diff --git a/conf/stellar.toml b/conf/stellar.toml
index b71d869..d7d1a01 100644
--- a/conf/stellar.toml
+++ b/conf/stellar.toml
@@ -81,4 +81,4 @@ exit = "packet_manager_on_exit"
 [[module]]
 path = ""
 init = "session_manager_on_init"
-exit = "session_manager_on_exit"
\ No newline at end of file
+exit = "session_manager_on_exit"
diff --git a/infra/packet_io/packet_io.c b/infra/packet_io/packet_io.c
index 897f2c9..68b4f12 100644
--- a/infra/packet_io/packet_io.c
+++ b/infra/packet_io/packet_io.c
@@ -228,7 +228,7 @@ static void packet_io_config_print(const struct packet_io_config *cfg)
         PACKET_IO_LOG_INFO("packet_io.nr_worker_thread       : %d", cfg->nr_worker_thread);
         for (uint16_t i = 0; i < cfg->nr_worker_thread; i++)
         {
-            PACKET_IO_LOG_INFO("packet_io.cpu_mask[%03d]        : %d", i, cfg->cpu_mask[i]);
+            PACKET_IO_LOG_INFO("packet_io.cpu_mask[%03d]          : %d", i, cfg->cpu_mask[i]);
         }
         PACKET_IO_LOG_INFO("packet_io.idle_yield_interval_ms : %lu", cfg->idle_yield_interval_ms);
     }
diff --git a/infra/packet_manager/packet_manager.c b/infra/packet_manager/packet_manager.c
index d9e5305..7e903a6 100644
--- a/infra/packet_manager/packet_manager.c
+++ b/infra/packet_manager/packet_manager.c
@@ -9,7 +9,7 @@
 
 #define PACKET_MANAGER_LOG_ERROR(format, ...) STELLAR_LOG_ERROR(__thread_local_logger, "packet manager", format, ##__VA_ARGS__)
 #define PACKET_MANAGER_LOG_DEBUG(format, ...) STELLAR_LOG_DEBUG(__thread_local_logger, "packet manager", format, ##__VA_ARGS__)
-#define PACKET_MANAGER_LOG_INFO(format, ...) STELLAR_LOG_WARN(__thread_local_logger, "packet manager", format, ##__VA_ARGS__)
+#define PACKET_MANAGER_LOG_FATAL(format, ...) STELLAR_LOG_FATAL(__thread_local_logger, "packet manager", format, ##__VA_ARGS__)
 
 TAILQ_HEAD(packet_queue, packet);
 
@@ -468,7 +468,7 @@ struct stellar_module *packet_manager_on_init(struct stellar_module_manager *mod
     }
     stellar_module_set_ctx(pkt_mgr_mod, pkt_mgr);
 
-    PACKET_MANAGER_LOG_INFO("packet_manager initialized");
+    PACKET_MANAGER_LOG_FATAL("packet_manager initialized");
     return pkt_mgr_mod;
 }
 
@@ -480,6 +480,6 @@ void packet_manager_on_exit(struct stellar_module_manager *mod_mgr __attribute__
 
         packet_manager_free(pkt_mgr);
         stellar_module_free(mod);
-        PACKET_MANAGER_LOG_INFO("packet_manager exited");
+        PACKET_MANAGER_LOG_FATAL("packet_manager exited");
     }
 }
\ No newline at end of file
diff --git a/infra/session_manager/session_manager.c b/infra/session_manager/session_manager.c
index b4a7b17..d150dc9 100644
--- a/infra/session_manager/session_manager.c
+++ b/infra/session_manager/session_manager.c
@@ -305,6 +305,7 @@ void session_manager_free(struct session_manager *sess_mgr)
                 clean_session(sess_mgr_rt, UINT64_MAX);
             }
 
+            session_manager_runtime_print_stat(sess_mgr_rt);
             session_manager_runtime_free(sess_mgr->runtime[i]);
         }
 
@@ -320,7 +321,7 @@ struct session_manager *session_manager_new(struct stellar_polling_manager *poll
     assert(mq_schema);
     assert(toml_file);
 
-    uint16_t thread_num;
+    uint64_t thread_num;
     uint64_t instance_id;
     uint64_t now_ms = clock_get_real_time_ms();
 
@@ -354,7 +355,7 @@ struct session_manager *session_manager_new(struct stellar_polling_manager *poll
         goto error_out;
     }
 
-    sess_mgr->thread_num = thread_num;
+    sess_mgr->thread_num = (uint16_t)thread_num;
     for (int i = 0; i < sess_mgr->thread_num; i++)
     {
         sess_mgr->cfg->session_id_seed = instance_id << 8 | i;
@@ -448,7 +449,7 @@ struct stellar_module *session_manager_on_init(struct stellar_module_manager *mo
     }
     stellar_module_set_ctx(sess_mgr_mod, sess_mgr);
 
-    SESSION_MANAGER_LOG_INFO("session_manager initialized");
+    SESSION_MANAGER_LOG_FATAL("session_manager initialized");
     return sess_mgr_mod;
 }
 
