diff --git a/cmake/Modules/freeminer_src.cmake b/cmake/Modules/freeminer_src.cmake
index 514250ba0..1f7476a02 100644
--- a/cmake/Modules/freeminer_src.cmake
+++ b/cmake/Modules/freeminer_src.cmake
@@ -113,6 +113,9 @@ if(ENABLE_OSMIUM AND (OSMIUM_INCLUDE_DIR OR EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/m
         set(BUILD_DATA_TESTS 0 CACHE INTERNAL "")
         set(BUILD_EXAMPLES 0 CACHE INTERNAL "")
         set(BUILD_BENCHMARKS 0 CACHE INTERNAL "")
+        set(Osmium_USE_GEOS 0 CACHE INTERNAL "")
+        set(Osmium_USE_GDAL 0 CACHE INTERNAL "")
+        set(CPPCHECK 0 CACHE INTERNAL "")
 
         if(NOT OSMIUM_INCLUDE_DIR)
             add_subdirectory(mapgen/earth/libosmium)
diff --git a/src/fm_server.cpp b/src/fm_server.cpp
index 7f6973a1f..ac78c0211 100644
--- a/src/fm_server.cpp
+++ b/src/fm_server.cpp
@@ -695,7 +695,7 @@ void Server::SendBlockFm(session_t peer_id, MapBlockPtr block, u8 ver,
 	PACK(TOCLIENT_BLOCKDATA_POS, block->getPos());
 
 	std::ostringstream os(std::ios_base::binary);
-	block->serialize(os, ver, false, net_compression_level, net_proto_version >= 1);
+	block->serialize(os, ver, false, net_compression_level);
 	block->serializeNetworkSpecific(os);
 
 	PACK(TOCLIENT_BLOCKDATA_DATA, os.str());
diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index 27298dd1b..971bac05a 100644
--- a/src/mapblock.cpp
+++ b/src/mapblock.cpp
@@ -594,7 +594,7 @@ void MapBlock::correctBlockNodeIds(const NameIdMapping *nimap, MapNode *nodes,
 	}
 }
 
-void MapBlock::serialize(std::ostream &os_compressed, u8 version, bool disk, int compression_level, bool use_content_only)
+void MapBlock::serialize(std::ostream &os_compressed, u8 version, bool disk, int compression_level)
 {
 	if (!ser_ver_supported_write(version))
 		throw VersionMismatchException("ERROR: MapBlock format not supported");
@@ -630,10 +630,6 @@ void MapBlock::serialize(std::ostream &os_compressed, u8 version, bool disk, int
 		writeU16(os, m_lighting_complete);
 	}
 
-	// fmtodo: check version and dont pack data if more than 20150427 or 0.4.12.7+
-//	if (!disk && use_content_only && m_is_mono_block)
-//		return;
-
 	/*
 		Bulk node data
 	*/
@@ -797,15 +793,6 @@ bool MapBlock::deSerialize(std::istream &in_compressed, u8 version, bool disk)
 		}
 	}
 
-/*
-	if (!disk && m_is_mono_block) {
-		auto n = MapNode(content_only, content_only_param1, content_only_param2);
-		for (u32 i = 0; i < MAP_BLOCKSIZE*MAP_BLOCKSIZE*MAP_BLOCKSIZE; i++)
-			data[i] = n;
-		return true;
-	}
-*/
-
 	TRACESTREAM(<<"MapBlock::deSerialize "<<getPos()
 			<<": Bulk node data"<<std::endl);
 	u8 content_width = readU8(is);
@@ -909,15 +896,23 @@ bool MapBlock::deSerialize(std::istream &in_compressed, u8 version, bool disk)
 	}
 
 	if (flags & (1 << 7)) {
+		size_t size = 0;
 		std::string data = deSerializeString32(is);
+		size = data.size();
 		if (!data.empty()) {
 			msgpack::unpacked msg;
 			msgpack::unpack(msg, data.data(), data.size());
-			auto &obj = msg.get();
-			auto packet = obj.as<MsgpackPacket>();
+			auto packet = msg.get().as<MsgpackPacket>();
 			const auto it = packet.find(MAPBLOCK_LIGHT_POINTS);
 			if (it != packet.end()) {
-				it->second.convert(m_light_points);
+				try {
+					it->second.convert(m_light_points);
+				} catch (const std::exception &ex) {
+					verbosestream << "MapBlock::deSerialize freeminer: pos=" << getPos()
+								  << " size=" << data.size()
+								  << " packet=" << packet.size() << " ex=" << ex.what()
+								  << std::endl;
+				}
 			}
 		}
 	}
diff --git a/src/mapblock.h b/src/mapblock.h
index c47874998..a2123a949 100644
--- a/src/mapblock.h
+++ b/src/mapblock.h
@@ -456,7 +456,7 @@ public:
 	// These don't write or read version by itself
 	// Set disk to true for on-disk format, false for over-the-network format
 	// Precondition: version >= SER_FMT_VER_LOWEST_WRITE
-	void serialize(std::ostream &result, u8 version, bool disk, int compression_level, bool use_content_only = false);
+	void serialize(std::ostream &result, u8 version, bool disk, int compression_level);
 	// If disk == true: In addition to doing other things, will add
 	// unknown blocks from id-name mapping to wndef
 	bool deSerialize(std::istream &is, u8 version, bool disk);
diff --git a/src/server.cpp b/src/server.cpp
index dbdf0b9d4..ec4d1268b 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -690,9 +690,14 @@ void Server::start()
 		std::cerr << "  ___ " << g_version_hash << std::endl;
 	}
 
-
    actionstream << "\033[1mfree\033[1;33mminer \033[1;36mv" << g_version_hash
 				<< "\033[0m \t"
+#if USE_POS32
+				<< " map" << USE_POS32 << " \t"
+#endif
+#if USE_OPOS32
+				<< " obj" << USE_OPOS64 << " \t"
+#endif
 #if ENABLE_THREADS
 				<< " threads \t"
 #endif
@@ -717,12 +722,17 @@ void Server::start()
 				<< " msan \t"
 #endif
 #endif
+#if defined(__has_feature)
+#if __has_feature(undefined_behavior_sanitizer)
+				<< " ubsan \t"
+#endif
+#endif
 #if USE_MULTI
 				<< " multi: \t"
 #endif
 #if MINETEST_PROTO && MINETEST_TRANSPORT
-				<< " mt " << SERVER_PROTOCOL_VERSION_MIN << "-"
-				<< LATEST_PROTOCOL_VERSION << "\t"
+				<< " mt " << SERVER_PROTOCOL_VERSION_MIN << "-" << LATEST_PROTOCOL_VERSION
+				<< "\t"
 #endif
 #if USE_SCTP
 				<< " sctp \t"
@@ -750,12 +760,12 @@ void Server::start()
 #endif
 				<< std::endl;
 
-	actionstream << "World at [" << m_path_world << "]" << std::endl;
-	actionstream << "Server for gameid=\"" << m_gamespec.id
-			<< "\" mapgen=\"" << Mapgen::getMapgenName(m_emerge->mgparams->mgtype)
-			<< "\" listening on ";
-	m_bind_addr.print(actionstream);
-	actionstream << "." << std::endl;
+   actionstream << "World at [" << m_path_world << "]" << std::endl;
+   actionstream << "Server for gameid=\"" << m_gamespec.id << "\" mapgen=\""
+				<< Mapgen::getMapgenName(m_emerge->mgparams->mgtype)
+				<< "\" listening on ";
+   m_bind_addr.print(actionstream);
+   actionstream << "." << std::endl;
 }
 
 void Server::stop()