diff --git a/include/stellar/stellar.h b/include/stellar/stellar.h
index 152beb5..7929f25 100644
--- a/include/stellar/stellar.h
+++ b/include/stellar/stellar.h
@@ -60,7 +60,7 @@ void stellar_emit_datapath_telemetry(struct packet *pkt,  const char * module, c
 
 int stellar_get_worker_thread_num(struct stellar *st);
 uint16_t stellar_get_current_thread_index();
-// only send user crafted packet, can't send packet which come from network
+// only send user build packet, can't send packet which come from network
 void stellar_send_build_packet(struct stellar *st, struct packet *pkt);
 
 struct stellar;
diff --git a/infra/CMakeLists.txt b/infra/CMakeLists.txt
index 353a05f..5e4b228 100644
--- a/infra/CMakeLists.txt
+++ b/infra/CMakeLists.txt
@@ -1,4 +1,4 @@
-set(INFRA tuple packet_parser packet_io ip_reassembly tcp_reassembly session_manager plugin_manager core)
+set(INFRA tuple packet_parser packet_io ip_reassembly tcp_reassembly session_manager plugin_manager)
 set(DEPS bitmap dablooms interval_tree logger nmx_pool rbtree timeout toml)
 set(DECODERS http lpi)
 set(WHOLE_ARCHIVE ${DEPS} ${INFRA} ${DECODERS})
@@ -9,13 +9,13 @@ endforeach()
 
 file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/stellar_lib.c "")
 
-add_library(stellar_lib SHARED stellar_lib.c)
+add_library(stellar_lib SHARED stellar_lib.c stellar_core.c stellar_stat.c)
 set_target_properties(stellar_lib PROPERTIES LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/version.map")
 target_link_libraries(stellar_lib PRIVATE pthread -Wl,--whole-archive ${WHOLE_ARCHIVE} -Wl,--no-whole-archive)
 target_link_options(stellar_lib PRIVATE -rdynamic)
 set_target_properties(stellar_lib PROPERTIES OUTPUT_NAME "stellar")
 
-add_executable(stellar main.c)
+add_executable(stellar main.c stellar_core.c stellar_stat.c)
 set_target_properties(stellar PROPERTIES LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/version.map")
 target_link_libraries(stellar PRIVATE pthread -Wl,--whole-archive ${WHOLE_ARCHIVE} -Wl,--no-whole-archive)
 target_link_options(stellar PRIVATE -rdynamic)
diff --git a/infra/core/CMakeLists.txt b/infra/core/CMakeLists.txt
deleted file mode 100644
index 89b5b0f..0000000
--- a/infra/core/CMakeLists.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-
-add_library(core stellar_stat.c stellar_core.c)
-target_link_libraries(core PUBLIC packet_io ip_reassembly plugin_manager)
diff --git a/infra/packet_parser/CMakeLists.txt b/infra/packet_parser/CMakeLists.txt
index a44fab4..f9e4995 100644
--- a/infra/packet_parser/CMakeLists.txt
+++ b/infra/packet_parser/CMakeLists.txt
@@ -9,7 +9,7 @@ target_include_directories(packet_parser PUBLIC ${CMAKE_CURRENT_LIST_DIR})
 target_include_directories(packet_parser PUBLIC ${CMAKE_SOURCE_DIR}/deps/uthash)
 target_include_directories(packet_parser PUBLIC ${CMAKE_SOURCE_DIR}/deps/logger)
 target_include_directories(packet_parser PUBLIC ${CMAKE_SOURCE_DIR}/include)
-target_include_directories(packet_parser PUBLIC ${CMAKE_SOURCE_DIR}/infra/core)
+target_include_directories(packet_parser PUBLIC ${CMAKE_SOURCE_DIR}/infra)
 target_link_libraries(packet_parser tuple logger dablooms)
 
 add_subdirectory(test)
\ No newline at end of file
diff --git a/infra/packet_parser/packet_builder.c b/infra/packet_parser/packet_builder.c
index 64e77d8..fc95a81 100644
--- a/infra/packet_parser/packet_builder.c
+++ b/infra/packet_parser/packet_builder.c
@@ -79,7 +79,7 @@ static void update_gtp1_hdr(struct gtp1_hdr *gtp, int trim_len)
     gtp1_hdr_set_msg_len(gtp, msg_len - trim_len);
     if (gtp1_hdr_get_seq_flag(gtp) && gtp1_hdr_get_seq(gtp))
     {
-        PACKET_CRAFT_LOG_ERROR("crafted packets may be dropped by intermediate devices, the GTPv1 layer requires a sequence number");
+        PACKET_CRAFT_LOG_ERROR("build packets may be dropped by intermediate devices, the GTPv1 layer requires a sequence number");
     }
 }
 