@@ -460,6 +461,6 @@ void session_manager_on_exit(struct stellar_module_manager *mod_mgr __attribute_
 
         session_manager_free(sess_mgr);
         stellar_module_free(mod);
-        SESSION_MANAGER_LOG_ERROR("session_manager exited");
+        SESSION_MANAGER_LOG_FATAL("session_manager exited");
     }
 }
\ No newline at end of file
diff --git a/infra/session_manager/session_manager_runtime.c b/infra/session_manager/session_manager_runtime.c
index 2ea160c..14a4ed3 100644
--- a/infra/session_manager/session_manager_runtime.c
+++ b/infra/session_manager/session_manager_runtime.c
@@ -1292,23 +1292,23 @@ void session_manager_runtime_print_stat(struct session_manager_runtime *sess_mgr
      struct session_manager_stat *stat = &sess_mgr_rt->stat;
 
      // TCP session
-     SESSION_MANAGER_LOG_INFO("TCP session: history=%lu, used=%lu, opening=%lu, active=%lu, closing=%lu, discard=%lu, closed=%lu",
-                              stat->history_tcp_sessions, stat->tcp_sess_used, stat->tcp_sess_opening, stat->tcp_sess_active,
+     SESSION_MANAGER_LOG_INFO("runtime[%p] => TCP session: history=%lu, used=%lu, opening=%lu, active=%lu, closing=%lu, discard=%lu, closed=%lu",
+                              sess_mgr_rt, stat->history_tcp_sessions, stat->tcp_sess_used, stat->tcp_sess_opening, stat->tcp_sess_active,
                               stat->tcp_sess_closing, stat->tcp_sess_discard, stat->tcp_sess_closed);
      // UDP session
-     SESSION_MANAGER_LOG_INFO("UDP session: history=%lu, used=%lu, opening=%lu, active=%lu, closing=%lu, discard=%lu, closed=%lu",
-                              stat->history_udp_sessions, stat->udp_sess_used, stat->udp_sess_opening, stat->udp_sess_active,
+     SESSION_MANAGER_LOG_INFO("runtime[%p] => UDP session: history=%lu, used=%lu, opening=%lu, active=%lu, closing=%lu, discard=%lu, closed=%lu",
+                              sess_mgr_rt, stat->history_udp_sessions, stat->udp_sess_used, stat->udp_sess_opening, stat->udp_sess_active,
                               stat->udp_sess_closing, stat->udp_sess_discard, stat->udp_sess_closed);
      // evicted session
-     SESSION_MANAGER_LOG_INFO("evicted session: TCP=%lu, UDP=%lu", stat->tcp_sess_evicted, stat->udp_sess_evicted);
+     SESSION_MANAGER_LOG_INFO("runtime[%p] => evicted session: TCP=%lu, UDP=%lu", sess_mgr_rt, stat->tcp_sess_evicted, stat->udp_sess_evicted);
      // Bypassed packet
-     SESSION_MANAGER_LOG_INFO("bypassed TCP packet: table_full=%lu, session_not_found=%lu, duplicated=%lu",
-                              stat->tcp_pkts_bypass_table_full, stat->tcp_pkts_bypass_session_not_found, stat->tcp_pkts_bypass_duplicated);
-     SESSION_MANAGER_LOG_INFO("bypassed UDP packet: table_full=%lu, session_evicted=%lu, duplicated=%lu",
-                              stat->udp_pkts_bypass_table_full, stat->udp_pkts_bypass_session_evicted, stat->udp_pkts_bypass_duplicated);
+     SESSION_MANAGER_LOG_INFO("runtime[%p] => bypassed TCP packet: table_full=%lu, session_not_found=%lu, duplicated=%lu",
+                              sess_mgr_rt, stat->tcp_pkts_bypass_table_full, stat->tcp_pkts_bypass_session_not_found, stat->tcp_pkts_bypass_duplicated);
+     SESSION_MANAGER_LOG_INFO("runtime[%p] => bypassed UDP packet: table_full=%lu, session_evicted=%lu, duplicated=%lu",
+                              sess_mgr_rt, stat->udp_pkts_bypass_table_full, stat->udp_pkts_bypass_session_evicted, stat->udp_pkts_bypass_duplicated);
      // TCP segment
-     SESSION_MANAGER_LOG_INFO("TCP segment: input=%lu, consumed=%lu, timeout=%lu, retransmited=%lu, overlapped=%lu, omitted_too_many=%lu, inorder=%lu, reordered=%lu, buffered=%lu, freed=%lu",
-                              stat->tcp_segs_input, stat->tcp_segs_consumed, stat->tcp_segs_timeout, stat->tcp_segs_retransmited,
+     SESSION_MANAGER_LOG_INFO("runtime[%p] => TCP segment: input=%lu, consumed=%lu, timeout=%lu, retransmited=%lu, overlapped=%lu, omitted_too_many=%lu, inorder=%lu, reordered=%lu, buffered=%lu, freed=%lu",
+                              sess_mgr_rt, stat->tcp_segs_input, stat->tcp_segs_consumed, stat->tcp_segs_timeout, stat->tcp_segs_retransmited,
                               stat->tcp_segs_overlapped, stat->tcp_segs_omitted_too_many, stat->tcp_segs_inorder, stat->tcp_segs_reordered,
                               stat->tcp_segs_buffered, stat->tcp_segs_freed);
 }
diff --git a/infra/session_manager/session_manager_runtime.h b/infra/session_manager/session_manager_runtime.h
index 5218bcb..c72c959 100644
--- a/infra/session_manager/session_manager_runtime.h
+++ b/infra/session_manager/session_manager_runtime.h
@@ -8,6 +8,7 @@ extern "C"
 #include "tuple.h"
 #include "stellar/session.h"
 
+#define SESSION_MANAGER_LOG_FATAL(format, ...) STELLAR_LOG_FATAL(__thread_local_logger, "session manager", format, ##__VA_ARGS__)
 #define SESSION_MANAGER_LOG_ERROR(format, ...) STELLAR_LOG_ERROR(__thread_local_logger, "session manager", format, ##__VA_ARGS__)
 #define SESSION_MANAGER_LOG_DEBUG(format, ...) STELLAR_LOG_DEBUG(__thread_local_logger, "session manager", format, ##__VA_ARGS__)
 #define SESSION_MANAGER_LOG_INFO(format, ...) STELLAR_LOG_INFO(__thread_local_logger, "session manager", format, ##__VA_ARGS__)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 3c972bd..1fdc838 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,6 +1,6 @@
 #add_subdirectory(packet_inject)
 add_subdirectory(packet_tool)
-#add_subdirectory(debug_plugin)
+add_subdirectory(session_debugger)
 #add_subdirectory(lpi_plugin)
 #add_subdirectory(decoders/http)
 #add_subdirectory(decoders/socks)
diff --git a/test/debug_plugin/CMakeLists.txt b/test/debug_plugin/CMakeLists.txt
deleted file mode 100644
index 707044e..0000000
--- a/test/debug_plugin/CMakeLists.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-# build libdebug_plugin.so
-add_library(debug_plugin SHARED debug_plugin.c)
-target_link_libraries(debug_plugin stellar_lib session_manager packet_manager)
-target_include_directories(debug_plugin PUBLIC ${CMAKE_SOURCE_DIR}/include/)
-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
diff --git a/test/debug_plugin/conf/spec.toml b/test/debug_plugin/conf/spec.toml
deleted file mode 100644
index 08ecfbf..0000000
--- a/test/debug_plugin/conf/spec.toml
+++ /dev/null
@@ -1,4 +0,0 @@
-[[plugin]]
-path = "./plugin/libdebug_plugin.so"
-init = "debug_plugin_init"
-exit = "debug_plugin_exit"
diff --git a/test/debug_plugin/debug_plugin.c b/test/debug_plugin/debug_plugin.c
deleted file mode 100644
index 63e89f9..0000000
--- a/test/debug_plugin/debug_plugin.c
+++ /dev/null
@@ -1,300 +0,0 @@
-#include <fcntl.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdarg.h>
-#include <pthread.h>
-
-#include "utils.h"
-#include "packet_dump.h"
-#include "session_internal.h"
-#include "stellar/stellar_mq.h"
-#include "stellar/stellar_exdata.h"
-
-#pragma GCC diagnostic ignored "-Wunused-parameter"
-
-static void debug_plugin_log(int fd, const char *module, const char *fmt, ...)
-{
-    static unsigned char weekday_str[7][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
-    static unsigned char month_str[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
-
-    int nwrite;
-    char buf[4096 * 2] = {0};
-    char *p = buf;
-    char *end = buf + sizeof(buf);
-    va_list args;
-    struct tm local;
-
-    time_t t;
-    time(&t);
-    localtime_r(&t, &local);
-
-    // add time
-    p += snprintf(p, end - p, "%s %s %d %02d:%02d:%02d %d ",
-                  weekday_str[local.tm_wday], month_str[local.tm_mon], local.tm_mday, local.tm_hour, local.tm_min, local.tm_sec, local.tm_year + 1900);
-    // add tid
-    p += snprintf(p, end - p, "%lu ", pthread_self());
-    // add module
-    p += snprintf(p, end - p, "(%s), ", module);
-    // add content
-    va_start(args, fmt);
-    p += vsnprintf(p, end - p, fmt, args);
-    va_end(args);
-    // add end of line
-    p += snprintf(p, end - p, "\n");
-
-    do
-    {
-        nwrite = write(fd, buf, p - buf);
-    } while (nwrite == -1 && errno == EINTR);
-}
-
-struct plugin_ctx
-{
-    struct stellar *st;
-    int sess_exdata_idx;
-    int sess_plug_id;
-    int tcp_topic_id;
-    int udp_topic_id;
-    int tcp_stream_topic_id;
-    int fd;
-    int c2s_tcp_seg_hexdump_fd;
-    int s2c_tcp_seg_hexdump_fd;
-    pthread_spinlock_t lock; // for hexdump thread safe
-};
-
-struct session_exdata
-{
-    uint64_t c2s_rx_pkts;
-    uint64_t s2c_rx_pkts;
-
-    uint64_t c2s_rx_bytes;
-    uint64_t s2c_rx_bytes;
-
-    uint64_t c2s_rx_tcp_seg;
-    uint64_t s2c_rx_tcp_seg;
-
-    uint64_t c2s_rx_tcp_bytes;
-    uint64_t s2c_rx_tcp_bytes;
-
-    int c2s_tcp_seg_hexdump_fd;
-    int s2c_tcp_seg_hexdump_fd;
-};
-
-static void *on_sess_new(struct session *sess, void *plugin_ctx)
-{
-    char buff[4096];
-    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
-    struct session_exdata *exdata = (struct session_exdata *)calloc(1, sizeof(struct session_exdata));
