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.

if (nLocalServices & NODE_WITNESS) {
        
        return;
    }
    if (nodestate->fProvidesHeaderAndIDs) {
        BOOST_FOREACH(const NodeId nodeid, lNodesAnnouncingHeaderAndIDs)
            if (nodeid == pfrom->GetId())
                return;
        bool fAnnounceUsingCMPCTBLOCK = false;
        uint64_t nCMPCTBLOCKVersion = 1;
        if (lNodesAnnouncingHeaderAndIDs.size() >= 3) {
            
            
            CNode* pnodeStop = FindNode(lNodesAnnouncingHeaderAndIDs.front());
            if (pnodeStop) {
                pnodeStop->PushMessage(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion);
                lNodesAnnouncingHeaderAndIDs.pop_front();
            }
        }
        fAnnounceUsingCMPCTBLOCK = true;
        pfrom->PushMessage(NetMsgType::SENDCMPCT, fAnnounceUsingCMPCTBLOCK, nCMPCTBLOCKVersion);
        lNodesAnnouncingHeaderAndIDs.push_back(pfrom->GetId());
    }
}
bool CanDirectFetch(const Consensus::Params &consensusParams)