diff --git a/bin/mqtt5_canary/main.cpp b/bin/mqtt5_canary/main.cpp
index 6df78de77..5b23db4f6 100644
--- a/bin/mqtt5_canary/main.cpp
+++ b/bin/mqtt5_canary/main.cpp
@@ -278,6 +278,7 @@ struct AwsMqtt5CanaryStatistic
 
 struct AwsMqtt5CanaryTestClient
 {
+    struct aws_mutex client_lock;
     std::shared_ptr<Mqtt5::Mqtt5Client> client;
     std::shared_ptr<Mqtt5::NegotiatedSettings> settings;
     Aws::Crt::String sharedTopic;
@@ -497,6 +498,10 @@ static int s_AwsMqtt5CanaryOperationUnsubscribeBad(struct AwsMqtt5CanaryTestClie
                         testClient->clientId.c_str(),
                         packet->getReasonString()->c_str());
                 }
+                else
+                {
+                    ++g_statistic.unsub_failed;
+                }
             }))
     {
         AWS_LOGF_INFO(AWS_LS_MQTT5_CANARY, "ID:%s Unsubscribe Bad", testClient->clientId.c_str());
@@ -916,6 +921,7 @@ int main(int argc, char **argv)
         {
             struct AwsMqtt5CanaryTestClient client;
             client = {};
+            aws_mutex_init(&client.client_lock);
             Aws::Crt::UUID uuid;
             client.clientId = String("TestClient") + std::to_string(i).c_str() + "_" + uuid.ToString();
             client.sharedTopic = Aws::Crt::String(sharedTopicArray);
@@ -923,27 +929,32 @@ int main(int argc, char **argv)
             clients.push_back(client);
             mqtt5Options.WithAckTimeoutSeconds(10);
             mqtt5Options.WithPublishReceivedCallback([&clients, i](const Mqtt5::PublishReceivedEventData &publishData) {
-                AWS_LOGF_INFO(
-                    AWS_LS_MQTT5_CANARY,
-                    "Client:%s Publish Received on topic %s",
-                    clients[i].clientId.c_str(),
-                    publishData.publishPacket->getTopic().c_str());
+                if (aws_mutex_try_lock(&clients[i].client_lock) == AWS_OP_SUCCESS)
+                {
+                    AWS_LOGF_INFO(
+                        AWS_LS_MQTT5_CANARY,
+                        "Client:%s Publish Received on topic %s",
+                        clients[i].clientId.c_str(),
+                        publishData.publishPacket->getTopic().c_str());
+                    aws_mutex_unlock(&clients[i].client_lock);
+                }
             });
 
             mqtt5Options.WithClientConnectionSuccessCallback(
                 [&clients, i](const Mqtt5::OnConnectionSuccessEventData &eventData) {
+                    aws_mutex_lock(&clients[i].client_lock);
                     clients[i].isConnected = true;
-                    clients[i].clientId = Aws::Crt::String(
-                        eventData.negotiatedSettings->getClientId().c_str(),
-                        eventData.negotiatedSettings->getClientId().length());
+                    clients[i].clientId = eventData.negotiatedSettings->getClientId();
                     clients[i].settings = eventData.negotiatedSettings;
 
                     AWS_LOGF_INFO(
                         AWS_LS_MQTT5_CANARY, "ID:%s Lifecycle Event: Connection Success", clients[i].clientId.c_str());
+                    aws_mutex_unlock(&clients[i].client_lock);
                 });
 
             mqtt5Options.WithClientConnectionFailureCallback(
                 [&clients, i](const OnConnectionFailureEventData &eventData) {
+                    aws_mutex_lock(&clients[i].client_lock);
                     clients[i].isConnected = false;
                     AWS_LOGF_ERROR(
                         AWS_LS_MQTT5_CANARY,
@@ -951,16 +962,21 @@ int main(int argc, char **argv)
                         clients[i].clientId.c_str(),
                         eventData.errorCode,
                         aws_error_debug_str(eventData.errorCode));
+                    aws_mutex_unlock(&clients[i].client_lock);
                 });
 
             mqtt5Options.WithClientDisconnectionCallback([&clients, i](const OnDisconnectionEventData &) {
+                aws_mutex_lock(&clients[i].client_lock);
                 clients[i].isConnected = false;
                 AWS_LOGF_ERROR(AWS_LS_MQTT5_CANARY, "ID:%s Lifecycle Event: Disconnect", clients[i].clientId.c_str());
+                aws_mutex_unlock(&clients[i].client_lock);
             });
 
             mqtt5Options.WithClientStoppedCallback([&clients, i](const OnStoppedEventData &) {
+                aws_mutex_lock(&clients[i].client_lock);
                 clients[i].isConnected = false;
                 AWS_LOGF_ERROR(AWS_LS_MQTT5_CANARY, "ID:%s Lifecycle Event: Stopped", clients[i].clientId.c_str());
+                aws_mutex_unlock(&clients[i].client_lock);
             });
 
             clients[i].client = Mqtt5::Mqtt5Client::NewMqtt5Client(mqtt5Options, appCtx.allocator);
@@ -1007,7 +1023,13 @@ int main(int argc, char **argv)
             awsMqtt5CanaryOperationFn *operation_fn =
                 s_AwsMqtt5CanaryOperationTable.operationByOperationType[nextOperation];
 
-            (*operation_fn)(&clients[rand() % clients.size()], appCtx.allocator);
+            size_t random_client_id = rand() % clients.size();
+            if(aws_mutex_try_lock(&clients[random_client_id].client_lock) == AWS_OP_SUCCESS)
+            {
+
+                (*operation_fn)(&clients[random_client_id], appCtx.allocator);
+                aws_mutex_unlock(&clients[random_client_id].client_lock);
+            }
 
             if (now > timeTestFinish)
             {