@@ -89,7 +89,7 @@ static void update_gtp2_hdr(struct gtp2_hdr *gtp, int trim_len)
     gtp2_hdr_set_msg_len(gtp, msg_len - trim_len);
     if (gtp2_hdr_get_seq(gtp))
     {
-        PACKET_CRAFT_LOG_ERROR("crafted packets may be dropped by intermediate devices, the GTPv2 layer requires a sequence number");
+        PACKET_CRAFT_LOG_ERROR("build packets may be dropped by intermediate devices, the GTPv2 layer requires a sequence number");
     }
 }
 
diff --git a/infra/plugin_manager/CMakeLists.txt b/infra/plugin_manager/CMakeLists.txt
index 742a069..4c0fd90 100644
--- a/infra/plugin_manager/CMakeLists.txt
+++ b/infra/plugin_manager/CMakeLists.txt
@@ -1,7 +1,7 @@
 add_library(plugin_manager plugin_manager.c)
 target_include_directories(plugin_manager PUBLIC ${CMAKE_CURRENT_LIST_DIR})
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/include/)
-target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/core)
+target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/)
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/packet_parser)
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/session_manager)
 target_include_directories(plugin_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/tuple)
diff --git a/infra/session_manager/CMakeLists.txt b/infra/session_manager/CMakeLists.txt
index 74cc479..2df7c74 100644
--- a/infra/session_manager/CMakeLists.txt
+++ b/infra/session_manager/CMakeLists.txt
@@ -8,7 +8,7 @@ add_library(session_manager
     session_transition.c
 )
 target_include_directories(session_manager PUBLIC ${CMAKE_CURRENT_LIST_DIR})
-target_include_directories(session_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/core)
+target_include_directories(session_manager PUBLIC ${CMAKE_SOURCE_DIR}/infra/)
 target_include_directories(session_manager PUBLIC ${CMAKE_SOURCE_DIR}/include)
 target_link_libraries(session_manager timeout packet_parser tcp_reassembly)
 
diff --git a/infra/core/stellar_core.c b/infra/stellar_core.c
similarity index 92%
rename from infra/core/stellar_core.c
rename to infra/stellar_core.c
index 197225a..246c495 100644
--- a/infra/core/stellar_core.c
+++ b/infra/stellar_core.c
@@ -319,6 +319,7 @@ static int stellar_thread_init(struct stellar *st)
         struct stellar_thread *thread = &runtime->threads[i];
         thread->idx = i;
         thread->is_runing = 0;
+        thread->st = st;
 
         config->sess_mgr_cfg->session_id_seed = config->instance_id << 8 | i;
         thread->sess_mgr = session_manager_new(config->sess_mgr_cfg, now_ms);
@@ -334,30 +335,11 @@ static int stellar_thread_init(struct stellar *st)
             CORE_LOG_ERROR("unable to create ip reassemble manager");
             return -1;
         }
-        thread->st = st;
     }
 
     return 0;
 }
 
-static void stellar_thread_clean(struct stellar *st)
-{
-    struct stellar_runtime *runtime = &st->runtime;
-    struct stellar_config *config = &st->config;
-
-    CORE_LOG_FATAL("cleaning worker thread context ...");
-    for (uint16_t i = 0; i < config->pkt_io_cfg->nr_worker_thread; i++)
-    {
-        struct stellar_thread *thread = &runtime->threads[i];
-        if (ATOMIC_READ(&thread->is_runing) == 0)
-        {
-            ip_reassembly_free(thread->ip_reass);
-            session_manager_free(thread->sess_mgr);
-        }
-    }
-    CORE_LOG_FATAL("worker thread context cleaned");
-}
-
 static int stellar_thread_run(struct stellar *st)
 {
     struct stellar_runtime *runtime = &st->runtime;
@@ -381,16 +363,16 @@ static void stellar_thread_join(struct stellar *st)
     struct stellar_runtime *runtime = &st->runtime;
     struct stellar_config *config = &st->config;
 
