init.cpp:1635 prints mapBlockIndex.size() without cs_main. This is technically a race (though it is rather inconsequential). At some point someone should fix this so tsan stops complaining.
{
    const CChainParams& chainParams = Params();
    
    static std::atomic<bool> latchToFalse{false};
    
    if (latchToFalse.load(std::memory_order_relaxed))
        return false;
    LOCK(cs_main);
    if (latchToFalse.load(std::memory_order_relaxed))
        return false;
    if (fImporting || fReindex)
        return true;
    if (chainActive.Tip() == nullptr)
        return true;
    if (chainActive.Tip()->nChainWork < UintToArith256(chainParams.GetConsensus().nMinimumChainWork))
        return true;
    if (chainActive.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge))
        return true;
    LogPrintf("Leaving InitialBlockDownload (latching to false)\n");
    latchToFalse.store(true, std::memory_order_relaxed);
    return false;
}
CBlockIndex *pindexBestForkTip = nullptr, *pindexBestForkBase = nullptr;
static void AlertNotify(const std::string& strMessage)