Hi Everyone,
We are working through an issue with Syntax Highler extension. Highlighting fails, and the wiki page in question states "Pages with syntax highlighting errors". It is fairly obvious there's an error condition somewhere.
When we check the error log there's nothing present. The only thing present is the server restart (which baffles me since this is not an error):
$ tail -n 8 /var/log/httpd24/error_log [Fri Dec 22 20:54:04.238747 2017] [http2:warn] [pid 13535] AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive. [Fri Dec 22 20:54:04.258176 2017] [mpm_prefork:notice] [pid 13535] AH00163: Apache/2.4.27 (Red Hat) OpenSSL/1.0.2k-fips PHP/7.1.8 configured -- resuming normal operations [Fri Dec 22 20:54:04.258234 2017] [core:notice] [pid 13535] AH00094: Command line: '/opt/rh/httpd24/root/usr/sbin/httpd -D FOREGROUND'
How do we trouble shoot this further? What do folks do when errors are silently swallowed and no messages are logged?
Jeff
https://m.mediawiki.org/wiki/Manual:How_to_debug has some info about how to enable mediawiki debug logs.
For syntax highlight, the most common problem is an issue executing external commands. The mediawiki debug log, once enabled will tell you the exact command mediawiki is trying to execute.
-- brian
On Friday, December 22, 2017, Jeffrey Walton noloader@gmail.com wrote:
Hi Everyone,
We are working through an issue with Syntax Highler extension. Highlighting fails, and the wiki page in question states "Pages with syntax highlighting errors". It is fairly obvious there's an error condition somewhere.
When we check the error log there's nothing present. The only thing present is the server restart (which baffles me since this is not an error):
$ tail -n 8 /var/log/httpd24/error_log [Fri Dec 22 20:54:04.238747 2017] [http2:warn] [pid 13535]AH10034: The mpm module (prefork.c) is not supported by mod_http2. The mpm determines how things are processed in your server. HTTP/2 has more demands in this regard and the currently selected mpm will just not do. This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive. [Fri Dec 22 20:54:04.258176 2017] [mpm_prefork:notice] [pid 13535] AH00163: Apache/2.4.27 (Red Hat) OpenSSL/1.0.2k-fips PHP/7.1.8 configured -- resuming normal operations [Fri Dec 22 20:54:04.258234 2017] [core:notice] [pid 13535] AH00094: Command line: '/opt/rh/httpd24/root/usr/sbin/httpd -D FOREGROUND'
How do we trouble shoot this further? What do folks do when errors are silently swallowed and no messages are logged?
Jeff
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On Fri, Dec 22, 2017 at 9:28 PM, Brian Wolff bawolff@gmail.com wrote:
https://m.mediawiki.org/wiki/Manual:How_to_debug has some info about how to enable mediawiki debug logs.
For syntax highlight, the most common problem is an issue executing external commands. The mediawiki debug log, once enabled will tell you the exact command mediawiki is trying to execute.
Thanks Brian.
Is there something wrong with the shown configuration? Its not the full configuration; rather its the parts that are supposed to be catching errors. All the error related stuff is at the very end of each conf file.
Jeff
# tail /etc/opt/rh/rh-php71/php.ini
# Added by JW 12/21/2017 for MediaWiki migration log_errors = On display_errors = On display_startup_errors = On error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT error_log = /var/log/httpd24/error_log
# tail /var/www/html/wiki/LocalSettings.php
# Added by JW 12/21/2017 for MediaWiki migration $wgShowError = true; $wgShowErrors = true; $wgShowSQLError = true; $wgShowSQLErrors = true; $wgShowException = true; $wgShowExceptions = true; $wgShowExceptionDetails = true;
On Fri, Dec 22, 2017 at 9:47 PM, Jeffrey Walton noloader@gmail.com wrote:
On Fri, Dec 22, 2017 at 9:28 PM, Brian Wolff bawolff@gmail.com wrote:
https://m.mediawiki.org/wiki/Manual:How_to_debug has some info about how to enable mediawiki debug logs.
For syntax highlight, the most common problem is an issue executing external commands. The mediawiki debug log, once enabled will tell you the exact command mediawiki is trying to execute.
Thanks Brian.
Is there something wrong with the shown configuration? Its not the full configuration; rather its the parts that are supposed to be catching errors. All the error related stuff is at the very end of each conf file.
