mysql kill thread

jrhdpt02:/root# mysql -uroot -p'x' -e "show processlist" | grep query | grep localWarning: Using a password on the command line interface can be insecure.177550query_alllocalhostNULLSleep55NULLjrhdpt02:/root# mysql -uroot -p'x' -e "show processlist" | grep query | grep localWarning: Using a password on the command line interface can be insecure.177550query_alllocalhostNULLSleep70NULL177556query_alllocalhostNULLSleep2NULLmysql> show databases;ERROR 2006 (HY000): MySQL server has gone awayNo connection. Trying to reconnect...Connection id:    177575Current database: *** NONE ***