title: MySQL shutdown unexpectedly in XAMPP
body: <p>XAMPP's control panel displays error as </p>
  
  <blockquote>
    <p>Error: MySQL shutdown unexpectedly.<br>
    14:09:43  [mysql]   This may be due to a blocked port, missing dependencies, 
    improper privileges, a crash, or a shutdown by another method.</p>
  </blockquote>
  
  <p>Text in <code>mysql_error.log</code> is</p>
  
  <pre><code>3812 [Note] Plugin 'FEDERATED' is disabled.
   1604 InnoDB: Warning: Using innodb_additional_mem_pool_size is        DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB's internal memory allocator.
  [Note] InnoDB: Using atomics to ref count buffer pool pages
  [Note] InnoDB: The InnoDB memory heap is disabled
   [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
   [Note] InnoDB: Memory barrier is not used
   [Note] InnoDB: Compressed tables use zlib 1.2.3
   [Note] InnoDB: Not using CPU crc32 instructions
   [Note] InnoDB: Initializing buffer pool, size = 16.0M
   [Note] InnoDB: Completed initialization of buffer pool
   [Note] InnoDB: Restoring page 0 of tablespace 0
   [Warning] InnoDB: Doublewrite does not have page_no=0 of space: 0
   [ERROR] InnoDB: space header page consists of zero bytes in data file C:\xampp\mysql\data\ibdata1
   [ERROR] InnoDB: Could not open or create the system tablespace. If you tried to add new data files to the system tablespace, and it failed here, you should now edit innodb_data_file_path in my.cnf back to what it was, and remove the new ibdata files InnoDB created in this failed attempt. InnoDB only wrote those files full of zeros, but did not yet use them in any way. But be careful: do not remove old data files which contain your precious data!
         [ERROR] Plugin 'InnoDB' init function returned error.
   2015-04-15 14:09:43 3812 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
    [ERROR] Unknown/unsupported storage engine: InnoDB
     [ERROR] Aborting
  
  2015-04-15 14:09:43 3812 [Note] Binlog end
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'partition'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_FT_DELETED'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_METRICS'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
  2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_CMPMEM'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_CMP_RESET'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_CMP'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_LOCKS'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'INNODB_TRX'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'BLACKHOLE'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'ARCHIVE'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'MRG_MYISAM'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'MyISAM'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'MEMORY'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'CSV'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'sha256_password'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'mysql_old_password'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'mysql_native_password'
    2015-04-15 14:09:43 3812 [Note] Shutting down plugin 'binlog'
    2015-04-15 14:09:43 3812 [Note] c:\xampp\mysql\bin\mysqld.exe: Shutdown complete
  </code></pre>