Date: Mon, 5 Feb 2007 05:54:25 -0600 From: Terry Todd <tlt@badger.tltodd.com> To: freebsd-questions@freebsd.org Subject: Re: phpMyAdmin httpd segmentation fault Message-ID: <20070205055425.A68136@badger.tltodd.com> In-Reply-To: <45C5A93A.8010501@infracaninophile.co.uk>; from m.seaman@infracaninophile.co.uk on Sun, Feb 04, 2007 at 09:36:58AM %2B0000 References: <20070203204156.A4743@badger.tltodd.com> <45C5A93A.8010501@infracaninophile.co.uk>
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On Sun, Feb 04, 2007 at 09:36:58AM +0000, Matthew Seaman wrote:
> Terry Todd wrote:
> > I installed FreeBSD 6.2-RELEASE, php-5.1.6_3, php5-extensions-1.0,
> > mysql-5.0.27 and apache_1.3.37_1.
> >
> > php -i now works Ok after I moved recode.so to the top of the list
> > of extensions in extensions.ini. It took a while to figure that
> > one out. Before that php -i would seg fault and core dump. It
> > took some google searching and using gdb on the core file to fix
> > it.
> >
> > A test web page for phpinfo works fine too. Mysql works OK from
> > the command line.
> >
> > However I can't get phpMyAdmin to work. It seg faults in reading
> > /usr/local/www/phpMyAdmin/libraries/url_generating.lib.php
> > There is no core dump produced.
>
> Hmmm... very strange. We have just built a RELENG_6_2 server with
> apache13-ssl, php5 and phpMyAdmin and no such problems are apparent.
>
> Did you modify the CFLAGS or otherwise change the level of
> optimization used by the compiler?
No CFLAGS were changed or anything else. It's a very standard install.
>
> > I ran ktrace httpd -X
> >
> > Then when I try to open the phpMyAdmin/index.php page in a browser
> > httpd seg faults.
> >
> > Here is the tail of kdump from the ktrace.out from the above ktrace.
> >
> > ....
> > 1372 httpd CALL gettimeofday(0xbfbf7158,0)
> > 1372 httpd RET gettimeofday 0
> > 1372 httpd CALL lstat(0xbfbf75b0,0xbfbf70f0)
> > 1372 httpd NAMI "/usr"
> > 1372 httpd RET lstat 0
> > 1372 httpd CALL lstat(0xbfbf75b0,0xbfbf70f0)
> > 1372 httpd NAMI "/usr/local"
> > 1372 httpd RET lstat 0
> > 1372 httpd CALL lstat(0xbfbf75b0,0xbfbf70f0)
> > 1372 httpd NAMI "/usr/local/www"
> > 1372 httpd RET lstat 0
> > 1372 httpd CALL lstat(0xbfbf75b0,0xbfbf70f0)
> > 1372 httpd NAMI "/usr/local/www/phpMyAdmin"
> > 1372 httpd RET lstat 0
> > 1372 httpd CALL lstat(0xbfbf75b0,0xbfbf70f0)
> > 1372 httpd NAMI "/usr/local/www/phpMyAdmin/libraries"
> > 1372 httpd RET lstat 0
> > 1372 httpd CALL lstat(0xbfbf75b0,0xbfbf70f0)
> > 1372 httpd NAMI "/usr/local/www/phpMyAdmin/libraries/url_generating.lib.php"
> > 1372 httpd RET lstat 0
> > 1372 httpd CALL open(0x845eda8,0,0x1b6)
> > 1372 httpd NAMI "/usr/local/www/phpMyAdmin/libraries/url_generating.lib.php"
> > 1372 httpd RET open 4
> > 1372 httpd CALL fstat(0x4,0x8102748)
> > 1372 httpd RET fstat 0
> > 1372 httpd CALL lseek(0x4,0,0,0,0x1)
> > 1372 httpd RET lseek 0
> > 1372 httpd CALL read(0x4,0x82e3028,0x2000)
> > 1372 httpd GIO fd 4 read 4096 bytes
> > "<?php
> > /* $Id: url_generating.lib.php,v 2.12.2.1 2006/09/26 19:23:24 lem9 Exp $ */
> > // vim: expandtab sw=4 ts=4 sts=4:
> >
> >
> > /**
> > * URL/hidden inputs generating.