-
-    if (session_get_type(sess) == SESSION_TYPE_TCP)
-    {
-        memset(buff, 0, sizeof(buff));
-        sprintf(buff, "./log/debug_plugin.log.c2s_segment_%s", session_get0_readable_addr(sess));
-        ctx->c2s_tcp_seg_hexdump_fd = open(buff, O_WRONLY | O_APPEND | O_CREAT, 0644);
-
-        memset(buff, 0, sizeof(buff));
-        sprintf(buff, "./log/debug_plugin.log.s2c_segment_%s", session_get0_readable_addr(sess));
-        ctx->s2c_tcp_seg_hexdump_fd = open(buff, O_WRONLY | O_APPEND | O_CREAT, 0644);
-    }
-    session_exdata_set(sess, ctx->sess_exdata_idx, exdata);
-
-    memset(buff, 0, sizeof(buff));
-    session_to_str(sess, 1, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "sess new: %s", buff);
-
-    return NULL;
-}
-
-static void on_sess_free(struct session *sess, void *sess_ctx, void *plugin_ctx)
-{
-    char buff[4096];
-    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
-    struct session_exdata *exdata = (struct session_exdata *)session_exdata_get(sess, ctx->sess_exdata_idx);
-
-    memset(buff, 0, sizeof(buff));
-    session_to_str(sess, 0, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "sess free: %s", buff);
-    debug_plugin_log(ctx->fd, "debug plugin", "session %lu %s stat:\n"
-                                              "C2S rx      packets: %6lu, C2S rx     bytes: %6lu\n"
-                                              "S2C rx      packets: %6lu, S2C rx     bytes: %6lu\n"
-                                              "C2S rx TCP segments: %6lu, C2S rx TCP bytes: %6lu\n"
-                                              "S2C rx TCP segments: %6lu, S2C rx TCP bytes: %6lu\n",
-                     session_get_id(sess), session_get0_readable_addr(sess),
-                     exdata->c2s_rx_pkts, exdata->c2s_rx_bytes,
-                     exdata->s2c_rx_pkts, exdata->s2c_rx_bytes,
-                     exdata->c2s_rx_tcp_seg, exdata->c2s_rx_tcp_bytes,
-                     exdata->s2c_rx_tcp_seg, exdata->s2c_rx_tcp_bytes);
-    if (exdata->c2s_tcp_seg_hexdump_fd > 0)
-    {
-        close(exdata->c2s_tcp_seg_hexdump_fd);
-    }
-    if (exdata->s2c_tcp_seg_hexdump_fd > 0)
-    {
-        close(exdata->s2c_tcp_seg_hexdump_fd);
-    }
-}
-
-static void on_sess_udp_msg(struct session *sess, int topic_id, const void *msg, void *sess_ctx, void *plugin_ctx)
-{
-    if (msg == NULL)
-    {
-        return;
-    }
-
-    char buff[4096];
-    const struct packet *pkt = (const struct packet *)msg;
-    const struct timeval *tv = packet_get_timeval(pkt);
-    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
-    struct session_exdata *exdata = (struct session_exdata *)session_exdata_get(sess, ctx->sess_exdata_idx);
-    if (session_get_flow_type(sess) == FLOW_TYPE_C2S)
-    {
-        exdata->c2s_rx_pkts++;
-        exdata->c2s_rx_bytes += packet_get_raw_len(pkt);
-    }
-    else
-    {
-        exdata->s2c_rx_pkts++;
-        exdata->s2c_rx_bytes += packet_get_raw_len(pkt);
-    }
-
-    memset(buff, 0, sizeof(buff));
-    session_to_str(sess, 1, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "on UDP msg: %s", buff);
-
-    memset(buff, 0, sizeof(buff));
-    packet_dump_str(pkt, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "rx UDP packet (tv_sec: %lu, tv_usec: %lu): \n%s", tv->tv_sec, tv->tv_usec, buff);
-
-    pthread_spin_lock(&ctx->lock);
-    packet_dump_hex(pkt, ctx->fd);
-    pthread_spin_unlock(&ctx->lock);
-}
-
-static void on_sess_tcp_msg(struct session *sess, int topic_id, const void *msg, void *sess_ctx, void *plugin_ctx)
-{
-    if (msg == NULL)
-    {
-        return;
-    }
-
-    char buff[4096];
-    const struct packet *pkt = (const struct packet *)msg;
-    const struct timeval *tv = packet_get_timeval(pkt);
-    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
-    struct session_exdata *exdata = (struct session_exdata *)session_exdata_get(sess, ctx->sess_exdata_idx);
-    if (session_get_flow_type(sess) == FLOW_TYPE_C2S)
-    {
-        exdata->c2s_rx_pkts++;
-        exdata->c2s_rx_bytes += packet_get_raw_len(pkt);
-    }
-    else
-    {
-        exdata->s2c_rx_pkts++;
-        exdata->s2c_rx_bytes += packet_get_raw_len(pkt);
-    }
-
