Fatal error: Can't open and lock privilege tables: Table '.\mysql\db' is marked as crashed and should be repaired

Problem:
C:\huypv>net start mysql
The mysql service is starting.
The mysql service could not be started.

#eventvwr
A system error has occurred.
System error 1067 has occurred.
The process terminated unexpectedly.

# mysql error log
Fatal error: Can't open and lock privilege tables: Table '.\mysql\db' is marked as crashed and should be repaired
For more information, see Help and Support Center at http://www.mysql.com.

Solved:
Edit file my.ini
Add line
innodb_force_recovery = 1
for [mysqld]

Start MySQL server with option --skip-grant-tables

Use MySQL client:
check table user;
repair table user;

Stop MySQL. Remove appended line in my.ini. Start MySQL server again, without option --skip-grant-tables