linux-kernel - Is this a kernel bug?

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Message-ID: <CADCVGbSC-T=W08xcf9rDynS8Uf9yq=KKTNUn33g-O_FqyQkU_A@mail.gmail.com>
Date:	Sat, 3 Nov 2012 16:03:21 +0800
From:	Cyberman Wu <cypher.w@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Is this a kernel bug?

Recent days we got a exception in kernel thread [kworker/n:m], but
exception handler
call do_group_exit() -> do_exit() -> schedule() and got another
exception in schedule():
			/*
			 * If a worker is going to sleep, notify and
			 * ask workqueue whether it wants to wake up a
			 * task to maintain concurrency.  If so, wake
			 * up the task.
			 */
			if (prev->flags & PF_WQ_WORKER) {
				struct task_struct *to_wakeup;

				to_wakeup = wq_worker_sleeping(prev, cpu);
				if (to_wakeup)
					try_to_wake_up_local(to_wakeup);
			}

Exception occurred while wq_worker_sleeping() -> kthread_data().

It's because do_exit() -> exit_mm() -> mm_release():
	/* notify parent sleeping on vfork() */
	if (vfork_done) {
		tsk->vfork_done = NULL;
		complete(vfork_done);
	}

I'm using a patched version of kernel 2.6.38.8. But I've checked code
of kernel version 3.6.5,
it seems have the same process, only with files and functions split.

-- 
Cyberman Wu
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