Merge pull request #6650

0fd6cce blockchain: fix timestamp/difficulty cache getting out of sync (moneromooo-monero)

src/cryptonote_core/blockchain.cpp

@@ -86,7 +86,7 @@ DISABLE_VS_WARNINGS(4267)
 
 //------------------------------------------------------------------
 Blockchain::Blockchain(tx_memory_pool& tx_pool) :
-  m_db(), m_tx_pool(tx_pool), m_hardfork(NULL), m_timestamps_and_difficulties_height(0), m_current_block_cumul_weight_limit(0), m_current_block_cumul_weight_median(0),
+  m_db(), m_tx_pool(tx_pool), m_hardfork(NULL), m_timestamps_and_difficulties_height(0), m_reset_timestamps_and_difficulties_height(true), m_current_block_cumul_weight_limit(0), m_current_block_cumul_weight_median(0),
   m_enforce_dns_checkpoints(false), m_max_prepare_blocks_threads(4), m_db_sync_on_blocks(true), m_db_sync_threshold(1), m_db_sync_mode(db_async), m_db_default_sync(false), m_fast_sync(true), m_show_time_stats(false), m_sync_counter(0), m_bytes_to_sync(0), m_cancel(false),
   m_long_term_block_weights_window(CRYPTONOTE_LONG_TERM_BLOCK_WEIGHT_WINDOW_SIZE),
   m_long_term_effective_median_block_weight(0),
@@ -427,6 +427,7 @@ bool Blockchain::init(BlockchainDB* db, const network_type nettype, bool offline
   if (num_popped_blocks > 0)
   {
     m_timestamps_and_difficulties_height = 0;
+    m_reset_timestamps_and_difficulties_height = true;
     m_hardfork->reorganize_from_chain_height(get_current_blockchain_height());
     uint64_t top_block_height;
     crypto::hash top_block_hash = get_tail_id(top_block_height);
@@ -567,6 +568,7 @@ block Blockchain::pop_block_from_blockchain()
   CRITICAL_REGION_LOCAL(m_blockchain_lock);
 
   m_timestamps_and_difficulties_height = 0;
+  m_reset_timestamps_and_difficulties_height = true;
 
   block popped_block;
   std::vector<transaction> popped_txs;
@@ -644,6 +646,7 @@ bool Blockchain::reset_and_set_genesis_block(const block& b)
   LOG_PRINT_L3("Blockchain::" << __func__);
   CRITICAL_REGION_LOCAL(m_blockchain_lock);
   m_timestamps_and_difficulties_height = 0;
+  m_reset_timestamps_and_difficulties_height = true;
   invalidate_block_template_cache();
   m_db->reset();
   m_db->drop_alt_blocks();
@@ -858,6 +861,8 @@ start:
   //    pop the oldest one from the list. This only requires 1x read per height instead
   //    of doing 735 (DIFFICULTY_BLOCKS_COUNT).
   bool check = false;
+  if (m_reset_timestamps_and_difficulties_height)
+    m_timestamps_and_difficulties_height = 0;
   if (m_timestamps_and_difficulties_height != 0 && ((height - m_timestamps_and_difficulties_height) == 1) && m_timestamps.size() >= DIFFICULTY_BLOCKS_COUNT)
   {
     uint64_t index = height - 1;
@@ -981,6 +986,7 @@ bool Blockchain::rollback_blockchain_switching(std::list<block>& original_chain,
   }
 
   m_timestamps_and_difficulties_height = 0;
+  m_reset_timestamps_and_difficulties_height = true;
 
   // remove blocks from blockchain until we get back to where we should be.
   while (m_db->height() != rollback_height)
@@ -1017,6 +1023,7 @@ bool Blockchain::switch_to_alternative_blockchain(std::list<block_extended_info>
   CRITICAL_REGION_LOCAL(m_blockchain_lock);
 
   m_timestamps_and_difficulties_height = 0;
+  m_reset_timestamps_and_difficulties_height = true;
 
   // if empty alt chain passed (not sure how that could happen), return false
   CHECK_AND_ASSERT_MES(alt_chain.size(), false, "switch_to_alternative_blockchain: empty chain passed");
@@ -1706,6 +1713,7 @@ bool Blockchain::handle_alternative_block(const block& b, const crypto::hash& id
   LOG_PRINT_L3("Blockchain::" << __func__);
   CRITICAL_REGION_LOCAL(m_blockchain_lock);
   m_timestamps_and_difficulties_height = 0;
+  m_reset_timestamps_and_difficulties_height = true;
   uint64_t block_height = get_block_height(b);
   if(0 == block_height)
   {
@@ -4385,7 +4393,14 @@ bool Blockchain::cleanup_handle_incoming_blocks(bool force_sync)
   try
   {
     if (m_batch_success)
+    {
       m_db->batch_stop();
+      if (m_reset_timestamps_and_difficulties_height)
+      {
+        m_timestamps_and_difficulties_height = 0;
+        m_reset_timestamps_and_difficulties_height = false;
+      }
+    }
     else
       m_db->batch_abort();
     success = true;

src/cryptonote_core/blockchain.h

@@ -1067,6 +1067,7 @@ namespace cryptonote
     std::vector<uint64_t> m_timestamps;
     std::vector<difficulty_type> m_difficulties;
     uint64_t m_timestamps_and_difficulties_height;
+    bool m_reset_timestamps_and_difficulties_height;
     uint64_t m_long_term_block_weights_window;
     uint64_t m_long_term_effective_median_block_weight;
     mutable crypto::hash m_long_term_block_weights_cache_tip_hash;