diff --git a/safekeeper/src/sim/client.rs b/safekeeper/src/sim/client.rs
index bf67df94cc..dede5d4950 100644
--- a/safekeeper/src/sim/client.rs
+++ b/safekeeper/src/sim/client.rs
@@ -6,7 +6,9 @@ pub fn run_client(os: NodeOs, data: &[u32], dst: NodeId) {
     
     let sock = os.open_tcp(dst);
     for num in data {
+        println!("start send data from client");
         sock.send(AnyMessage::Just32(num.clone()));
+        println!("finish send data from client");
     }
 
     println!("sent all data and finished client");
diff --git a/safekeeper/src/sim/sync.rs b/safekeeper/src/sim/sync.rs
index 680835c7dc..d49e0d6957 100644
--- a/safekeeper/src/sim/sync.rs
+++ b/safekeeper/src/sim/sync.rs
@@ -55,6 +55,7 @@ impl Condvar {
         if let Some(waiter) = state.waiters.pop() {
             waiter.wake();
         }
+        drop(state);
 
         // yield the current thread to the scheduler
         Park::yield_thread();