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From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date: Tue, 26 Mar 2024 12:56:50 -0400
Message-ID: <CABBYNZKDa9KR8A_4TbpPyiLWFFH22T=Z9jk7N=o6U+z1oB+7vg@mail.gmail.com>
Subject: Re: [REGRESSION] Oops during init in btintel_read_debug_features with
 today's mainline
To: Thorsten Leemhuis <linux@leemhuis.info>
Cc: Marcel Holtmann <marcel@holtmann.org>, 
	Linux kernel regressions list <regressions@lists.linux.dev>, 
	"linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>
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Hi Thorsten,

On Tue, Mar 26, 2024 at 4:44=E2=80=AFAM Thorsten Leemhuis <linux@leemhuis.i=
nfo> wrote:
>
> Lo! Just booted 6.9 for the first time and noticed the Bluetooth code
> causes an Oops (see below) during boot that did not happen with 6.8 and
> earlier. This is on Fedora 40 with a vanilla kernel on a Lenovo Thinkpad
> T14s Gen1 AMD.
>
> Do I need to bisect this? Or is this known already? Or does anyone by
> chance an idea what might cause this? Or is there some other way to get
> down to the problem?
>
> Ciao, Thorsten
>
> [Full dmesg: https://www.leemhuis.info/files/misc/dmesg-6.9-btprob]
>
> [   19.903869] Bluetooth: hci0: Found device firmware: intel/ibt-20-1-3.s=
fi
> [   19.903908] Bluetooth: hci0: Boot Address: 0x24800
> [   19.903913] Bluetooth: hci0: Firmware Version: 255-255.255
> [   19.906245] usb 6-4: USB disconnect, device number 3
> [   19.906364] usb 2-2: Found UVC 1.50 device Integrated Camera (04f2:b6c=
b)
> [   19.906583] Bluetooth: hci0: FW download error recovery failed (-19)
> [   19.906649] Bluetooth: hci0: sending frame failed (-19)
> [   19.906666] BUG: kernel NULL pointer dereference, address: 00000000000=
00070
> [   19.906672] #PF: supervisor read access in kernel mode
> [   19.906677] #PF: error_code(0x0000) - not-present page
> [   19.906681] PGD 0 P4D 0
> [   19.906688] Oops: 0000 [#1] PREEMPT SMP NOPTI
> [   19.906701] Hardware name: LENOVO 20UH001HGE/20UH001HGE, BIOS R1CET77W=
(1.46 ) 10/26/2023
> [   19.906706] Workqueue: hci0 hci_power_on [bluetooth]
> [   19.906775] RIP: 0010:btintel_read_debug_features (/usr/src/debug/[...=
]/drivers/bluetooth/btintel.c:1306) btintel

Seem like the following could be reason:

https://patchwork.kernel.org/project/bluetooth/patch/20240326164317.1460864=
-1-luiz.dentz@gmail.com/