High CPU Usage After KB958644

Hi,

We installed the critical update KB958644 on a Windows Server 2008

machine 2 days ago and have experienced a massive increase in CPU

utilisation, apparently for the System process. Our performance

monitor reports typically showed the web server running in the 5-15%

CPU utilisation range for the whole day even under fairly heavy load.

For the last 2 days, the CPU graph now looks like an earthquake has

hit and we have had to reboot the server both days to reset the CPU to

normal.

Today, the graph was showing 90%+ CPU utilisation and we were not able

to RDP to the box and all web sites were non-responsive so had to get

the ISP to do a hard reboot. The graph showed the server in this 90%+

CPU usage state for several hours before we were made aware of the

problem so it was not just a temporary problem.

Has anyone else had problems with this security update? If we have

this problem again tomorrow, then I think we will have to uninstall

the update and ensure we are as secure as possible with the

workarounds in the technet article.

Thanks,

Jason