linux-kernel - Re: [rfcomm_run] WARNING: CPU: 1 PID: 79 at kernel/sched/core.c:7156 __might

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Date:	Thu, 02 Oct 2014 10:16:27 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>,
	Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>,
	linux-kernel@...r.kernel.org,
	Marcel Holtmann <marcel@...tmann.org>, oleg@...hat.com
Subject: Re: [rfcomm_run] WARNING: CPU: 1 PID: 79 at kernel/sched/core.c:7156
 __might_sleep()

On 10/02/2014 09:58 AM, Peter Zijlstra wrote:
> On Thu, Oct 02, 2014 at 03:52:50PM +0200, Peter Zijlstra wrote:
>>> If yes, then wakeups from signals don't work either, right?
>>
>> Its a kthread, there should not be any signals.
> 
> That said, in the tty patch we do appear to have this problem.

That's what I meant. And the module load patch too.

> Oleg, do we want something like the below on top to make that work
> again?
> 
> ---
> --- a/kernel/sched/wait.c
> +++ b/kernel/sched/wait.c
> @@ -326,8 +326,10 @@ long wait_woken(wait_queue_t *wait, unsi
>  	 * woken_wake_function() such that if we observe WQ_FLAG_WOKEN we must
>  	 * also observe all state before the wakeup.
>  	 */
> -	if (!(wait->flags & WQ_FLAG_WOKEN))
> -		timeout = schedule_timeout(timeout);
> +	if (!(wait->flags & WQ_FLAG_WOKEN)) {
> +		if (___wait_is_interruptible(mode) && !signal_pending_state(mode, current))
> +			timeout = schedule_timeout(timeout);
> +	}
>  	__set_current_state(TASK_RUNNING);
>  
>  	/*
> 

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