diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 0692ab5a0d672341000d1697d7c308c566060fb4..42c317874cfa8d2703c13f3c44757a6f397459ac 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -304,6 +304,8 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
 	if (child->ptrace) {
 		child->exit_code = data;
 		dead = __ptrace_detach(current, child);
+		if (!child->exit_state)
+			wake_up_process(child);
 	}
 	write_unlock_irq(&tasklist_lock);