Current bitcoin-master on testnet, `maxconnections=8` in the config file. Running in VM that doesn't have public IP and is not reachable from the Internet.

Wait until you have 8 peers.

```
telnet localhost 18333
```

It will result in:

```
Assertion failed: (nMaxInbound > 0), function AcceptConnection, file net.cpp, line 973.
```

First found in https://github.com/bitcoin/bitcoin/pull/8996, but can be reproduced on master.

{
    nBestHeight.store(height, std::memory_order_release);
}
int CConnman::GetBestHeight() const
{
    return nBestHeight.load(std::memory_order_acquire);
}
void CNode::Fuzz(int nChance)
{
    if (!fSuccessfullyConnected) return; 
    if (GetRand(nChance) != 0) return; 
    switch (GetRand(3))
    {
    case 0:
        
        if (!ssSend.empty()) {
            CDataStream::size_type pos = GetRand(ssSend.size());
            ssSend[pos] ^= (unsigned char)(GetRand(256));
        }
        break;
    case 1:
        
        if (!ssSend.empty()) {
            CDataStream::size_type pos = GetRand(ssSend.size());
            ssSend.erase(ssSend.begin()+pos);
        }
        break;
    case 2: