Mdworker (Launchd) using CPU 100%

I'm using 10.8.2. I've observed today in the activity monitor that "mdworker" is using 100% of my CPU. When I click the 'inspect' button it showed "launchd" as the parent process for "mdworker". My CPU temperature is in between 70 to 80 celcius. This is going on from the last 2-3 hours. My harddisk has almost 75% free space of the total space(500GB). The spotlight search icon in the menu bar is blank(No dot in it) i.e., spotlight is not indexing. Why is this happening even though when spotlight is not indexing?
I've not connected or mounted any external drives. I've installed skydrive app a few days ago. I've updated to 10.8.2 last night. And I've also installed the Macbook pro 2012 firmware update released last night for non retina mid 2012 models.

I have got the same problem here. Mdworker and Mds take up between 40% and 60% of my CPU resources. Excluding all drives from Spotlight does not make a difference. Neither does reindexing.
According to some other threads it has some thing to do with sandboxing:
mdworker[299]: Unable to talk to lsboxd
sandboxd[296] ([299]): mdworker(299) deny mach-lookup com.apple.ls.boxd
kernel[0]: Sandbox: sandboxd(314) deny mach-lookup com.apple.coresymbolicationd
Lets hope Apple releases a fix soon.

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