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

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Message-ID: <de5d98be99086a7182ba2bd0676b261349a145c4.camel@sipsolutions.net>
Date: Tue, 17 Dec 2024 12:33:22 +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 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.

johannes