> > */
> >
> >
> > /**
> > * Generates text with hidden inputs.
> > *
> > * @see PMA_generate_common_url()
> > * @param string optional database name
> > * @param string optional table name
> > * @param int indenting level
> > *
> > * @return string string with input fields
> > *
> > * @global string the current language
> > * @global string the current conversion charset
> > * @global string the current connection collation
> > * @global string the current server
> > * @global array the configuration array
> > * @global boolean whether recoding is allowed or not
> > *
> > *
> > * @access public
> > *
> > * @author nijel
> > */
> > function PMA_generate_common_hidden_inputs($db = '', $table = '', $indent = 0, $skip = array())
> > {
> > if (is_array($db)) {
> > $params =& $db;
> > $_indent = empty($table) ? $indent : $table;
> > $_skip = empty($indent) ? $skip : $indent;
> > $indent =& $_indent;
> > $skip =& $_skip;
> > } else {
> > $params = array();
> > if (isset($db) && strlen($db)) {
> > $params['db'] = $db;
> > }
> > if (isset($table) && strlen($table)) {
> > $params['table'] = $table;
> > }
> > }
> >
> > if (! empty($GLOBALS['server'])
> > && $GLOBALS['server'] != $GLOBALS['cfg']['ServerDefault']) {
> > $params['server'] = $GLOBALS['server'];
> > }
> > if (empty($_COOKIE['pma_lang'])
> > && ! empty($GLOBALS['lang'])) {
> > $params['lang'] = $GLOBALS['lang'];
> > }
> > if (empty($_COOKIE['pma_charset'])
> > && ! empty($GLOBALS['convcharset'])) {
> > $params['convcharset'] = $GLOBALS['convcharset'];
> > }
> > if (empty($_COOKIE['pma_collation_connection'])
> > && ! empty($GLOBALS['collation_connection'])) {
> > $params['collation_connection'] = $GLOBALS['collation_connection'];
> > }
> >
> > $params['token'] = $_SESSION[' PMA_token '];
> >
> > if (! is_array($skip)) {
> > if (isset($params[$skip])) {
> > unset($params[$skip]);
> > }
> > } else {
> > foreach ($skip as $skipping) {
> > if (isset($params[$skipping])) {
> > unset($params[$skipping]);
> > }
> > }
> > }
> >
> > $spaces = str_repeat(' ', $indent);
> >
> > $return = '';
> > foreach ($params as $key => $val) {
> > $return .= $spaces . '<input type="hidden" name="' . htmlspecialchars($key) . '" value="' . htmlspecialchars(\
> > $val) . '" />' . "\\n";
> > }
> >
> > return $return;
> > }
> >
> > /**
> > * Generates text with URL parameters.
> > *
> > * <code>
> > * // note the ?
> > * echo 'script.php?' . PMA_generate_common_url('mysql', 'rights');
> > * // produces with cookies enabled:
> > * // script.php?db=mysql&table=rights
> > * // with cookies disabled:
> > * // script.php?server=1&lang=en-utf-8&db=mysql&table=rights
> > *
> > * $params['myparam'] = 'myvalue';
> > * $params['db'] = 'mysql';
> > * $params['table'] = 'rights';
> > * // note the missing ?
> > * echo 'script.php' . PMA_generate_common_url($params);
> > * // produces with cookies enabled:
> > * // script.php?myparam=myvalue&db=mysql&table=rights
> > * // with cookies disabled:
> > * // script.php?server=1&lang=en-utf-8&myparam=myvalue&db=mysql&table=rights
> > *
> > * // note the missing ?
