Happens to me since I updated my ubuntu 11.04 a couple days ago. It filled 
800GB of logs.
I had to kill it:

sudo killall -9 uvcdynctrl

it was repeating the message a zillion times:
[libwebcam] Warning: The driver behind device video0 has a slightly buggy 
implementation
  of the V4L2_CTRL_FLAG_NEXT_CTRL flag. It does not return the next higher
  control ID if a control query fails. A workaround has been enabled.


What even starts uvcdynctrl? Does it happen when I plug in the camera? When 
something opens the driver?

lsusb of the camera
Bus 005 Device 005: ID 1c4f:3002 SiGma Micro 

$ uvcdynctrl --version
uvcdynctrl 0.2.0

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https://bugs.launchpad.net/bugs/811604

Title:
  uvcdynctrl spams uvcdynctrl-udev.log and fills up filesystem

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