core: guard against exceptions in handle_incoming_{block,tx}

When one happens, cleanup must be called or the incoming tx
lock will stay locked

src/cryptonote_core/cryptonote_core.cpp

@@ -585,6 +585,8 @@ namespace cryptonote
   //-----------------------------------------------------------------------------------------------
   bool core::handle_incoming_txs(const std::list<blobdata>& tx_blobs, std::vector<tx_verification_context>& tvc, bool keeped_by_block, bool relayed, bool do_not_relay)
   {
+    TRY_ENTRY();
+
     struct result { bool res; cryptonote::transaction tx; crypto::hash hash; crypto::hash prefix_hash; bool in_txpool; bool in_blockchain; };
     std::vector<result> results(tx_blobs.size());
 
@@ -638,6 +640,8 @@ namespace cryptonote
         MDEBUG("tx added: " << results[i].hash);
     }
     return ok;
+
+    CATCH_ENTRY_L0("core::handle_incoming_txs()", false);
   }
   //-----------------------------------------------------------------------------------------------
   bool core::handle_incoming_tx(const blobdata& tx_blob, tx_verification_context& tvc, bool keeped_by_block, bool relayed, bool do_not_relay)
@@ -1075,6 +1079,8 @@ namespace cryptonote
   //-----------------------------------------------------------------------------------------------
   bool core::handle_incoming_block(const blobdata& block_blob, block_verification_context& bvc, bool update_miner_blocktemplate)
   {
+    TRY_ENTRY();
+
     // load json & DNS checkpoints every 10min/hour respectively,
     // and verify them with respect to what blocks we already have
     CHECK_AND_ASSERT_MES(update_checkpoints(), false, "One or more checkpoints loaded from json or dns conflicted with existing checkpoints.");
@@ -1098,6 +1104,8 @@ namespace cryptonote
     if(update_miner_blocktemplate && bvc.m_added_to_main_chain)
        update_miner_block_template();
     return true;
+
+    CATCH_ENTRY_L0("core::handle_incoming_block()", false);
   }
   //-----------------------------------------------------------------------------------------------
   // Used by the RPC server to check the size of an incoming