[reSIProcate] bug of ServerSubscription

[Noiile]

resiprocate-devel, Hello 

When client send two unsubscribes(expires=0) with different Cseq, it will make my program crash.
Because it will make DUM delete ServerSubscription's Dialog object twice. 

When ServerSubscription receives a unsubscribe ,it will delete itself, and post a message(DestroyUsage) to delete its Dialog object.
But Dum receives the second unsubscirbe, which call-id is the same as previous, and Cseq is larger than it. 
Dum will create a new ServerSubscription with previous ServerSubscription's dialog , because of the same dialog ID. (Two ServerSubscription share one Dialog object!!!)
And then the 2nd ServerSubscription process this unsubscribe message, it will delete itself, and post a message(DestroyUsage) to delete it's Dialog object.
Now, there are 2 DestroyUsage messages in DUM's fifo, so DUM will delete this Dialog object twice!!!

I have no ideas to fix it :(

Noiile, noiile at hotmail.com
2005-12-8 
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