Solitary Ack error loop when controller abandons BDX log download

[ksperling-apple]

I have observed a number of instances where abandonment of a BDX log download by the controller causes the device app to go into a "loop" of attempting to send a solitary ACK. I don't think it reproduces 100% of the time though.

bdx-shutdown-server-loop.txt

[bzbarsky-apple]

So this is a case where the session is gone for some reason?

This looks a lot like #16805.... but maybe now we have a clearer way to see what's going on there!

[ksperling-apple]

Hm yeah maybe it's the same issue. This happened when I stopped the controller side, does that close the session somehow?

[bzbarsky-apple]

I would not expect it to, generally..... At least not given our current code; we do not send CloseSession (though it would be nice if we did).