diff --git a/cmd/xgo/runtime_gen/core/version.go b/cmd/xgo/runtime_gen/core/version.go
index 20b5c632..26e85d5e 100755
--- a/cmd/xgo/runtime_gen/core/version.go
+++ b/cmd/xgo/runtime_gen/core/version.go
@@ -7,8 +7,8 @@ import (
 )
 
 const VERSION = "1.0.35"
-const REVISION = "efe86afb9931162ad0926648c13c4109383beef3+1"
-const NUMBER = 223
+const REVISION = "904aef19ec01b2728dd491cbcfbb84667b42dd5e+1"
+const NUMBER = 224
 
 // these fields will be filled by compiler
 const XGO_VERSION = ""
diff --git a/cmd/xgo/runtime_gen/trace/trace.go b/cmd/xgo/runtime_gen/trace/trace.go
index 128db84a..25ac6cc7 100755
--- a/cmd/xgo/runtime_gen/trace/trace.go
+++ b/cmd/xgo/runtime_gen/trace/trace.go
@@ -20,8 +20,18 @@ import (
 var stackMap sync.Map        // uintptr(goroutine) -> *Root
 var testInfoMapping sync.Map // uintptr(goroutine) -> *testInfo
 
+// stack trace options:
+//
+//	on: automatically collect when test starts and ends
 var xgoStackTrace = os.Getenv("XGO_STACK_TRACE")
 
+// options:
+//
+//		true: stdlib is by default allowed
+//	 TODO: use compiler inserted flag instead of env
+var xgoStdlibTrapDefaulAllow = os.Getenv("XGO_STD_LIB_TRAP_DEFAULT_ALLOW")
+var collectStdlibTraceByDefault = xgoStdlibTrapDefaulAllow != "true"
+
 type testInfo struct {
 	name string
 
@@ -194,11 +204,18 @@ func setupInterceptor() func() {
 	}
 }
 
+// returns a value to besed by post
+// if returns err trap.ErrSkip, this interceptor is skipped, handleTracePost is not called, next interceptors will
+// be normally executed
+// if returns nil error, handleTracePost is called
 func handleTracePre(ctx context.Context, f *core.FuncInfo, args core.Object, results core.Object) (interface{}, error) {
 	if !__xgo_link_init_finished() {
 		// do not collect trace while init
 		return nil, trap.ErrSkip
 	}
+	if f.Stdlib && collectStdlibTraceByDefault {
+		return nil, trap.ErrSkip
+	}
 	key := uintptr(__xgo_link_getcurg())
 	localOptStack, ok := collectingMap.Load(key)
 	var localOpts *collectOpts
diff --git a/cmd/xgo/version.go b/cmd/xgo/version.go
index b94d7721..7a87b96b 100644
--- a/cmd/xgo/version.go
+++ b/cmd/xgo/version.go
@@ -3,8 +3,8 @@ package main
 import "fmt"
 
 const VERSION = "1.0.35"
-const REVISION = "efe86afb9931162ad0926648c13c4109383beef3+1"
-const NUMBER = 223
+const REVISION = "904aef19ec01b2728dd491cbcfbb84667b42dd5e+1"
+const NUMBER = 224
 
 func getRevision() string {
 	revSuffix := ""
diff --git a/patch/ctxt/stdlib.go b/patch/ctxt/stdlib.go
index 3e96d756..c23f641f 100644
--- a/patch/ctxt/stdlib.go
+++ b/patch/ctxt/stdlib.go
@@ -72,9 +72,10 @@ var stdBlocklist = map[string]map[string]bool{
 	"sync/atomic": map[string]bool{
 		"*": true,
 	},
-	"testing": map[string]bool{
-		"*": true,
-	},
+	// testing is not harmful
+	// "testing": map[string]bool{
+	// 	"*": true,
+	// },
 	"unsafe": map[string]bool{
 		"*": true,
 	},
diff --git a/runtime/core/version.go b/runtime/core/version.go
index 20b5c632..26e85d5e 100644
--- a/runtime/core/version.go
+++ b/runtime/core/version.go
@@ -7,8 +7,8 @@ import (
 )
 
 const VERSION = "1.0.35"
-const REVISION = "efe86afb9931162ad0926648c13c4109383beef3+1"
-const NUMBER = 223
+const REVISION = "904aef19ec01b2728dd491cbcfbb84667b42dd5e+1"
+const NUMBER = 224
 
 // these fields will be filled by compiler
 const XGO_VERSION = ""
diff --git a/runtime/trace/trace.go b/runtime/trace/trace.go
index 128db84a..25ac6cc7 100644
--- a/runtime/trace/trace.go
+++ b/runtime/trace/trace.go
@@ -20,8 +20,18 @@ import (
 var stackMap sync.Map        // uintptr(goroutine) -> *Root
 var testInfoMapping sync.Map // uintptr(goroutine) -> *testInfo
 
+// stack trace options:
+//
+//	on: automatically collect when test starts and ends
 var xgoStackTrace = os.Getenv("XGO_STACK_TRACE")
 
+// options:
+//
+//		true: stdlib is by default allowed
+//	 TODO: use compiler inserted flag instead of env
+var xgoStdlibTrapDefaulAllow = os.Getenv("XGO_STD_LIB_TRAP_DEFAULT_ALLOW")
+var collectStdlibTraceByDefault = xgoStdlibTrapDefaulAllow != "true"
+
 type testInfo struct {
 	name string
 
@@ -194,11 +204,18 @@ func setupInterceptor() func() {
 	}
 }
 
+// returns a value to besed by post
+// if returns err trap.ErrSkip, this interceptor is skipped, handleTracePost is not called, next interceptors will
+// be normally executed
+// if returns nil error, handleTracePost is called
 func handleTracePre(ctx context.Context, f *core.FuncInfo, args core.Object, results core.Object) (interface{}, error) {
 	if !__xgo_link_init_finished() {
 		// do not collect trace while init
 		return nil, trap.ErrSkip
 	}
+	if f.Stdlib && collectStdlibTraceByDefault {
+		return nil, trap.ErrSkip
+	}
 	key := uintptr(__xgo_link_getcurg())
 	localOptStack, ok := collectingMap.Load(key)
 	var localOpts *collectOpts
diff --git a/script/github-actions/main.go b/script/github-actions/main.go
index a674eb27..2b6ed58e 100644
--- a/script/github-actions/main.go
+++ b/script/github-actions/main.go
@@ -84,13 +84,13 @@ func checkMerge(args []string) error {
 		}
 	}
 	if !found {
-		return fmt.Errorf("%s cannot be merged into %s without creating intermediate commit", branch, targetBranch)
+		return fmt.Errorf("%s is not based on newest %s, please rebase with %s", branch, targetBranch, targetBranch)
 	}
 	if i == 0 {
-		return fmt.Errorf("%s is the same with %s", branch, targetBranch)
+		return fmt.Errorf("%s is same with %s, nothing to merge", branch, targetBranch)
 	}
 	if i != 1 {
-		return fmt.Errorf("expect 1 commit to be merged, actual: %d", i)
+		return fmt.Errorf("%s has %d commits to be merged into %s, please squash them into 1(using 'git reset --soft origin/%s')", branch, i, targetBranch, targetBranch)
 	}
 	return nil
 }