diff --git a/[refs] b/[refs]
index 86ddbf9d562a..388c4f64f9a7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b1b4c6799fb59e710454bfe0ab477cb8523a8667
+refs/heads/master: 4576145c1ecdaaea9ef8976a48335206aa1ebf91
diff --git a/trunk/include/linux/ptrace.h b/trunk/include/linux/ptrace.h
index 98b93ca4db06..1a2b0cb55535 100644
--- a/trunk/include/linux/ptrace.h
+++ b/trunk/include/linux/ptrace.h
@@ -94,6 +94,7 @@ extern void ptrace_notify(int exit_code);
 extern void __ptrace_link(struct task_struct *child,
 			  struct task_struct *new_parent);
 extern void __ptrace_unlink(struct task_struct *child);
+extern int __ptrace_detach(struct task_struct *tracer, struct task_struct *p);
 extern void ptrace_fork(struct task_struct *task, unsigned long clone_flags);
 #define PTRACE_MODE_READ   1
 #define PTRACE_MODE_ATTACH 2
diff --git a/trunk/kernel/ptrace.c b/trunk/kernel/ptrace.c
index f62a568e84ec..ee553b6ad125 100644
--- a/trunk/kernel/ptrace.c
+++ b/trunk/kernel/ptrace.c
@@ -237,6 +237,8 @@ int ptrace_attach(struct task_struct *task)
 
 int ptrace_detach(struct task_struct *child, unsigned int data)
 {
+	int dead = 0;
+
 	if (!valid_signal(data))
 		return -EIO;
 
@@ -244,18 +246,21 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
 	ptrace_disable(child);
 	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 
-	/* protect against de_thread()->release_task() */
 	write_lock_irq(&tasklist_lock);
+	/* protect against de_thread()->release_task() */
 	if (child->ptrace) {
 		child->exit_code = data;
 
-		__ptrace_unlink(child);
+		dead = __ptrace_detach(current, child);
 
 		if (!child->exit_state)
 			wake_up_process(child);
 	}
 	write_unlock_irq(&tasklist_lock);
 
+	if (unlikely(dead))
+		release_task(child);
+
 	return 0;
 }