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

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Message-ID: <20141002110927.GE2849@worktop.programming.kicks-ass.net>
Date:	Thu, 2 Oct 2014 13:09:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	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>,
	Peter Hurley <peter@...leysoftware.com>
Subject: Re: [rfcomm_run] WARNING: CPU: 1 PID: 79 at kernel/sched/core.c:7156
 __might_sleep()

On Tue, Sep 30, 2014 at 04:02:28PM +0800, Fengguang Wu wrote:
> Hi Peter,
> 
> We possibly find a rfcomm bug (maintainers CCed) exposed by your debug patch
> 
> [    1.861895] NET: Registered protocol family 5
> [    1.862978] Bluetooth: RFCOMM TTY layer initialized
> [    1.863099] ------------[ cut here ]------------
> [    1.863105] WARNING: CPU: 1 PID: 79 at kernel/sched/core.c:7156 __might_sleep+0x17d/0x1a1()
> [    1.863112] do not call blocking ops when !TASK_RUNNING; state=1 set at [<c14dc381>] rfcomm_run+0xdf/0x130e
> [    1.863591]  [<c1058b73>] ? kthread_stop+0x53/0x53
> [    1.864906]  [<c155a411>] dump_stack+0x48/0x60
> [    1.866298]  [<c14dc381>] ? rfcomm_run+0xdf/0x130e

Ha yes, rfcomm_run is a complete buggy mess indeed. Lemme go see what I
can make of it.
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