InnoDB: Database was not shut down normally!

mysql crashes frequently

Solution : 1
Restart your machine.

If it does not solve the problem and mysql crashes frequently with same error.

Solution : 2
Check attribute max_allowed_packet in the file my.cnf

max_allowed_packet=128M
OR
max_allowed_packet=256M

Restart mysql.
If it is not there, add it and restart mysql.

but if it does not solve the problem and mysql crashes frequently with same error.

Solution : 3
Repair all databases of mysql using following commands.

mysqlcheck --no-defaults --check-upgrade --all-databases --auto-repair
mysqlcheck --no-defaults --all-databases --fix-db-names --fix-table-names

If still your mysql crashes frequently.
Reinstall it again.