diff --git a/trunk/src/app/srs_app_st.cpp b/trunk/src/app/srs_app_st.cpp
index 04de607c7e..523ca06518 100755
--- a/trunk/src/app/srs_app_st.cpp
+++ b/trunk/src/app/srs_app_st.cpp
@@ -125,6 +125,7 @@ SrsFastCoroutine::SrsFastCoroutine(string n, ISrsCoroutineHandler* h)
     trd = NULL;
     trd_err = srs_success;
     started = interrupted = disposed = cycle_done = false;
+    stopping_ = false;
 
     //  0 use default, default is 64K.
     stack_size = 0;
@@ -138,6 +139,7 @@ SrsFastCoroutine::SrsFastCoroutine(string n, ISrsCoroutineHandler* h, SrsContext
     trd = NULL;
     trd_err = srs_success;
     started = interrupted = disposed = cycle_done = false;
+    stopping_ = false;
 
     //  0 use default, default is 64K.
     stack_size = 0;
@@ -192,9 +194,14 @@ srs_error_t SrsFastCoroutine::start()
 void SrsFastCoroutine::stop()
 {
     if (disposed) {
+        if (stopping_) {
+            srs_error("thread is stopping by %s", stopping_cid_.c_str());
+            srs_assert(!stopping_);
+        }
         return;
     }
     disposed = true;
+    stopping_ = true;
     
     interrupt();
 
@@ -225,6 +232,9 @@ void SrsFastCoroutine::stop()
     if (trd_err == srs_success && !cycle_done) {
         trd_err = srs_error_new(ERROR_THREAD_TERMINATED, "terminated");
     }
+
+    // Now, we'are stopped.
+    stopping_ = false;
     
     return;
 }
diff --git a/trunk/src/app/srs_app_st.hpp b/trunk/src/app/srs_app_st.hpp
index b881267c34..8357c4b9c5 100644
--- a/trunk/src/app/srs_app_st.hpp
+++ b/trunk/src/app/srs_app_st.hpp
@@ -163,6 +163,10 @@ class SrsFastCoroutine
     bool disposed;
     // Cycle done, no need to interrupt it.
     bool cycle_done;
+private:
+    // Sub state in disposed, we need to wait for thread to quit.
+    bool stopping_;
+    SrsContextId stopping_cid_;
 public:
     SrsFastCoroutine(std::string n, ISrsCoroutineHandler* h);
     SrsFastCoroutine(std::string n, ISrsCoroutineHandler* h, SrsContextId cid);