Bugs item #3544930, was opened at 2012-07-17 00:06
Message generated for change (Tracker Item Submitted) made by kargor
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Category: Consistency
Group: None
Status: Open
Resolution: None
Priority: 6
Private: No
Submitted By: Stefan Rossbach (kargor)
Assigned to: Nobody/Anonymous (nobody)
Summary: Race condition when synchronizing user lists

Initial Comment:
Host: A
Client: B
Client: C
Client: D

D invites E

First bug:  The host does not know anything as long as D has not synchronized 
the user lists, but E does !

Second bug:

Instead of D, A invites E

While synchronizing the user lists, following can happen:

A tells E that B,C and D are part of the session. E now may send an activity to 
B,C and D (e.g its color).

B,C and D does not know anything about E yet, discarding the activity and 
blowing up their ActivitySequencer for E, because when
E sends another activity (now B,C and D may know E), the sequencer is still 
waiting for the former activity which was discarded. The sequencer stalls
for E unless a timeout occured AND E sends another activity.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=843359&aid=3544930&group_id=167540

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