Wrong throw in
 

Team A legally completes free throw. On ensuing throwin, TEAM A forgetfully takes it out of bounds and throws it in to Team A. Yes you read that right, just a lapse in concentration.

Is this any kind of penalty or just stoppage of play and reset everyone?

Let's Go To The Videotape ...
 

10.2.4 SITUATION: Immediately following a goal or free throw by Team A, A1 inbounds the ball to A2 and A2 subsequently throws the ball through A’s basket. RULING: The following procedure has been adopted to handle this specific situation if it is recognized before the opponents gain control or before the next throw-in begins: (a) charge Team A with an unsporting technical foul; (b) assess a delay-of-game warning for interfering with the ball after a goal; (c) cancel the field goal; (d) cancel any common foul(s) committed and any non-flagrant foul against A2 in the act of shooting; and (e) put “consumed” time back on the clock. COMMENT: If there is no doubt the throw-in was a result of confusion, the entire procedure would be followed except no unsporting team technical foul would be charged. A team technical would be assessed if the team had received a previous delay warning. This procedure shall not be used in any other throw-in situation in which an official administers the throw-in and a mistake allows the wrong team to inbound the ball. (4-47-3; 7-6-6; 10-1-5d)