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.
int64_t nMempoolUsage = mempool.DynamicMemoryUsage();
    LOCK(cs_main);
    static int64_t nLastWrite = 0;
    static int64_t nLastFlush = 0;
    static int64_t nLastSetChain = 0;
    std::set<int> setFilesToPrune;
    bool fFlushForPrune = false;
    bool fDoFullFlush = false;
    int64_t nNow = 0;
    try {
    {
        LOCK(cs_LastBlockFile);
        if (fPruneMode && (fCheckForPruning || nManualPruneHeight > 0) && !fReindex) {
            if (nManualPruneHeight > 0) {
                FindFilesToPruneManual(setFilesToPrune, nManualPruneHeight);
            } else {
                FindFilesToPrune(setFilesToPrune, chainparams.PruneAfterHeight());