diff --git a/src/core/main.cpp b/src/core/main.cpp
index 1e5fb81..84b9ec4 100644
--- a/src/core/main.cpp
+++ b/src/core/main.cpp
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stddef.h>
 #include <signal.h>
+#include <stdlib.h>
 
 #include "stellar/log.h"
 #include "stellar/stellar.h"
@@ -13,19 +14,13 @@ static void signal_handler(int signo)
 
     if (signo == SIGINT)
     {
-        STELLAR_LOG_FATAL(logger, "signal", "SIGINT received, notify threads to exit");
-        stellar_loopbreak(st);
+        STELLAR_LOG_FATAL(logger, "signal", "SIGINT received, force exit");
+        exit(0);
     }
 
-    if (signo == SIGQUIT)
+    if (signo == SIGSTOP)
     {
-        STELLAR_LOG_FATAL(logger, "signal", "SIGQUIT received, notify threads to exit");
-        stellar_loopbreak(st);
-    }
-
-    if (signo == SIGTERM)
-    {
-        STELLAR_LOG_FATAL(logger, "signal", "SIGTERM received, notify threads to exit");
+        STELLAR_LOG_FATAL(logger, "signal", "SIGSTOP received, notify threads graceful exit");
         stellar_loopbreak(st);
     }
 
diff --git a/src/core/stellar_core.cpp b/src/core/stellar_core.cpp
index ac18870..992a45c 100644
--- a/src/core/stellar_core.cpp
+++ b/src/core/stellar_core.cpp
@@ -42,7 +42,6 @@ struct stellar_thread
     pthread_t tid;
     uint16_t idx;
     uint64_t is_runing;
-    uint64_t need_exit;
     uint64_t last_free_expired_session_timestamp;
     uint64_t last_free_expired_ip_frag_timestamp;
     uint64_t last_merge_thread_stat_timestamp;
@@ -227,7 +226,7 @@ static void *work_thread(void *arg)
     ATOMIC_SET(&thread->is_runing, 1);
     CORE_LOG_FATAL("worker thread %d runing", thr_idx);
 
-    while (ATOMIC_READ(&thread->need_exit) == 0)
+    while (ATOMIC_READ(&runtime->need_exit) == 0)
     {
         /*
          * We use the system's real time instead of monotonic time for the following reasons:
@@ -366,13 +365,15 @@ static void *work_thread(void *arg)
         }
     }
 
-    if (froce_session_expire_before_exit)
+    while (sess_stat->tcp_sess_used > 0 || sess_stat->udp_sess_used > 0)
     {
-        free_expired_sessions(sess_mgr, UINT64_MAX, UINT64_MAX);
-    }
-    else
-    {
-        while (sess_stat->tcp_sess_used > 0 || sess_stat->udp_sess_used > 0)
+        // froce session expire
+        if (froce_session_expire_before_exit)
+        {
+            free_expired_sessions(sess_mgr, free_expired_session_batch, UINT64_MAX);
+        }
+        // wait session expire
+        else
         {
             now_ms = clock_get_real_time_ms();
             free_expired_sessions(sess_mgr, free_expired_session_batch, now_ms);
@@ -605,11 +606,7 @@ void stellar_run(struct stellar *st)
         // only available in dumpfile mode
         if (packet_io_isbreak(runtime->packet_io))
         {
-            for (uint16_t i = 0; i < config->pkt_io_opts.nr_threads; i++)
-            {
-                struct stellar_thread *thread = &runtime->threads[i];
-                ATOMIC_SET(&thread->need_exit, 1);
-            }
+            ATOMIC_SET(&runtime->need_exit, 1);
             CORE_LOG_FATAL("notify worker thread to exit");
             stellar_stat_output(runtime->stat); // flush stat
             break;
diff --git a/src/packet_io/dumpfile_io.cpp b/src/packet_io/dumpfile_io.cpp
index 138ff3f..005ce7f 100644
--- a/src/packet_io/dumpfile_io.cpp
+++ b/src/packet_io/dumpfile_io.cpp
@@ -277,7 +277,7 @@ erro_out:
         usleep(1000); // 1ms
     }
 
-    PACKET_IO_LOG_FATAL("dumpfile io thread exit");
+    PACKET_IO_LOG_FATAL("dumpfile io thread exit (read_pcap_files: %lu, read_pcap_pkts: %lu)", handle->read_pcap_files, ATOMIC_READ(&handle->read_pcap_pkts));
     ATOMIC_SET(&handle->io_thread_is_runing, 0);
 
     return NULL;
@@ -335,8 +335,6 @@ void dumpfile_io_free(struct dumpfile_io *handle)
             usleep(1000);
         }
 
-        PACKET_IO_LOG_FATAL("dumpfile io thread read pcap files %lu, read pcap pkts %lu", handle->read_pcap_files, ATOMIC_READ(&handle->read_pcap_pkts));
-
         struct pcap_pkt *pcap_pkt = NULL;
         for (uint16_t i = 0; i < handle->nr_threads; i++)
         {