＜環境＞
Centos 6.6(64bit)
zabbix-server-2.4.6-1.el6.x86_64
mysql-5.1.73-5.el6_6.x86_64

・mysql起動中にzabbix-serverを起動するとmysql.logに以下が吐き出されてshutdownされる
150903 16:36:18 [Note] /usr/libexec/mysqld: Normal shutdown
150903 16:36:18 [Note] Event Scheduler: Purging the queue. 0 events
150903 16:36:20 InnoDB: Starting shutdown...
150903 16:36:25 InnoDB: Shutdown completed; log sequence number 8 2064664243
150903 16:36:25 [Note] /usr/libexec/mysqld: Shutdown complete
150903 16:36:25 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

・zabbix-server起動中にmysqlを起動すると数秒後に勝手に落とされる
150903 16:58:17 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
150903 16:58:17 InnoDB: Initializing buffer pool, size = 8.0M
150903 16:58:17 InnoDB: Completed initialization of buffer pool
150903 16:58:17 InnoDB: Started; log sequence number 8 2064664243
150903 16:58:17 [Note] Event Scheduler: Loaded 0 events

150903 16:58:17 [Note] /usr/libexec/mysqld: ready for connections.Version: '5.1.73-log' socket: '/var/lib/mysql/mysql.sock' port: 3306 Source distribution
150903 16:58:27 [Note] /usr/libexec/mysqld: Normal shutdown
150903 16:58:27 [Note] Event Scheduler: Purging the queue. 0 events
150903 16:58:29 InnoDB: Starting shutdown...
150903 16:58:32 InnoDB: Shutdown completed; log sequence number 8 2064664489
150903 16:58:32 [Note] /usr/libexec/mysqld: Shutdown complete
150903 16:58:32 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
※落とされるまでの数秒間は正常にブラウザでのアクセスが可能

・zabbix-serverのログレベルをデバッグにしてみたところ、以下のようなログがでました。
2698:20150903:163618.698 In substitute_simple_macros() data:'service mysqld restart'

どなたか、この現象の原因と解決方法がおわかりになる方いらっしゃいませんか？
どうぞ宜しくお願い致します。