Which mod outputs these numbers to STDOUT and why?

[monotonehell]

Quite often while people are playing I get standard output like this:

2012-12-14 15:09:15 [INFO] [STDOUT] -1911 64
2012-12-14 15:09:20 [INFO] [STDOUT] -1912 64
2012-12-14 15:09:24 [INFO] [STDOUT] -1913 64
2012-12-14 15:09:25 [INFO] [STDOUT] -1914 64
2012-12-14 15:09:25 [INFO] [STDOUT] -1915 64
2012-12-14 15:09:26 [INFO] [STDOUT] -1916 64

Any idea which mod is spitting this and what it means?
Just curious.

 

[Raymo2323]

I'm getting that too, a lot. It spams the chat so much. Also displays fall damage:

 

[b0bst3r]

I think this is the Rubber Boots bug, get everyone to remove their boots and see if it still occurs.

 

[Raymo2323]

mono,

I have lots of players, is it easy for you to test this?

 

[Nozart]

I told our players to jump and stop jumping, it seems to be related yeah

 

[b0bst3r]

Yeah the rubber boots are bugged (fixed in later version) so I would suggest you tell all your players to remove em or you'll get spammed to death.

 

[monotonehell]

Seems like it is rubber boots. The spam doesn't bother me too much. I was more curious as to what it was.

EDIT: Yep double checked with some people in game it is rubber boots. Mystery solved.