Check bank capitalization (#11927)

* Check bank capitalization

* Simplify and unify capitalization calculation

* Improve and add tests

* Avoid overflow and inhibit automatic restart

* Fix test

* Tweak checked sum for cap. and add tests

* Fix broken build after merge conflicts..

* Rename to ClusterType

* Rename confusing method

* Clarify comment

* Verify cap. in rent and inflation tests

Co-authored-by: Stephen Akridge <sakridge@gmail.com>

ledger/src/blockstore_processor.rs

@@ -293,6 +293,9 @@ pub enum BlockstoreProcessorError {
 
     #[error("invalid hard fork")]
     InvalidHardFork(Slot),
+
+    #[error("root bank with mismatched capitalization at {0}")]
+    RootBankWithMismatchedCapitalization(Slot),
 }
 
 /// Callback for accessing bank state while processing the blockstore
@@ -481,6 +484,13 @@ fn do_process_blockstore_from_root(
     );
     assert!(bank_forks.active_banks().is_empty());
 
+    // We might be promptly restarted after bad capitalization was detected while creating newer snapshot.
+    // In that case, we're most likely restored from the last good snapshot and replayed up to this root.
+    // So again check here for the bad capitalization to avoid to continue until the next snapshot creation.
+    if !bank_forks.root_bank().calculate_and_verify_capitalization() {
+        return Err(BlockstoreProcessorError::RootBankWithMismatchedCapitalization(root));
+    }
+
     Ok((bank_forks, leader_schedule_cache))
 }