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.

typedef std::map<uint256, std::shared_ptr<const CTransaction>> MapRelay;
    MapRelay mapRelay;
    
    std::deque<std::pair<int64_t, MapRelay::iterator>> vRelayExpiration;
} 
namespace {
struct CBlockReject {
    unsigned char chRejectCode;
    string strRejectReason;
    uint256 hashBlock;
};
/**
 * Maintain validation-specific state about nodes, protected by cs_main, instead
 * by CNode's own locks. This simplifies asynchronous operation, where
 * processing of incoming data is done after the ProcessMessage call returns,
 * and we're no longer holding the node's locks.
 */
struct CNodeState {
    
    CService address;
    
    bool fCurrentlyConnected;
    
    int nMisbehavior;
    
    bool fShouldBan;
    
    std::string name;
    
    std::vector<CBlockReject> rejects;