com
I am also running MySQL 4.1.7.
 [2005-02-06 16:27 UTC] georg@php.net
Please try using this CVS snapshot:

  http://snaps.php.net/php5-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.0-win32-latest.zip

Please also try if disabling the query cache solves this 
problem. 
 [2005-02-14 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".
 
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