Grazie ancora per le informazioni! Ma le impostazione del LogLevel come mi hai indicato ovviamente mi daranno informazioni sui prossimi eventuali crash non su quelli passati, vero?

Prima di tutto grazie della risposta. Domani mattina proverò a fare come mi hai suggerito. L'errore relativo al modulo threading.pyc è presente anche in altre righe del file di log relativi ad altre ore e non causa il crash del sito, come mai?

Salve, ho sviluppato un componente Joomla da installare sul un sito. Dopo averlo sviluppato in locale e testato numerossissime volte, ho installato il componente sul sito. Ho effettuato numerose prove e non mi ha dato nessun problema. Dopo 2-3 ore dall'istallazione però il sito crasha.
Questi sono i file di log di apache e mysql. Non riesco a capire cosa causa l'errore.

error_log:

[Sat Apr 13 17:16:53 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:16:55 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:28 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:29 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:29 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:29 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:30 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:33 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:35 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:37 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:37 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:40 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:46 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored
[Sat Apr 13 17:17:47 2013] [error] Exception KeyError: KeyError(140625816418272,) in <module 'threading' from '/usr/lib64/python2.6/threading.pyc'> ignored

[Sat Apr 13 18:30:46 2013] [notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[Sat Apr 13 18:30:46 2013] [notice] Digest: generating secret for digest authentication ...
[Sat Apr 13 18:30:46 2013] [notice] Digest: done
[Sat Apr 13 18:30:50 2013] [warn] mod_wsgi: Compiled for Python/2.6.2.
[Sat Apr 13 18:30:50 2013] [warn] mod_wsgi: Runtime using Python/2.6.6.
[Sat Apr 13 18:30:50 2013] [notice] Apache/2.2.15 (Unix) DAV/2 mod_fcgid/2.3.7 PHP/5.3.3 mod_ssl/2.2.15 OpenSSL/1.0.0-fips mod_wsgi/3.2 Python/2.6.6 configured -- resuming normal operations

mysqld.log:

121229 17:23:06 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
121229 17:23:06 InnoDB: Initializing buffer pool, size = 8.0M
121229 17:23:06 InnoDB: Completed initialization of buffer pool
121229 17:23:07 InnoDB: Started; log sequence number 0 3687006
121229 17:23:07 [Note] Event Scheduler: Loaded 0 events
121229 17:23:07 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
121229 17:25:10 [Note] /usr/libexec/mysqld: Normal shutdown

121229 17:25:10 [Note] Event Scheduler: Purging the queue. 0 events
121229 17:25:10 InnoDB: Starting shutdown...
121229 17:25:12 InnoDB: Shutdown completed; log sequence number 0 3687006
121229 17:25:12 [Note] /usr/libexec/mysqld: Shutdown complete

121229 17:25:12 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
121229 17:27:03 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
121229 17:27:04 InnoDB: Initializing buffer pool, size = 8.0M
121229 17:27:04 InnoDB: Completed initialization of buffer pool
121229 17:27:04 InnoDB: Started; log sequence number 0 3687006
121229 17:27:04 [Note] Event Scheduler: Loaded 0 events
121229 17:27:04 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
121229 17:40:12 [Note] /usr/libexec/mysqld: Normal shutdown

121229 17:40:12 [Note] Event Scheduler: Purging the queue. 0 events
121229 17:40:12 InnoDB: Starting shutdown...
121229 17:40:15 InnoDB: Shutdown completed; log sequence number 0 3687016
121229 17:40:15 [Note] /usr/libexec/mysqld: Shutdown complete

121229 17:40:15 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
121229 17:43:09 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
121229 17:43:09 InnoDB: Initializing buffer pool, size = 8.0M
121229 17:43:09 InnoDB: Completed initialization of buffer pool
121229 17:43:09 InnoDB: Started; log sequence number 0 3687016
121229 17:43:10 [Note] Event Scheduler: Loaded 0 events
121229 17:43:10 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.1.61' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution