diff --git a/Platform/modules/trace-relay/trace_init.c b/Platform/modules/trace-relay/trace_init.c
index 937290472..f466de248 100755
--- a/Platform/modules/trace-relay/trace_init.c
+++ b/Platform/modules/trace-relay/trace_init.c
@@ -53,6 +53,7 @@ static int trace_rcv_policy(struct sk_buff *skb, struct nlmsghdr *nlh, struct ne
             hdr = (trace_hdr_t *)RTA_DATA(rta);
             printk(KERN_INFO "Receive type:%u of message, version:%u, sequence:%u, is_reply:%u ", 
                         nlh->nlmsg_type, hdr->ver, hdr->seq, hdr->is_reply);
+            printk(KERN_INFO "Receive netlink-message-pid:%u ", nlh->nlmsg_pid);
             policy = (trace_policy_t *)(hdr + 1);
             printk(KERN_DEBUG "Receive policy:");
             printk(KERN_DEBUG "   protocol:%u", policy->protocol);
diff --git a/Platform/user/trace/trace-api/trace_api.c b/Platform/user/trace/trace-api/trace_api.c
index 96cd24d16..57a43b813 100755
--- a/Platform/user/trace/trace-api/trace_api.c
+++ b/Platform/user/trace/trace-api/trace_api.c
@@ -12,7 +12,7 @@
 #include <sys/ipc.h>
 #include <sys/msg.h>
 #include <sys/sysinfo.h>
-
+#include <arpa/inet.h>
 
 #include "libnetlinku.h"
 //#include "policy_client.h"
@@ -36,6 +36,9 @@
 
 #define NETLINK_GROUP_TRACE_ID      0
 
+#define EXEC_CR_SK_WAIT_TIMEOUT     2
+
+
 typedef struct _cb_arg {
     struct hlist_node   node;
     uint32_t            seq;
@@ -64,6 +67,8 @@ static uint32_t g_seq = 0;
 
 static volatile sess_t   g_sess = {0};
 static int g_channel_open = -1;
+static sem_t g_cr_sk_sem;
+
 
 static trace_ret_t get_and_del_arg_from_hlist(const uint32_t seq, cb_arg_t **out)
 {
@@ -158,6 +163,17 @@ static int trace_recv_handle(struct pdelivnl_ctrl_data *ctrl,
 static void *cb_thread(void *arg)
 {
     SYSLOG_INFO("Callback thread is started");
+	
+    g_channel_open = pdelivnl_open(NETLINK_GROUP_TRACE_ID);
+    if(g_channel_open < 0)
+    {
+        SYSLOG_ERR("pdelivnl_open fail:%d", g_channel_open);
+        return NULL;
+    }
+
+    if (sem_post(&g_cr_sk_sem) != 0) {
+        SYSLOG_ERR("Set semaphore of g_cr_sk_sem is failure:%d", errno);
+    }
 
     pdelivnl_listen(NETLINK_GROUP_TRACE_ID, trace_recv_handle, NULL);
     
@@ -174,7 +190,7 @@ static trace_ret_t cfg_channel_send(const uint32_t seq, const trace_policy_t  *p
     hdr->nlmsg_len = NLMSG_HDRLEN;
     hdr->nlmsg_flags = NLM_F_REQUEST /* | NLM_F_ACK */;
 	hdr->nlmsg_type = TRACE_CFG_POLICY_REQ;
-    hdr->nlmsg_pid = getpid();
+ //   hdr->nlmsg_pid = getpid();
 
     trace_req_t req;
     req.hdr.ver = 1;
@@ -184,12 +200,15 @@ static trace_ret_t cfg_channel_send(const uint32_t seq, const trace_policy_t  *p
     
