mysqld process hanging

[Knight Raider]

I saw in my log file and I get an error  as below

Number of processes running now: 1
mysqld process hanging, pid 9444 - killed
030528 20:21:21  mysqld restarted
/usr/libexec/mysqld: ready for connections

and there is a lot of error message like that.
what happen and how to solve that.?

thanks in advance

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