[ERROR] InnoDB: Unable to lock ./ibdata1,error: 11

The error is as follows:

2020-05-19 09:28:19 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:19 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:20 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:20 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:21 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:21 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:22 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:22 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:23 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:23 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:24 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:24 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:25 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:25 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:26 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:26 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:27 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:27 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:28 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:28 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:29 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:29 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:30 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:30 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:31 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:31 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:32 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:32 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
2020-05-19 09:28:33 11082 [ERROR] InnoDB: Unable to lock ./ibdata1, error: 11
2020-05-19 09:28:33 11082 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.

analysis:

The error shows that the file ./ibdata1 cannot be locked, so it must be occupied by another process

Solution:

We can use ps -aux |grep mysql*later to be related to the query, then query the PID, use the kill command to force kill, and then restart the database can be