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.

CCoins coins;
            if (!viewMemPool.GetCoins(txin.prevout.hash, coins)) {
                return error("%s: Missing input", __func__);
            }
            if (coins.nHeight == MEMPOOL_HEIGHT) {
                
                prevheights[txinIndex] = tip->nHeight + 1;
            } else {
                prevheights[txinIndex] = coins.nHeight;
            }
        }
        lockPair = CalculateSequenceLocks(tx, flags, &prevheights, index);
        if (lp) {
            lp->height = lockPair.first;
            lp->time = lockPair.second;
            
            
            
            
            
            
            
            
            
            
            
            
            
            int maxInputHeight = 0;
            BOOST_FOREACH(int height, prevheights) {