Jeff
# tail /etc/opt/rh/rh-php71/php.ini
# Added by JW 12/21/2017 for MediaWiki migration log_errors = On display_errors = On display_startup_errors = On error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT error_log = /var/log/httpd24/error_log
# tail /var/www/html/wiki/LocalSettings.php
# Added by JW 12/21/2017 for MediaWiki migration $wgShowError = true; $wgShowErrors = true; $wgShowSQLError = true; $wgShowSQLErrors = true; $wgShowException = true; $wgShowExceptions = true; $wgShowExceptionDetails = true;
I'm beginning to think this is broken. I still can't get one message logged to the error log.
Has there been chronic problems with error logging? Have people been having trouble for years? What do people normally do? Just give up?
Jeff
On Fri, Dec 22, 2017 at 9:47 PM, Jeffrey Walton noloader@gmail.com wrote:
On Fri, Dec 22, 2017 at 9:28 PM, Brian Wolff bawolff@gmail.com wrote:
https://m.mediawiki.org/wiki/Manual:How_to_debug has some info about how to enable mediawiki debug logs.
For syntax highlight, the most common problem is an issue executing external commands. The mediawiki debug log, once enabled will tell you the exact command mediawiki is trying to execute.
Thanks Brian.
Is there something wrong with the shown configuration? Its not the full configuration; rather its the parts that are supposed to be catching errors. All the error related stuff is at the very end of each conf file.
Jeff
# tail /etc/opt/rh/rh-php71/php.ini
# Added by JW 12/21/2017 for MediaWiki migration log_errors = On display_errors = On display_startup_errors = On error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT error_log = /var/log/httpd24/error_log
# tail /var/www/html/wiki/LocalSettings.php
# Added by JW 12/21/2017 for MediaWiki migration $wgShowError = true; $wgShowErrors = true; $wgShowSQLError = true; $wgShowSQLErrors = true; $wgShowException = true; $wgShowExceptions = true; $wgShowExceptionDetails = true;
I'm beginning to think this is broken. I still can't get one message logged to the error log.
Has there been chronic problems with error logging? Have people been having trouble for years? What do people normally do? Just give up?
When I needed to debug some MediaWiki extensions I followed the directions at
https://www.mediawiki.org/wiki/Manual:How_to_debug
I distilled that information into these personal notes I kept:
For debugging MediaWiki edit LocalSettings.php and add
error_reporting( -1 ); ini_set( 'display_errors', 1 );
$wgShowExceptionDetails = true; $wgDebugToolbar = true; $wgShowDebug = true; $wgDevelopmentWarnings = true;
$wgDebugLogFile = "/srv/mediawiki-1.28.2/logs/mw.log";
The directory for the log file MUST exist AND be writeable by the web user AND needs to be UNDER the MediaWiki installation.
Further debugging by editing PHP code and adding for example
wfDebug("DEBUG: " . print_r($some_variable, true));
This then shows up in the log file (and on screen if that debugging turned on).
HTH,
Scott K
On Friday, December 22, 2017, Jeffrey Walton noloader@gmail.com wrote:
On Fri, Dec 22, 2017 at 9:28 PM, Brian Wolff bawolff@gmail.com wrote:
https://m.mediawiki.org/wiki/Manual:How_to_debug has some info about how
to
enable mediawiki debug logs.
For syntax highlight, the most common problem is an issue executing
external
commands. The mediawiki debug log, once enabled will tell you the exact command mediawiki is trying to execute.
Thanks Brian.
Is there something wrong with the shown configuration? Its not the full configuration; rather its the parts that are supposed to be catching errors. All the error related stuff is at the very end of each conf file.
Jeff
# tail /etc/opt/rh/rh-php71/php.ini
# Added by JW 12/21/2017 for MediaWiki migration log_errors = On display_errors = On display_startup_errors = On error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT error_log = /var/log/httpd24/error_log
# tail /var/www/html/wiki/LocalSettings.php
# Added by JW 12/21/2017 for MediaWiki migration $wgShowError = true; $wgShowErrors = true; $wgShowSQLError = true; $wgShowSQLErrors = true; $wgShowException = true; $wgShowExceptions = true; $wgShowExceptionDetails = true;
Thats just for exceptions and fatal errors. You are looking for debug logs, which can be captured with $wgDebugLogFile as the other poster suggested.
-- brian
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