cmd/compile: mark instantiated functions from package runtime as norace

Fixes #60439

Change-Id: I09fcd2d3deb7f80ed012a769fdb6f53b09c0290b
Reviewed-on: https://go-review.googlesource.com/c/go/+/502895
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/noder/unified.go

@@ -118,6 +118,16 @@ func unified(m posMap, noders []*noder) {
 		}
 	}
 
+	// For functions originally came from package runtime,
+	// mark as norace to prevent instrumenting, see issue #60439.
+	for _, n := range target.Decls {
+		if fn, ok := n.(*ir.Func); ok {
+			if !base.Flag.CompilingRuntime && types.IsRuntimePkg(fn.Sym().Pkg) {
+				fn.Pragma |= ir.Norace
+			}
+		}
+	}
+
 	base.ExitIfErrors() // just in case
 }
 

src/runtime/export_test.go

@@ -1932,3 +1932,11 @@ func SetPinnerLeakPanic(f func()) {
 func GetPinnerLeakPanic() func() {
 	return pinnerLeakPanic
 }
+
+var testUintptr uintptr
+
+func MyGenericFunc[T any]() {
+	systemstack(func() {
+		testUintptr = 4
+	})
+}

src/runtime/gc_test.go

@@ -929,3 +929,7 @@ func TestMemoryLimitNoGCPercent(t *testing.T) {
 		t.Fatalf("expected %q, but got %q", want, got)
 	}
 }
+
+func TestMyGenericFunc(t *testing.T) {
+	runtime.MyGenericFunc[int]()
+}