-    memset(buff, 0, sizeof(buff));
-    session_to_str(sess, 1, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "on TCP msg: %s", buff);
-
-    memset(buff, 0, sizeof(buff));
-    packet_dump_str(pkt, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "rx TCP packet (tv_sec: %lu, tv_usec: %lu): \n%s", tv->tv_sec, tv->tv_usec, buff);
-
-    pthread_spin_lock(&ctx->lock);
-    packet_dump_hex(pkt, ctx->fd);
-    pthread_spin_unlock(&ctx->lock);
-}
-
-static void on_sess_tcp_stream_msg(struct session *sess, int topic_id, const void *msg, void *sess_ctx, void *plugin_ctx)
-{
-    if (msg == NULL)
-    {
-        return;
-    }
-
-    char buff[4096];
-    const struct tcp_segment *seg = (const struct tcp_segment *)msg;
-    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
-    const char *data = tcp_segment_get_data(seg);
-    uint16_t len = tcp_segment_get_len(seg);
-    struct session_exdata *exdata = (struct session_exdata *)session_exdata_get(sess, ctx->sess_exdata_idx);
-
-    memset(buff, 0, sizeof(buff));
-    session_to_str(sess, 1, buff, sizeof(buff) - 1);
-    debug_plugin_log(ctx->fd, "debug plugin", "on TCP stream msg: %s", buff);
-
-    pthread_spin_lock(&ctx->lock);
-    if (session_get_flow_type(sess) == FLOW_TYPE_C2S)
-    {
-        debug_plugin_log(ctx->fd, "debug plugin", "rx C2S TCP segment: len: %d, data: %p", len, data);
-        hexdump_to_fd(ctx->fd, exdata->c2s_rx_tcp_bytes, data, len);
-        hexdump_to_fd(ctx->c2s_tcp_seg_hexdump_fd, exdata->c2s_rx_tcp_bytes, data, len);
-
-        exdata->c2s_rx_tcp_seg++;
-        exdata->c2s_rx_tcp_bytes += len;
-    }
-    else
-    {
-        debug_plugin_log(ctx->fd, "debug plugin", "rx S2C TCP segment: len: %d, data: %p", len, data);
-        hexdump_to_fd(ctx->fd, exdata->s2c_rx_tcp_bytes, data, len);
-        hexdump_to_fd(ctx->s2c_tcp_seg_hexdump_fd, exdata->s2c_rx_tcp_bytes, data, len);
-
-        exdata->s2c_rx_tcp_seg++;
-        exdata->s2c_rx_tcp_bytes += len;
-    }
-    pthread_spin_unlock(&ctx->lock);
-}
-
-/******************************************************************************
- * Plugin API
- ******************************************************************************/
-
-void *debug_plugin_init(struct stellar *st)
-{
-    struct plugin_ctx *ctx = (struct plugin_ctx *)calloc(1, sizeof(struct plugin_ctx));
-    if (ctx == NULL)
-    {
-        return NULL;
-    }
-
-    ctx->fd = open("./log/debug_plugin.log", O_WRONLY | O_APPEND | O_CREAT, 0644);
-    if (ctx->fd == -1)
-    {
-        printf("[debug plugin] open log file failed: %s\n", strerror(errno));
-        free(ctx);
-        return NULL;
-    }
-
-    pthread_spin_init(&ctx->lock, PTHREAD_PROCESS_PRIVATE);
-
-    ctx->st = st;
-    ctx->sess_exdata_idx = stellar_exdata_new_index(st, "DEBUG_PLUGIN_SESS_EXDATA", stellar_exdata_free_default, NULL);
-    ctx->sess_plug_id = stellar_session_plugin_register(st, on_sess_new, on_sess_free, ctx);
-    ctx->udp_topic_id = stellar_mq_get_topic_id(st, TOPIC_UDP_INPUT);
-    ctx->tcp_topic_id = stellar_mq_get_topic_id(st, TOPIC_TCP_INPUT);
-    ctx->tcp_stream_topic_id = stellar_mq_get_topic_id(st, TOPIC_TCP_STREAM);
-
-    stellar_session_mq_subscribe(st, ctx->udp_topic_id, on_sess_udp_msg, ctx->sess_plug_id);
-    stellar_session_mq_subscribe(st, ctx->tcp_topic_id, on_sess_tcp_msg, ctx->sess_plug_id);
-    stellar_session_mq_subscribe(st, ctx->tcp_stream_topic_id, on_sess_tcp_stream_msg, ctx->sess_plug_id);
-
-    debug_plugin_log(ctx->fd, "debug plugin", "init");
-
-    return ctx;
-}
-
-void debug_plugin_exit(void *plugin_ctx)
-{
-    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
-    if (ctx)
-    {
-        debug_plugin_log(ctx->fd, "debug plugin", "exit");
-        if (ctx->fd > 0)
-        {
-            close(ctx->fd);
-        }
-        pthread_spin_destroy(&ctx->lock);
-        free(ctx);
-    }
-}
\ No newline at end of file
diff --git a/test/debug_plugin/version.map b/test/debug_plugin/version.map
deleted file mode 100644
index 5e56b52..0000000
--- a/test/debug_plugin/version.map
+++ /dev/null
@@ -1,7 +0,0 @@
-DEBUG_PLUGIN {
-global:
-	debug_plugin_init;
-	debug_plugin_exit;
-
-local: *;
-};
\ No newline at end of file
