diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index 038e4346660..9bebd30c431 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-1c3747d20789c73447ff71cbc739f7423c4bdf67
+156f5f0152797ac2afe5f23803aeb3c7b8f8418e
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/runtime/go-cgo.c b/libgo/runtime/go-cgo.c
index a36eac92704..610bcf5ec4e 100644
--- a/libgo/runtime/go-cgo.c
+++ b/libgo/runtime/go-cgo.c
@@ -41,6 +41,8 @@ syscall_cgocall ()
   if (runtime_needextram && runtime_cas (&runtime_needextram, 1, 0))
     runtime_newextram ();
 
+  runtime_lockOSThread();
+
   m = runtime_m ();
   ++m->ncgocall;
   g = runtime_g ();
@@ -70,6 +72,8 @@ syscall_cgocalldone ()
      _cgo_panic will already have exited syscall mode.  */
   if (g->status == Gsyscall)
     runtime_exitsyscall ();
+
+  runtime_unlockOSThread();
 }
 
 /* Call back from C/C++ code to Go code.  */