title: Error: while trying to restart mysql
body: <p>i am trying to restart mysql service, but the following error log is disturbing me.
  help me to out from the situation...
  here is the config file.. 
  <strong><em>my.cnf:</em></strong></p>
  
  <pre><code>[mysqld]
  bind-address = 0.0.0.0
  #server-id = 2
  #master-host=192.168.10.110
  #master-connect-retry=60
  #master-user=slave
  #master-password=slave
  #replicate-do-db=repltest
  max_connections=500
  datadir=/var/lib/mysql
  socket=/var/lib/mysql/mysql.sock
  user=mysql
  
  symbolic-links=0
  </code></pre>
  
  <p>here i attached the log file details... 
  <strong><em>log file:</em></strong></p>
  
  <pre><code>2016-04-28T06:13:45.032226Z 0 [Note] Server hostname (bind-address): '0.0.0.0'; port: 3306
  2016-04-28T06:13:45.032454Z 0 [Note]   - '0.0.0.0' resolves to '0.0.0.0';
  2016-04-28T06:13:45.032669Z 0 [Note] Server socket created on IP: '0.0.0.0'.
  2016-04-28T06:13:45.088670Z 0 [ERROR] Fatal error: mysql.user table is damaged. Please run mysql_upgrade.
  2016-04-28T06:13:45.088806Z 0 [ERROR] Aborting
  
  2016-04-28T06:13:45.088828Z 0 [Note] Binlog end
  2016-04-28T06:13:45.088935Z 0 [Note] Shutting down plugin 'ngram'
  2016-04-28T06:13:45.088951Z 0 [Note] Shutting down plugin 'partition'
  2016-04-28T06:13:45.088960Z 0 [Note] Shutting down plugin 'BLACKHOLE'
  2016-04-28T06:13:45.088968Z 0 [Note] Shutting down plugin 'ARCHIVE'
  2016-04-28T06:13:45.088984Z 0 [Note] Shutting down plugin 'MRG_MYISAM'
  2016-04-28T06:13:45.088993Z 0 [Note] Shutting down plugin 'INNODB_SYS_VIRTUAL'
  2016-04-28T06:13:45.089001Z 0 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
  2016-04-28T06:13:45.089007Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
  2016-04-28T06:13:45.089013Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
  2016-04-28T06:13:45.089019Z 0 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
  2016-04-28T06:13:45.089025Z 0 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
  2016-04-28T06:13:45.089030Z 0 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
  2016-04-28T06:13:45.089036Z 0 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
  2016-04-28T06:13:45.089042Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
  2016-04-28T06:13:45.089048Z 0 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
  2016-04-28T06:13:45.089054Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
  2016-04-28T06:13:45.089060Z 0 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
  2016-04-28T06:13:45.089065Z 0 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
  2016-04-28T06:13:45.089071Z 0 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
  2016-04-28T06:13:45.089077Z 0 [Note] Shutting down plugin 'INNODB_FT_DELETED'
  2016-04-28T06:13:45.089083Z 0 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
  2016-04-28T06:13:45.089088Z 0 [Note] Shutting down plugin 'INNODB_METRICS'
  2016-04-28T06:13:45.089094Z 0 [Note] Shutting down plugin 'INNODB_TEMP_TABLE_INFO'
  2016-04-28T06:13:45.089100Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
  2016-04-28T06:13:45.089105Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
  2016-04-28T06:13:45.089111Z 0 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
  2016-04-28T06:13:45.089117Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
  2016-04-28T06:13:45.089122Z 0 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
  2016-04-28T06:13:45.089128Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
  2016-04-28T06:13:45.089134Z 0 [Note] Shutting down plugin 'INNODB_CMPMEM'
  2016-04-28T06:13:45.089140Z 0 [Note] Shutting down plugin 'INNODB_CMP_RESET'
  2016-04-28T06:13:45.089146Z 0 [Note] Shutting down plugin 'INNODB_CMP'
  2016-04-28T06:13:45.089151Z 0 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
  2016-04-28T06:13:45.089157Z 0 [Note] Shutting down plugin 'INNODB_LOCKS'
  2016-04-28T06:13:45.089163Z 0 [Note] Shutting down plugin 'INNODB_TRX'
  2016-04-28T06:13:45.089169Z 0 [Note] Shutting down plugin 'InnoDB'
  2016-04-28T06:13:45.089256Z 0 [Note] InnoDB: FTS optimize thread exiting.
  2016-04-28T06:13:45.089373Z 0 [Note] InnoDB: Starting shutdown...
  2016-04-28T06:13:45.189628Z 0 [Note] InnoDB: Dumping buffer pool(s) to /var/lib/mysql/ib_buffer_pool
  2016-04-28T06:13:45.189978Z 0 [Note] InnoDB: Buffer pool(s) dump completed at 160428 11:43:45
  2016-04-28T06:13:46.934177Z 0 [Note] InnoDB: Shutdown completed; log sequence number 49822303
  2016-04-28T06:13:46.936105Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
  2016-04-28T06:13:46.936121Z 0 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
  2016-04-28T06:13:46.936169Z 0 [Note] Shutting down plugin 'MEMORY'
  2016-04-28T06:13:46.936179Z 0 [Note] Shutting down plugin 'CSV'
  2016-04-28T06:13:46.936184Z 0 [Note] Shutting down plugin 'MyISAM'
  2016-04-28T06:13:46.936196Z 0 [Note] Shutting down plugin 'sha256_password'
  2016-04-28T06:13:46.936200Z 0 [Note] Shutting down plugin 'mysql_native_password'
  2016-04-28T06:13:46.936321Z 0 [Note] Shutting down plugin 'binlog'
  2016-04-28T06:13:46.936427Z 0 [Note] /usr/sbin/mysqld: Shutdown complete
  
  2016-04-28T06:13:46.947072Z mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
  </code></pre>