Fix blockchain_import wedge on exception in cleanup_handle_incoming_blocks

src/blockchain_db/lmdb/db_lmdb.cpp

@@ -2604,6 +2604,16 @@ void BlockchainLMDB::batch_commit()
   memset(&m_wcursors, 0, sizeof(m_wcursors));
 }
 
+void BlockchainLMDB::cleanup_batch()
+{
+  // for destruction of batch transaction
+  m_write_txn = nullptr;
+  delete m_write_batch_txn;
+  m_write_batch_txn = nullptr;
+  m_batch_active = false;
+  memset(&m_wcursors, 0, sizeof(m_wcursors));
+}
+
 void BlockchainLMDB::batch_stop()
 {
   LOG_PRINT_L3("BlockchainLMDB::" << __func__);
@@ -2618,15 +2628,18 @@ void BlockchainLMDB::batch_stop()
   check_open();
   LOG_PRINT_L3("batch transaction: committing...");
   TIME_MEASURE_START(time1);
-  m_write_txn->commit();
-  TIME_MEASURE_FINISH(time1);
-  time_commit1 += time1;
-  // for destruction of batch transaction
-  m_write_txn = nullptr;
-  delete m_write_batch_txn;
-  m_write_batch_txn = nullptr;
-  m_batch_active = false;
-  memset(&m_wcursors, 0, sizeof(m_wcursors));
+  try
+  {
+    m_write_txn->commit();
+    TIME_MEASURE_FINISH(time1);
+    time_commit1 += time1;
+    cleanup_batch();
+  }
+  catch (const std::exception &e)
+  {
+    cleanup_batch();
+    throw;
+  }
   LOG_PRINT_L3("batch transaction: end");
 }
 

src/blockchain_db/lmdb/db_lmdb.h

@@ -368,6 +368,9 @@ private:
   // migrate from DB version 0 to 1
   void migrate_0_1();
 
+  void cleanup_batch();
+
+private:
   MDB_env* m_env;
 
   MDB_dbi m_blocks;

src/blockchain_utilities/blockchain_import.cpp

@@ -208,7 +208,8 @@ int check_flush(cryptonote::core &core, std::list<block_complete_entry> &blocks,
     }
 
   } // each download block
-  core.cleanup_handle_incoming_blocks();
+  if (!core.cleanup_handle_incoming_blocks())
+    return 1;
 
   blocks.clear();
   return 0;
@@ -394,7 +395,10 @@ int import_from_file(cryptonote::core& core, const std::string& import_file_path
           blocks.push_back({block, txs});
           int ret = check_flush(core, blocks, false);
           if (ret)
+          {
+            quit = 2; // make sure we don't commit partial block data
             break;
+          }
         }
         else
         {

src/cryptonote_core/blockchain.cpp

@@ -3582,12 +3582,23 @@ void Blockchain::block_longhash_worker(uint64_t height, const std::vector<block>
 //------------------------------------------------------------------
 bool Blockchain::cleanup_handle_incoming_blocks(bool force_sync)
 {
+  bool success = false;
+
   MTRACE("Blockchain::" << __func__);
   CRITICAL_REGION_BEGIN(m_blockchain_lock);
   TIME_MEASURE_START(t1);
 
-  m_db->batch_stop();
-  if (m_sync_counter > 0)
+  try
+  {
+    m_db->batch_stop();
+    success = true;
+  }
+  catch (const std::exception &e)
+  {
+    MERROR("Exception in cleanup_handle_incoming_blocks: " << e.what());
+  }
+
+  if (success && m_sync_counter > 0)
   {
     if (force_sync)
     {
@@ -3622,7 +3633,7 @@ bool Blockchain::cleanup_handle_incoming_blocks(bool force_sync)
   CRITICAL_REGION_END();
   m_tx_pool.unlock();
 
-  return true;
+  return success;
 }
 
 //------------------------------------------------------------------

src/cryptonote_core/cryptonote_core.cpp

@@ -1068,12 +1068,13 @@ namespace cryptonote
   //-----------------------------------------------------------------------------------------------
   bool core::cleanup_handle_incoming_blocks(bool force_sync)
   {
+    bool success = false;
     try {
-      m_blockchain_storage.cleanup_handle_incoming_blocks(force_sync);
+      success = m_blockchain_storage.cleanup_handle_incoming_blocks(force_sync);
     }
     catch (...) {}
     m_incoming_tx_lock.unlock();
-    return true;
+    return success;
   }
 
   //-----------------------------------------------------------------------------------------------