A bad shutdown can cause such erros on MySQL.
InnoDB: Unable to lock ./ibdata1, error: 11 InnoDB: Check that you do not already have another mysqld process InnoDB: using the same InnoDB data or log files. InnoDB: Error in opening ./ibdata1
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mv ibdata1 ibdata1.bak cp -a ibdata1.bak ibdata1 service mysqld restart