diff --git a/test/session_debugger/CMakeLists.txt b/test/session_debugger/CMakeLists.txt
new file mode 100644
index 0000000..a8e6e79
--- /dev/null
+++ b/test/session_debugger/CMakeLists.txt
@@ -0,0 +1,8 @@
+# build libsession_debugger.so
+add_library(session_debugger SHARED session_debugger.c)
+target_link_libraries(session_debugger stellar_lib session_manager packet_manager)
+target_include_directories(session_debugger PUBLIC ${CMAKE_SOURCE_DIR}/include/)
+target_include_directories(session_debugger PUBLIC ${CMAKE_SOURCE_DIR}/infra)
+set_target_properties(session_debugger PROPERTIES LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/version.map")
+
+file(COPY spec.toml DESTINATION ./)
\ No newline at end of file
diff --git a/test/session_debugger/session_debugger.c b/test/session_debugger/session_debugger.c
new file mode 100644
index 0000000..a41610c
--- /dev/null
+++ b/test/session_debugger/session_debugger.c
@@ -0,0 +1,328 @@
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <limits.h>
+#include <pthread.h>
+
+#include "utils.h"
+#include "packet_dump.h"
+#include "session_internal.h"
+
+#include "stellar/log.h"
+#include "stellar/module_manager.h"
+#include "stellar/session_manager.h"
+
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
+struct session_debugger
+{
+    struct logger *logger;
+    pthread_spinlock_t lock; // for hexdump thread safe
+    struct session_manager *sess_mgr;
+    int fd;
+    int sess_exdata_idx;
+};
+
+struct session_debugger_exdata
+{
+    struct session_debugger *dbg;
+    struct session *sess;
+
+    uint64_t c2s_rx_pkts;
+    uint64_t s2c_rx_pkts;
+
+    uint64_t c2s_rx_bytes;
+    uint64_t s2c_rx_bytes;
+
+    uint64_t c2s_rx_tcp_seg;
+    uint64_t s2c_rx_tcp_seg;
+
+    uint64_t c2s_rx_tcp_bytes;
+    uint64_t s2c_rx_tcp_bytes;
+
+    int c2s_tcp_seg_hexdump_fd;
+    int s2c_tcp_seg_hexdump_fd;
+};
+
+static void session_debugger_log(int fd, const char *fmt, ...)
+{
+    static const char *module = "session_debugger";
+    static unsigned char weekday_str[7][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
+    static unsigned char month_str[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+
+    int nwrite;
+    char buf[PATH_MAX * 2] = {0};
+    char *p = buf;
+    char *end = buf + sizeof(buf);
+    va_list args;
+    struct tm local;
+
+    time_t t;
+    time(&t);
+    localtime_r(&t, &local);
+
+    p += snprintf(p, end - p, "%s %s %d %02d:%02d:%02d %d ",
+                  weekday_str[local.tm_wday], month_str[local.tm_mon], local.tm_mday, local.tm_hour, local.tm_min, local.tm_sec, local.tm_year + 1900);
+    p += snprintf(p, end - p, "%lu ", pthread_self());
+    p += snprintf(p, end - p, "(%s), ", module);
+    va_start(args, fmt);
+    p += vsnprintf(p, end - p, fmt, args);
+    va_end(args);
+    p += snprintf(p, end - p, "\n");
+
+    do
+    {
+        nwrite = write(fd, buf, p - buf);
+    } while (nwrite == -1 && errno == EINTR);
+}
+
+static struct session_debugger_exdata *session_debugger_exdata_new(struct session_debugger *dbg, struct session *sess)
+{
+    char buff[PATH_MAX];
+    struct session_debugger_exdata *exdata = (struct session_debugger_exdata *)calloc(1, sizeof(struct session_debugger_exdata));
+
+    exdata->dbg = dbg;
+    exdata->sess = sess;
+    if (session_get_type(sess) == SESSION_TYPE_TCP)
+    {
+        memset(buff, 0, sizeof(buff));
+        sprintf(buff, "./log/session_debugger.%s_c2s.hexdump", session_get0_readable_addr(sess));
+        exdata->c2s_tcp_seg_hexdump_fd = open(buff, O_WRONLY | O_APPEND | O_CREAT, 0644);
+
+        memset(buff, 0, sizeof(buff));
+        sprintf(buff, "./log/session_debugger.%s_s2c.hexdump", session_get0_readable_addr(sess));
+        exdata->s2c_tcp_seg_hexdump_fd = open(buff, O_WRONLY | O_APPEND | O_CREAT, 0644);
+    }
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    session_debugger_log(dbg->fd, "sess new: %s", buff);
+
+    return exdata;
+}
+
+static void session_debugger_exdata_free(struct session_debugger_exdata *exdata)
+{
+    if (exdata)
+    {
+        char buff[PATH_MAX] = {0};
+        session_to_str(exdata->sess, 0, buff, sizeof(buff) - 1);
+        session_debugger_log(exdata->dbg->fd, "sess free: %s", buff);
