MySQL started to consume about 40% of system CPU time and got unresponsive suddenly

Posted by Alex on Server Fault See other posts from Server Fault or by Alex
Published on 2012-07-08T21:00:23Z Indexed on 2012/07/08 21:17 UTC
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mysql

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cpu

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cpu-hogging

I use Debian 6.0.3 x86_64 and MySQL 5.5.20-1~dotdeb.0-log from the Dotdeb repository. MySQL process started to consume a lot of "sy" CPU time serveral hours ago according to this graph. I was not able to connect to running mysqld process and had to kill it. I found nothing useful in logs. My setup seems to be quite common (I assume Dotdeb just redistributes stock MySQL versions) and I have never seen anything like this before. What is the possible root cause of this? How can I prevent this situation in the future?

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