com.apple.kextcache: / locked; waiting for lock.

So, I've been having some trouble with my MacBook lately, a lot of freezing up, a spinning wheel or two. one kernel panic. So, I've started watching Console. I see this message almost every 30 seconds or so.

4/27/13 3:19:22.893 AM com.apple.kextcache: / locked; waiting for lock.

With nothing following it. So it looks like this:

4/27/13 3:26:34.433 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:10.325 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:10.689 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:25.591 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:30.868 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:38.103 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:43.513 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:27:52.173 AM com.apple.kextcache: / locked; waiting for lock.

4/27/13 3:28:06.006 AM com.apple.kextcache: / locked; waiting for lock.

What does it mean and should I be concerned?