+        session_debugger_log(exdata->dbg->fd, "session %lu %s stat:\n"
+                                              "C2S rx      packets: %6lu, C2S rx     bytes: %6lu\n"
+                                              "S2C rx      packets: %6lu, S2C rx     bytes: %6lu\n"
+                                              "C2S rx TCP segments: %6lu, C2S rx TCP bytes: %6lu\n"
+                                              "S2C rx TCP segments: %6lu, S2C rx TCP bytes: %6lu\n",
+                             session_get_id(exdata->sess), session_get0_readable_addr(exdata->sess),
+                             exdata->c2s_rx_pkts, exdata->c2s_rx_bytes,
+                             exdata->s2c_rx_pkts, exdata->s2c_rx_bytes,
+                             exdata->c2s_rx_tcp_seg, exdata->c2s_rx_tcp_bytes,
+                             exdata->s2c_rx_tcp_seg, exdata->s2c_rx_tcp_bytes);
+
+        if (exdata->c2s_tcp_seg_hexdump_fd > 0)
+        {
+            close(exdata->c2s_tcp_seg_hexdump_fd);
+        }
+        if (exdata->s2c_tcp_seg_hexdump_fd > 0)
+        {
+            close(exdata->s2c_tcp_seg_hexdump_fd);
+        }
+
+        free(exdata);
+    }
+}
+
+static void session_debugger_exdata_free_callback(int idx, void *ex_ptr, void *arg)
+{
+    struct session_debugger *dbg = (struct session_debugger *)arg;
+    assert(idx == dbg->sess_exdata_idx);
+
+    session_debugger_exdata_free((struct session_debugger_exdata *)ex_ptr);
+}
+
+static void on_sess_msg(struct session *sess, struct packet *pkt, void *args)
+{
+    struct session_debugger *dbg = (struct session_debugger *)args;
+
+    char buff[PATH_MAX];
+    struct session_debugger_exdata *exdata = (struct session_debugger_exdata *)session_get_exdata(sess, dbg->sess_exdata_idx);
+    if (exdata == NULL)
+    {
+        exdata = session_debugger_exdata_new(dbg, sess);
+        session_set_exdata(sess, dbg->sess_exdata_idx, exdata);
+    }
+
+    if (session_get_flow_type(sess) == FLOW_TYPE_C2S)
+    {
+        exdata->c2s_rx_pkts++;
+        exdata->c2s_rx_bytes += packet_get_raw_len(pkt);
+    }
+    else
+    {
+        exdata->s2c_rx_pkts++;
+        exdata->s2c_rx_bytes += packet_get_raw_len(pkt);
+    }
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    session_debugger_log(dbg->fd, "on %s msg: %s", session_type_to_str(session_get_type(sess)), buff);
+
+    memset(buff, 0, sizeof(buff));
+    packet_dump_str(pkt, buff, sizeof(buff) - 1);
+    session_debugger_log(dbg->fd, "rx %s packet\n%s", session_type_to_str(session_get_type(sess)), buff);
+
+    pthread_spin_lock(&dbg->lock);
+    packet_dump_hex(pkt, dbg->fd);
+    pthread_spin_unlock(&dbg->lock);
+}
+
+static void on_tcp_stream_msg(struct session *sess, const char *tcp_payload, uint32_t tcp_payload_len, void *args)
+{
+    struct session_debugger *dbg = (struct session_debugger *)args;
+
+    char buff[PATH_MAX];
+    struct session_debugger_exdata *exdata = (struct session_debugger_exdata *)session_get_exdata(sess, dbg->sess_exdata_idx);
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    session_debugger_log(dbg->fd, "on TCP stream msg: %s", buff);
+
+    pthread_spin_lock(&dbg->lock);
+    if (session_get_flow_type(sess) == FLOW_TYPE_C2S)
+    {
+        session_debugger_log(dbg->fd, "rx C2S TCP segment: len: %d, data: %p", tcp_payload_len, tcp_payload);
+        hexdump_to_fd(dbg->fd, exdata->c2s_rx_tcp_bytes, tcp_payload, tcp_payload_len);
+        hexdump_to_fd(exdata->c2s_tcp_seg_hexdump_fd, exdata->c2s_rx_tcp_bytes, tcp_payload, tcp_payload_len);
+
+        exdata->c2s_rx_tcp_seg++;
+        exdata->c2s_rx_tcp_bytes += tcp_payload_len;
+    }
+    else
+    {
+        session_debugger_log(dbg->fd, "rx S2C TCP segment: len: %d, data: %p", tcp_payload_len, tcp_payload);
+        hexdump_to_fd(dbg->fd, exdata->s2c_rx_tcp_bytes, tcp_payload, tcp_payload_len);
+        hexdump_to_fd(exdata->s2c_tcp_seg_hexdump_fd, exdata->s2c_rx_tcp_bytes, tcp_payload, tcp_payload_len);
+
+        exdata->s2c_rx_tcp_seg++;
+        exdata->s2c_rx_tcp_bytes += tcp_payload_len;
+    }
+    pthread_spin_unlock(&dbg->lock);
+}
+
+static void session_debugger_free(struct session_debugger *dbg)
+{
+    if (dbg)
+    {
+        if (dbg->fd > 0)
