netdev - Re: net/rfkill: WARNING in rfkill_fop

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Date:	Tue, 26 Jan 2016 11:08:08 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Dmitry Vyukov <dvyukov@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	João Paulo Rechi Vita <jprvita@...il.com>
Cc:	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: net/rfkill: WARNING in rfkill_fop_read

On Tue, 2016-01-26 at 10:55 +0100, Dmitry Vyukov wrote:
> Hello,
> 
> The following program triggers WARNING message in rfkill_fop_read:
> 
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 6975 at kernel/sched/core.c:7663
> __might_sleep+0x138/0x1a0()
> do not call blocking ops when !TASK_RUNNING; state=1 set at
> [<ffffffff81436e01>] prepare_to_wait_event+0x141/0x410
> kernel/sched/wait.c:210

>  [<     inline     >] rfkill_readable net/rfkill/core.c:1102

Yeah, this should not acquire the mutex ... but luckily it's not a
problem not to anyway, so it's easy to fix. Thanks! I'll send out a fix
once I've tested it.

> // autogenerated by syzkaller (http://github.com/google/syzkaller)

gotta love the raw mmap etc. :)

johannes