-    CORE_LOG_FATAL("waiting worker thread stop ...");
+    CORE_LOG_FATAL("waiting worker thread exit");
     for (uint16_t i = 0; i < config->pkt_io_cfg->nr_worker_thread; i++)
     {
         struct stellar_thread *thread = &runtime->threads[i];
-        while (ATOMIC_READ(&thread->is_runing) == 1)
-        {
-            usleep(1000); // 1ms
-        }
+        pthread_join(thread->tid, NULL);
+
+        ip_reassembly_free(thread->ip_reass);
+        session_manager_free(thread->sess_mgr);
     }
-    CORE_LOG_FATAL("all worker thread stoped");
+    CORE_LOG_FATAL("all worker thread exited");
 }
 
 struct stellar *stellar_new(const char *stellar_cfg_file, const char *plugin_cfg_file, const char *log_cfg_file)
@@ -429,9 +411,7 @@ struct stellar *stellar_new(const char *stellar_cfg_file, const char *plugin_cfg
     }
     __thread_local_logger = runtime->logger;
     CORE_LOG_FATAL("stellar start (version: %s)\n %s", version, logo_str);
-    CORE_LOG_FATAL("stellar config file : %s", stellar_cfg_file);
-    CORE_LOG_FATAL("plugin  config file : %s", plugin_cfg_file);
-    CORE_LOG_FATAL("log     config file : %s", log_cfg_file);
+    CORE_LOG_FATAL("stellar config file: %s, plugin config file: %s, log config file: %s", stellar_cfg_file, plugin_cfg_file, log_cfg_file);
 
     if (load_and_validate_toml_integer_config(stellar_cfg_file, "instance.id", (uint64_t *)&config->instance_id, 0, 4095) != 0)
     {
@@ -463,11 +443,10 @@ struct stellar *stellar_new(const char *stellar_cfg_file, const char *plugin_cfg
         CORE_LOG_ERROR("unable to create stellar stat config");
         goto error_out;
     }
-
-    session_manager_config_print(config->sess_mgr_cfg);
-    ip_reassembly_config_print(config->ip_reass_cfg);
-    packet_io_config_print(config->pkt_io_cfg);
     stellar_stat_config_print(config->stat_cfg);
+    packet_io_config_print(config->pkt_io_cfg);
+    ip_reassembly_config_print(config->ip_reass_cfg);
+    session_manager_config_print(config->sess_mgr_cfg);
 
     runtime->stat = stellar_stat_new(config->stat_cfg, clock_get_real_time_ms());
     if (runtime->stat == NULL)
@@ -544,7 +523,6 @@ void stellar_run(struct stellar *st)
     }
 
     stellar_thread_join(st);
-    stellar_stat_output(runtime->stat, UINT64_MAX);
 }
 
 void stellar_free(struct stellar *st)
@@ -554,7 +532,6 @@ void stellar_free(struct stellar *st)
         struct stellar_runtime *runtime = &st->runtime;
         struct stellar_config *config = &st->config;
 
-        stellar_thread_clean(st);
         packet_io_free(runtime->packet_io);
         plugin_manager_exit(runtime->plug_mgr);
         stellar_stat_free(runtime->stat);
@@ -593,11 +570,6 @@ void stellar_reload_log_level(struct stellar *st)
  * Stellar Utility Function
  ******************************************************************************/
 
-struct packet_io *stellar_get_packet_io(const struct stellar *st)
-{
-    return st->runtime.packet_io;
-}
-
 struct plugin_manager_schema *stellar_get_plugin_manager(const struct stellar *st)
 {
     return st->runtime.plug_mgr;
@@ -608,32 +580,12 @@ void stellar_set_plugin_manger(struct stellar *st, struct plugin_manager_schema
     st->runtime.plug_mgr = plug_mgr;
 }
 
