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

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Message-ID: <b27dc4d0c3456c6796437b26b887b931d9871977.camel@sipsolutions.net>
Date: Tue, 17 Dec 2024 11:46:36 +0100
From: Johannes Berg <johannes@...solutions.net>
To: Sam Sun <samsun1006219@...il.com>, 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, 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

johannes