     commnl_addattr_l(hdr, sizeof(buf), TRACE_MSG_POLICY_REQ, &req, sizeof(trace_req_t));	
 	SYSLOG_DEBUG("Send msg len:%u, msg_flag:%u, msg_type:%u", hdr->nlmsg_len, hdr->nlmsg_flags, hdr->nlmsg_type);
+    SYSLOG_DEBUG("Send netlink-message-pid:%u ", hdr->nlmsg_pid);
     SYSLOG_DEBUG("Send hdr: is_reply:%d, seq:%u, ver:%u", req.hdr.is_reply, req.hdr.seq, req.hdr.ver);
     SYSLOG_DEBUG("Send policy:");
-    SYSLOG_DEBUG("    src family:%u, src ip:%02x, sport:%u", 
-            req.policy.src.family, req.policy.src.addr.ip4.s_addr, req.policy.sport);    
-    SYSLOG_DEBUG("    dst family:%u, dst ip:%02x, dport:%u", 
-            req.policy.dst.family, req.policy.dst.addr.ip4.s_addr, req.policy.dport); 
+    SYSLOG_DEBUG("    src family:%u, src ip:%02x (%s), sport:%u (host order %u)", 
+            req.policy.src.family, req.policy.src.addr.ip4.s_addr, inet_ntoa(req.policy.src.addr.ip4),
+            req.policy.sport, ntohs(req.policy.sport));    
+    SYSLOG_DEBUG("    dst family:%u, dst ip:%02x (%s), dport:%u (host order %u)", 
+            req.policy.dst.family, req.policy.dst.addr.ip4.s_addr, inet_ntoa(req.policy.dst.addr.ip4),
+            req.policy.dport, ntohs(req.policy.dport)); 
     SYSLOG_DEBUG("    protocol:%u, app_type:%u, base_type:%u", req.policy.protocol, req.policy.app_type, req.policy.base_type); 
 
 	/*发送组装好的netlink消息*/
@@ -230,19 +249,43 @@ trace_ret_t trace_client_init()
     }
 
     //g_channel_open = commcfgnl_open();
+    /* netlink通信机制决定同一个线程里不能同时启用两个pdeliv socket，
+     * 鉴于trace库的调用者（如DPI）可能原本已启用了一个pdeliv socket，
+     * 因此，将trace库里的pdeliv socket创建移至trace的子线程中 */
+    #if 0 
     g_channel_open = pdelivnl_open(NETLINK_GROUP_TRACE_ID);
     if(g_channel_open < 0)
 	{
 		SYSLOG_ERR("pdelivnl_open fail:%d", g_channel_open);
 		goto FAIL;
 	}
+    #endif
+
+    if (sem_init(&g_cr_sk_sem, 0, 0) != 0) {
+        SYSLOG_ERR("Init g_cr_sk_sem is failure:%d", errno);
+        goto FAIL;
+    }
+
+    struct timespec timeout;
+    if (clock_gettime(CLOCK_REALTIME, &timeout) == -1) {
+        SYSLOG_ERR("Get current time is failure:%d", errno);
+        goto FAIL;
+    }
+
+    timeout.tv_sec += EXEC_CR_SK_WAIT_TIMEOUT;
     
     int ret = pthread_create(&g_client_thread, NULL, cb_thread, NULL);
     if (ret != 0) {      
         SYSLOG_ERR("Create the thread of callback is failure:%d", ret);
         goto FAIL;
     }
-    
+
+    /* 如果sem 信号量值>0，则sem_timedwait 立即返回；
+     * 如果sem 信号量值≤0，则 sem_timedwait 阻塞等待 TIMEOUT秒后再返回。*/
+    ret = sem_timedwait(&g_cr_sk_sem, &timeout);
+    SYSLOG_DEBUG("sem_timedwait for g_cr_sk_sem, return:%d", ret);
+
+    sem_destroy(&g_cr_sk_sem);
     return TRACE_SUCCESS;
 FAIL:
     while (i > 0) {
@@ -250,7 +293,8 @@ FAIL:
         pthread_mutex_destroy((pthread_mutex_t *)&g_sess.hsess_mutex[i]);
     }
     cfg_channel_close();
-    
+
+    sem_destroy(&g_cr_sk_sem);
     return TRACE_FAILURE;
 }