-struct session_manager *stellar_get_session_manager(const struct stellar *st)
-{
-    uint16_t idx = stellar_get_current_thread_index();
-    return st->runtime.threads[idx].sess_mgr;
-}
-
-uint16_t stellar_get_current_thread_index()
-{
-    if (__current_thread_idx == UINT16_MAX)
-    {
-        printf("get current thread index before set\n");
-        abort();
-        return UINT16_MAX;
-    }
-    else
-    {
-        return __current_thread_idx;
-    }
-}
-
-// only send user crafted packet, can't send packet which come from network
+// only send user build packet, can't send packet which come from network
 void stellar_send_build_packet(struct stellar *st, struct packet *pkt)
 {
     uint16_t thr_idx = stellar_get_current_thread_index();
-    struct packet_io *packet_io = stellar_get_packet_io(st);
-    struct session_manager *sess_mgr = stellar_get_session_manager(st);
+    struct packet_io *packet_io = st->runtime.packet_io;
+    struct session_manager *sess_mgr = st->runtime.threads[thr_idx].sess_mgr;
     session_manager_record_duplicated_packet(sess_mgr, pkt);
 
     if (packet_get_origin_ctx(pkt))
@@ -653,6 +605,20 @@ int stellar_get_worker_thread_num(struct stellar *st)
     return st->config.pkt_io_cfg->nr_worker_thread;
 }
 
+uint16_t stellar_get_current_thread_index()
+{
+    if (__current_thread_idx == UINT16_MAX)
+    {
+        printf("get current thread index before set\n");
+        abort();
+        return UINT16_MAX;
+    }
+    else
+    {
+        return __current_thread_idx;
+    }
+}
+
 struct logger *stellar_get_logger(struct stellar *st)
 {
     if (st)
diff --git a/infra/core/stellar_core.h b/infra/stellar_core.h
similarity index 69%
rename from infra/core/stellar_core.h
rename to infra/stellar_core.h
index 1c92167..c460d78 100644
--- a/infra/core/stellar_core.h
+++ b/infra/stellar_core.h
@@ -7,14 +7,10 @@ extern "C"
 
 #include "stellar/stellar.h"
 
-struct packet_io *stellar_get_packet_io(const struct stellar *st);
-struct session_manager *stellar_get_session_manager(const struct stellar *st);
-struct plugin_manager_schema *stellar_get_plugin_manager(const struct stellar *st);
 // TODO fix plugin manager, delete this function
+struct plugin_manager_schema *stellar_get_plugin_manager(const struct stellar *st);
 void stellar_set_plugin_manger(struct stellar *st, struct plugin_manager_schema *plug_mgr);
 
-
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/infra/core/stellar_stat.c b/infra/stellar_stat.c
similarity index 100%
rename from infra/core/stellar_stat.c
rename to infra/stellar_stat.c
diff --git a/infra/core/stellar_stat.h b/infra/stellar_stat.h
similarity index 100%
rename from infra/core/stellar_stat.h
rename to infra/stellar_stat.h
diff --git a/infra/core/utils.h b/infra/utils.h
similarity index 100%
rename from infra/core/utils.h
rename to infra/utils.h
diff --git a/test/debug_plugin/CMakeLists.txt b/test/debug_plugin/CMakeLists.txt
index bfcc4ca..38be076 100644
--- a/test/debug_plugin/CMakeLists.txt
+++ b/test/debug_plugin/CMakeLists.txt
@@ -2,7 +2,7 @@
 add_library(debug_plugin SHARED debug_plugin.c)
 target_link_libraries(debug_plugin stellar_lib session_manager packet_parser)
 target_include_directories(debug_plugin PUBLIC ${CMAKE_SOURCE_DIR}/include/)
-target_include_directories(debug_plugin PUBLIC ${CMAKE_SOURCE_DIR}/infra/core/utils)
+target_include_directories(debug_plugin PUBLIC ${CMAKE_SOURCE_DIR}/infra)
 set_target_properties(debug_plugin PROPERTIES LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/version.map")
 
 file(COPY ./conf/ DESTINATION ./conf/)
\ No newline at end of file