diff --git a/[refs] b/[refs]
index 83ccc1e05d45..c24f0e9c06ed 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f1c7404e37a8970bd58cc10a6d96534d42b9aac6
+refs/heads/master: 86d6f2bf61eb2a28fa63c0a19330d36226426477
diff --git a/trunk/arch/um/kernel/ptrace.c b/trunk/arch/um/kernel/ptrace.c
index 15e8b7c4de13..8e3d69e4fcb5 100644
--- a/trunk/arch/um/kernel/ptrace.c
+++ b/trunk/arch/um/kernel/ptrace.c
@@ -64,6 +64,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 		ret = poke_user(child, addr, data);
 		break;
 
+	case PTRACE_SYSEMU:
+	case PTRACE_SYSEMU_SINGLESTEP:
+		ret = -EIO;
+		break;
+
 	/* continue and stop at next (return from) syscall */
 	case PTRACE_SYSCALL:
 	/* restart after signal. */