> > * echo 'script.php' . PMA_generate_common_url();
> > * // produces with cookies enabled:
> > * // script.php
> > * // with cookies disabled:
> > * // script.php?server=1&lang=en-utf-8
> > * </code>
> > *
> > * @param mixed assoc. array with url params or optional string with database name
> > * if first param is an array there is also an ? prefixed to the url
> > * @param string optional table name only if first param is array
> > * @param string character to use instead of '&' for deviding
> > * multiple URL parameters from each other
> > *
> > * @return string string with URL parameters
> > *
> > * @global string the current language
> > * @global string the current conversion charset
> > * @global string the current connection collation
> > * @global string the current server
> > * @global arra"
> > 1372 httpd RET read 6467/0x1943
> > 1372 httpd CALL read(0x4,0x82e3028,0x2000)
> > 1372 httpd GIO fd 4 read 0 bytes
> > ""
> > 1372 httpd RET read 0
> > 1372 httpd CALL read(0x4,0x82e3028,0x2000)
> > 1372 httpd GIO fd 4 read 0 bytes
> > ""
> > 1372 httpd RET read 0
> > 1372 httpd CALL close(0x4)
> > 1372 httpd RET close 0
> > 1372 httpd PSIG SIGSEGV SIG_DFL
> >
> >
> > I moved url_generating.lib.php to url_generating.lib.php.sav and
> > copied url_generating.lib.php.sav to a new url_generating.lib.php.
> > Same thing happens.
> >
> > I tried the latest phpMyAdmin-2.9.2 and it does the exact same thing.
> >
> > It always seg faults in the exact same place in the exact same way.
> >
> > /var/log/messages file gets:
> > Feb 3 16:07:38 testbox kernel: pid 8512 (httpd), uid 80: exited on signal 11
>
> Hmmm... a SEGV in apache or one of it's loaded modules should result
> in a core file in the cwd of the apache process. The general way to
> switch that behaviour off is by using the limits(1) command to set
> coredumpsize=0 -- and you can use /etc/login.conf to set limits for
> a whole class of users. If the apache startup scripts
> are running eg:
>
> eval `limits -e -C daemon`
>
> or similar that might be the cause. However, the default settings
> are 'coredumpsize=unlimited' for all, and I guess you'ld know if you'ld
> changed any of that sort of thing.
>
> Hmmm... cwd for the Apache process is set to the root directory, like
> all good daemons should. You can see that by:
>
> fstat -p `cat /var/run/httpd.pid`
>
> For very obvious security reasons, the root directory should not
> be writable by daemon processes with network listeners (and conversely,
> daemons should never be run as root or any other UID with write access,
> well, anywhere much). In this case, however, and strictly for testing
> purposes, so long as it's on a machine not accessible from the Internet,
> temporarily making the root dir writable by the apache process could help
> get you a core file to analyse.
I changed / to mode 777 and reran the test. Same seg fault and still no core file.
When I say there is no core file I have checked with find / -name "*.core"
and there are no core files anywhere on the system.
>
> > /var/log/httpd-errors gets:
> > [Sat Feb 3 16:07:39 2007] [notice] child pid 8512 exit signal Segmentation fault (11)
> >
> > I am out of ideas on what to try next. Anyone else have any suggestions?
>
> Can you try unmounting and fsck'ing the partition (fsck -f /dev/adXsYz)
> where url_generating.lib.php lives?
I thought by creating a new url_generating.lib.php file that would test the problem
of there being a bad spot on the disk. fsck runs clean.
>
> Given that the error you are seeing is so repeatable, it is unlikely
> to be a hardware fault, but it may be worth running a cycle or two
> of memtest86 to see if it picks up anything.
>
> Otherwise the only thing I can think to try is the rather blunt approach
> of recompiling/reinstalling the phpMyAdmin port and everything it depends
> on:
>
> portupgrade -Rfi phpMyAdmin
I ran portupgrade -Rfv phpMyAdmin. It has a lot of dependencies
so it took a long time to finish and I didn't want to sit in front
of it and answer yes to all the questions.
It still does the exact same thing.
I'm stumped. I guess I'll try a new install on a different system.
Thanks,
Terry Todd
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