+        {
+            close(dbg->fd);
+        }
+        pthread_spin_destroy(&dbg->lock);
+        free(dbg);
+    }
+}
+
+static struct session_debugger *session_debugger_new(struct session_manager *sess_mgr, struct logger *logger)
+{
+    struct session_debugger *dbg = (struct session_debugger *)calloc(1, sizeof(struct session_debugger));
+    if (dbg == NULL)
+    {
+        session_debugger_log(STDERR_FILENO, "new failed\n");
+        return NULL;
+    }
+
+    pthread_spin_init(&dbg->lock, PTHREAD_PROCESS_PRIVATE);
+
+    dbg->logger = logger;
+    dbg->sess_mgr = sess_mgr;
+    dbg->fd = open("./log/session_debugger.log", O_WRONLY | O_APPEND | O_CREAT, 0644);
+    if (dbg->fd == -1)
+    {
+        session_debugger_log(STDERR_FILENO, "open log file failed: %s\n", strerror(errno));
+        goto error_out;
+    }
+
+    dbg->sess_exdata_idx = session_manager_new_session_exdata_index(dbg->sess_mgr, "DEBUG_MODULE_SESS_EXDATA", session_debugger_exdata_free_callback, dbg);
+    if (dbg->sess_exdata_idx == -1)
+    {
+        session_debugger_log(STDERR_FILENO, "new session exdata index failed\n");
+        goto error_out;
+    }
+
+    if (session_manager_subscribe_tcp(sess_mgr, on_sess_msg, dbg) == -1)
+    {
+        session_debugger_log(STDERR_FILENO, "subscribe tcp failed\n");
+        goto error_out;
+    }
+    if (session_manager_subscribe_udp(sess_mgr, on_sess_msg, dbg) == -1)
+    {
+        session_debugger_log(STDERR_FILENO, "subscribe udp failed\n");
+        goto error_out;
+    }
+    if (session_manager_subscribe_control_packet(sess_mgr, on_sess_msg, dbg) == -1)
+    {
+        session_debugger_log(STDERR_FILENO, "subscribe control packet failed\n");
+        goto error_out;
+    }
+    if (session_manager_subscribe_tcp_stream(sess_mgr, on_tcp_stream_msg, dbg) == -1)
+    {
+        session_debugger_log(STDERR_FILENO, "subscribe tcp stream failed\n");
+        goto error_out;
+    }
+
+    return dbg;
+
+error_out:
+    session_debugger_free(dbg);
+    return NULL;
+}
+
+/******************************************************************************
+ * Plugin API
+ ******************************************************************************/
+
+struct stellar_module *session_debugger_on_init(struct stellar_module_manager *mod_mgr)
+{
+    assert(mod_mgr);
+
+    struct stellar_module *sess_mgr_mod = stellar_module_manager_get_module(mod_mgr, SESSION_MANAGER_MODULE_NAME);
+    assert(sess_mgr_mod);
+    struct session_manager *sess_mgr = stellar_module_get_ctx(sess_mgr_mod);
+    assert(sess_mgr);
+    struct logger *logger = stellar_module_manager_get_logger(mod_mgr);
+    assert(logger);
+
+    struct session_debugger *dbg = session_debugger_new(sess_mgr, logger);
+    if (dbg == NULL)
+    {
+        return NULL;
+    }
+
+    struct stellar_module *dbg_mod = stellar_module_new("session_debugger", NULL);
+    if (dbg_mod == NULL)
+    {
+        session_debugger_free(dbg);
+        return NULL;
+    }
+    stellar_module_set_ctx(dbg_mod, dbg);
+
+    STELLAR_LOG_FATAL(dbg->logger, "session_debugger", "session_debugger initialized")
+
+    return dbg_mod;
+}
+
+void session_debugger_on_exit(struct stellar_module_manager *mod_mgr, struct stellar_module *mod)
+{
+    if (mod)
+    {
+        struct session_debugger *dbg = stellar_module_get_ctx(mod);
+        if (dbg)
+        {
+            STELLAR_LOG_FATAL(dbg->logger, "session_debugger", "session_debugger exited")
+            session_debugger_free(dbg);
+        }
+        stellar_module_free(mod);
+    }
+}
\ No newline at end of file
diff --git a/test/session_debugger/spec.toml b/test/session_debugger/spec.toml
new file mode 100644
index 0000000..19a4a9b
--- /dev/null
+++ b/test/session_debugger/spec.toml
@@ -0,0 +1,4 @@
+[[module]]
+path = "./module/libsession_debugger.so"
+init = "session_debugger_on_init"
+exit = "session_debugger_on_exit"
diff --git a/test/session_debugger/version.map b/test/session_debugger/version.map
new file mode 100644
index 0000000..66edc94
--- /dev/null
+++ b/test/session_debugger/version.map
@@ -0,0 +1,7 @@
+LIBSESSION_DEBUGGER {
+global:
+	session_debugger_on_init;
+	session_debugger_on_exit;
+
+local: *;
+};
\ No newline at end of file