linux-kernel - Re: WARNING: refcount bug in put

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Message-ID: <2024101515-helmet-stoic-1c97@gregkh>
Date: Tue, 15 Oct 2024 08:48:04 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Hui Guo <guohui.study@...il.com>
Cc: Alan Stern <stern@...land.harvard.edu>, Alex Elder <elder@...nel.org>,
	Aditya Garg <gargaditya08@...e.com>,
	Grant Grundler <grundler@...omium.org>,
	Kerem Karabay <kekrby@...il.com>,
	Douglas Anderson <dianders@...omium.org>,
	Oliver Neukum <oneukum@...e.com>, Yajun Deng <yajun.deng@...ux.dev>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	syzkaller-bugs@...glegroups.com
Subject: Re: WARNING: refcount bug in put_device

On Tue, Oct 15, 2024 at 02:37:47PM +0800, Hui Guo wrote:
> Hi Kernel Maintainers,
> we found a crash "WARNING: refcount bug in put_device" in upstream, we
> also have successfully reproduced it manually:
> 
> HEAD Commit: 9852d85ec9d492ebef56dc5f229416c925758edc(tag 'v6.12-rc1')
> kernel config: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/6.12.config
> 
> console output:
> https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/9852d85ec9d492ebef56dc5f229416c925758edc/83e10c2b482009dbb3b32ece907dcc361978f9b9/log0
> repro report: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/9852d85ec9d492ebef56dc5f229416c925758edc/83e10c2b482009dbb3b32ece907dcc361978f9b9/repro.report
> syz reproducer:
> https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/9852d85ec9d492ebef56dc5f229416c925758edc/83e10c2b482009dbb3b32ece907dcc361978f9b9/repro.prog
> c reproducer: https://raw.githubusercontent.com/androidAppGuard/KernelBugs/main/9852d85ec9d492ebef56dc5f229416c925758edc/83e10c2b482009dbb3b32ece907dcc361978f9b9/repro.cprog

As this is using a "fake" yealink device, odds are there's some
reference counting bug on the disconnect path that you have found.  Care
to send a patch to fix it up as you can test it easily?

thanks,

greg k-h