diff --git a/.github/workflows/user_function_tracer.yml b/.github/workflows/user_function_tracer.yml
index f658b8461..f4a998425 100644
--- a/.github/workflows/user_function_tracer.yml
+++ b/.github/workflows/user_function_tracer.yml
@@ -36,6 +36,10 @@ jobs:
           gcc test/sleep.c -o test/sleep
           gcc test/mmap.c -o test/mmap
           gcc test/strcpy.c -o test/strcpy
+          gcc test/fib.c -o test/fib
+          gcc test/thread.c -o test/thread
           sudo build/utrace -c test/sleep
           sudo build/utrace -c test/mmap
           sudo build/utrace -c test/strcpy
+          sudo build/utrace -c test/fib
+          sudo build/utrace -c test/thread
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/args.c b/eBPF_Supermarket/User_Function_Tracer/test/args.c
deleted file mode 100644
index b91582ef9..000000000
--- a/eBPF_Supermarket/User_Function_Tracer/test/args.c
+++ /dev/null
@@ -1,68 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-
-void foobar() {}
-
-void foo() {}
-
-void bar() {
-  foobar();
-  foobar();
-}
-
-void tf1() {}
-
-void tf2() {}
-
-void arg_int3(int x, int y, int z) {
-  /*
-      printf("&x: %p\n", &x);
-      printf("&y: %p\n", &y);
-      printf("&z: %p\n", &z);
-  */
-}
-void arg_int2(int a, int b) { arg_int3(a, b, b + 1); }
-void arg_int1(int i) { arg_int2(i, i + 1); }
-
-void arg_uint3(unsigned int x, unsigned int y, unsigned int z) {}
-void arg_uint2(unsigned int a, unsigned int b) { arg_uint3(a, b, b + 1); }
-void arg_uint1(unsigned int i) { arg_uint2(i, i + 1); }
-
-void arg_char3(char x, char y, char z) {}
-void arg_char2(char a, char b) { arg_char3(a, b, b + 1); }
-void arg_char1(char i) { arg_char2(i, i + 1); }
-
-void arg_short3(short x, short y, short z) {}
-void arg_short2(short a, short b) { arg_short3(a, b, b + 1); }
-void arg_short1(short i) { arg_short2(i, i + 1); }
-
-void arg_long3(long x, long y, long z) {}
-void arg_long2(long a, long b) { arg_long3(a, b, b + 1); }
-void arg_long1(long i) { arg_long2(i, i + 1); }
-void arg_ulong3(unsigned long x, unsigned long y, unsigned long z) {}
-void arg_ulong2(unsigned long a, unsigned long b) { arg_ulong3(a, b, b + 1); }
-void arg_ulong1(long i) { arg_ulong2(i, i + 1); }
-
-void arg_longlong3(long long x, long long y, long long z) {}
-void arg_longlong2(long long a, long long b) { arg_longlong3(a, b, b + 1); }
-void arg_longlong1(long long i) { arg_longlong2(i, i + 1); }
-void arg_ulonglong3(unsigned long long x, unsigned long long y, unsigned long long z) {}
-void arg_ulonglong2(unsigned long long a, unsigned long long b) { arg_ulonglong3(a, b, b + 1); }
-void arg_ulonglong1(unsigned long long i) { arg_ulonglong2(i, i + 1); }
-
-void arg_test(int x, char *z) {}
-
-int main(int argc, char *argv[]) {
-  sleep(2);
-  arg_int1(10);
-  arg_uint1(10);
-  arg_char1(20);
-  arg_short1(30);
-  arg_long1(40);
-  arg_ulong1(50);
-  arg_longlong1(60);
-  arg_ulonglong1(70);
-  arg_test(100, NULL);
-  return 0;
-}
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/fib.c b/eBPF_Supermarket/User_Function_Tracer/test/fib.c
index b610a5c01..a3d112d9b 100644
--- a/eBPF_Supermarket/User_Function_Tracer/test/fib.c
+++ b/eBPF_Supermarket/User_Function_Tracer/test/fib.c
@@ -1,6 +1,20 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
+// Copyright 2023 The LMP Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// author: jinyufeng2000@gmail.com
+//
+// 测试递归函数调用
 
