Flush accounts cache before calling clean_accounts() (#19839)

ledger/src/blockstore_processor.rs

@@ -1194,6 +1194,7 @@ fn load_frozen_forks(
                     ) {
                         info!("Taking snapshot of new root bank that has crossed the full snapshot interval! slot: {}", *root);
                         *last_full_snapshot_slot = Some(*root);
+                        new_root_bank.force_flush_accounts_cache();
                         new_root_bank.clean_accounts(true, true, *last_full_snapshot_slot);
                         new_root_bank.update_accounts_hash_with_index_option(
                             snapshot_config.accounts_hash_use_index,

runtime/src/accounts_db.rs

@@ -2009,6 +2009,12 @@ impl AccountsDb {
                 } else {
                     let mut key_set = HashSet::new();
                     key_set.insert(*key);
+                    assert!(
+                        !account_info.is_cached(),
+                        "The Accounts Cache must be flushed first for this account info. pubkey: {}, slot: {}",
+                        *key,
+                        *slot
+                    );
                     let count = self
                         .storage
                         .slot_store_count(*slot, account_info.store_id)