As segwit is active on testnet, blocks will only be downloaded from NODE_WITNESS peers. Though, exactly those peers are disconnected after `BLOCK_STALLING_TIMEOUT = 2` seconds. I am running master (6e6ab2c)

This behavior is consistent across restarts. Sample [debug.log](http://pastebin.ubuntu.com/23058327/) and [getchaintips](http://pastebin.ubuntu.com/23058325/).

It is possible that I shot my own foot at some point, but it seemed smelly enough to create an issue.

list<CTransaction> removed;
            CValidationState stateDummy;
            if (tx.IsCoinBase() || !AcceptToMemoryPool(mempool, stateDummy, tx, false, NULL, true)) {
                mempool.removeRecursive(tx, removed);
            } else if (mempool.exists(tx.GetHash())) {
                vHashUpdate.push_back(tx.GetHash());
            }
        }
        
        
        
        
        
        mempool.UpdateTransactionsFromBlock(vHashUpdate);
    }
    
    UpdateTip(pindexDelete->pprev, chainparams);
    
    
    BOOST_FOREACH(const CTransaction &tx, block.vtx) {