 int fib(int n) {
   if (n <= 2) return 1;
@@ -8,8 +22,6 @@ int fib(int n) {
 }
 
 int main() {
-  sleep(2);
-  int n = 8;
-
-  return !!fib(n);
+  fib(9);
+  return 0;
 }
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/mmap b/eBPF_Supermarket/User_Function_Tracer/test/mmap
deleted file mode 100755
index e71531007..000000000
Binary files a/eBPF_Supermarket/User_Function_Tracer/test/mmap and /dev/null differ
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/mmap.c b/eBPF_Supermarket/User_Function_Tracer/test/mmap.c
index f470049ac..4bc2cb73f 100644
--- a/eBPF_Supermarket/User_Function_Tracer/test/mmap.c
+++ b/eBPF_Supermarket/User_Function_Tracer/test/mmap.c
@@ -1,3 +1,21 @@
+// Copyright 2023 The LMP Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// author: jinyufeng2000@gmail.com
+//
+// 测试库函数调用
+
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/short.c b/eBPF_Supermarket/User_Function_Tracer/test/short.c
deleted file mode 100644
index 7ec36c1aa..000000000
--- a/eBPF_Supermarket/User_Function_Tracer/test/short.c
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <stdio.h>
-
-void h() {}
-void g() { h(); }
-void f() { g(); }
-
-int main() {
-  f();
-  return 0;
-}
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/sleep.c b/eBPF_Supermarket/User_Function_Tracer/test/sleep.c
index 761a3e1ad..53ed5583b 100644
--- a/eBPF_Supermarket/User_Function_Tracer/test/sleep.c
+++ b/eBPF_Supermarket/User_Function_Tracer/test/sleep.c
@@ -1,4 +1,21 @@
-#include <stdio.h>
+// Copyright 2023 The LMP Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// author: jinyufeng2000@gmail.com
+//
+// 测试函数时延统计
+
 #include <unistd.h>
 
 void g() { sleep(2); }
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/strcpy.c b/eBPF_Supermarket/User_Function_Tracer/test/strcpy.c
index eefccaded..0552347a2 100644
--- a/eBPF_Supermarket/User_Function_Tracer/test/strcpy.c
+++ b/eBPF_Supermarket/User_Function_Tracer/test/strcpy.c
@@ -1,3 +1,21 @@
+// Copyright 2023 The LMP Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// author: jinyufeng2000@gmail.com
+//
+// 测试库函数调用，涉及IFUNC符号
+
 #include <stdlib.h>
 #include <string.h>
 int main() {
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/test.c b/eBPF_Supermarket/User_Function_Tracer/test/test.c
deleted file mode 100644
index f07b4e027..000000000
--- a/eBPF_Supermarket/User_Function_Tracer/test/test.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include <unistd.h>
-
-int main() {
-  sleep(2);
-  return 0;
-}
diff --git a/eBPF_Supermarket/User_Function_Tracer/test/thread.c b/eBPF_Supermarket/User_Function_Tracer/test/thread.c
new file mode 100644
index 000000000..1ee2c463d
--- /dev/null
+++ b/eBPF_Supermarket/User_Function_Tracer/test/thread.c
@@ -0,0 +1,41 @@
+// Copyright 2023 The LMP Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// author: jinyufeng2000@gmail.com
+//
+// 测试多线程程序
+
+#include <assert.h>
+#include <pthread.h>
+
+static void* c(void* n) { return n; }
+
+static void* b(void* n) { return c(n); }
+
+static void* a(void* n) { return b(n); }
+
+int main() {
+  int i;
+  void* v;
+  int n = 10;
+  pthread_t t[4];
+
+  for (i = 0; i < 4; i++) pthread_create(&t[i], NULL, a, &n);
+  for (i = 0; i < 4; i++) {
+    pthread_join(t[i], &v);
+  }
+
+  assert(*(int*)v == n);
+  return 0;
+}