`LockAnnotation lock(::cs_main)` is a guarantee to the compiler thread analysis that `::cs_main` is locked (when it couldn't be determined otherwise).

Despite being annotated with the locking guarantee ...

https://github.com/bitcoin/bitcoin/blob/65526fc8666fef35ef908dbc225f706bef642c7e/src/interfaces/chain.cpp#L134-L138

... `getTipLocator()` reads `chainActive` (via `::ChainActive()`) without holding `cs_main`.

This can be verified by adding the following `AssertLockHeld(cs_main)`:

```
$ git diff
diff --git a/src/interfaces/chain.cpp b/src/interfaces/chain.cpp
index 59623284d..9fc693a0f 100644
--- a/src/interfaces/chain.cpp
+++ b/src/interfaces/chain.cpp
@@ -134,6 +134,7 @@ class LockImpl : public Chain::Lock
     CBlockLocator getTipLocator() override
     {
         LockAnnotation lock(::cs_main);
+        AssertLockHeld(::cs_main);
         return ::ChainActive().GetLocator();
     }
     Optional<int> findLocatorFork(const CBlockLocator& locator) override
$ make check
../build-aux/test-driver: line 107: 12881 Aborted                 "$@" > $log_file 2>&1
FAIL: qt/test/test_bitcoin-qt
```
{
    LOCK(cs_wallets);
    for (const std::shared_ptr<CWallet>& wallet : vpwallets) {
        if (wallet->GetName() == name) return wallet;
    }
    return nullptr;
}
static Mutex g_wallet_release_mutex;
static std::condition_variable g_wallet_release_cv;
static std::set<CWallet*> g_unloading_wallet_set;
static void ReleaseWallet(CWallet* wallet)
{
    
    
    wallet->WalletLogPrintf("Releasing wallet\n");
    wallet->BlockUntilSyncedToCurrentChain();
    wallet->Flush();
    wallet->m_chain_notifications_handler.reset();
    delete wallet;
    
    {
        LOCK(g_wallet_release_mutex);
        if (g_unloading_wallet_set.erase(wallet) == 0) {
            
            return;
        }
    }
    g_wallet_release_cv.notify_all();
}
void UnloadWallet(std::shared_ptr<CWallet>&& wallet)