--- kernel/ptrace.c

+++ kernel/ptrace.c

@@ -314,7 +314,7 @@ int ptrace_detach(struct task_struct *ch

child->exit_code = data;

dead = __ptrace_detach(current, child);

if (!child->exit_state)

- wake_up_process(child);

+ wake_up_state(child, TASK_TRACED | TASK_STOPPED);

}

write_unlock_irq(&tasklist_lock);