linux-kernel - Re: [Bug] Deadlock between rfkill_fop_write() and nfc_unregister

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Message-ID: <CAEkJfYP297P=RjvZ9-ctpYHXu7bDhVN0+ZBoMNz2xjzyqOakLQ@mail.gmail.com>
Date: Tue, 17 Dec 2024 20:01:03 +0800
From: Sam Sun <samsun1006219@...il.com>
To: Johannes Berg <johannes@...solutions.net>
Cc: linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org, 
	netdev@...r.kernel.org, Simon Horman <horms@...nel.org>, pabeni@...hat.com, 
	kuba@...nel.org, Eric Dumazet <edumazet@...gle.com>, davem@...emloft.net, krzk@...nel.org
Subject: Re: [Bug] Deadlock between rfkill_fop_write() and nfc_unregister_device()

On Tue, Dec 17, 2024 at 7:33 PM Johannes Berg <johannes@...solutions.net> wrote:
>
> On Tue, 2024-12-17 at 11:46 +0100, Johannes Berg wrote:
> > On Tue, 2024-12-17 at 17:33 +0800, Sam Sun wrote:
> > > Dear developers and maintainers,
> > >
> > > We originally encountered a task hung while using our modified
> > > syzkaller. It was tested against the latest upstream kernel. We
> > > analyzed the root cause and pinpoint the kernel crash log to the
> > > following two tasks.
> > >
> >
> > This issue has been known a very long time and should be fixed in NFC,
> > but I guess nobody is around to do it.
> >
> > https://syzkaller.appspot.com/bug?extid=bb540a4bbfb4ae3b425d
> >
>
> I think this one is also the same:
>
> https://syzkaller.appspot.com/bug?extid=9ef743bba3a17c756174
>
> and that's much older still.
>

Thanks for your quick reply! I am sorry that I didn't double-check the
call stack of historical bugs reported by Syzbot. I will be careful
next time.

Best,
Yue