Re: WARNING: refcount bug in put_device

[Greg Kroah-Hartman]

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