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From:   Arda Demir <ddmirarda@gmail.com>
Date:   Sat, 11 Feb 2023 14:48:08 +0300
Message-ID: <CALDHRCt4cpbpCLyd4g+2+Lh2H8WikJMXUBv6GfEcjz6Vi12yig@mail.gmail.com>
Subject: Re: hci0: Malformed MSFT vendor event: 0x02
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc:     pmenzel@molgen.mpg.de, linux-bluetooth@vger.kernel.org
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On Wed, 2023-02-08 at 12:21 +0300, Arda Demir wrote:
> Hello,
>
> First of all, my bluetooth adapter is;
> 04:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)
>
> I see the following message everytime when i boot the pc on tty.
>
> "Bluetooth: hci0: Malformed MSFT vendor event: 0x02"
>
> But bluetooth works well. If it is not critical it shouldn't print on
> tty, right?

On Wed, Feb 8, 2023 at 12:29 PM Johannes Berg <johannes@sipsolutions.net> wrote:
>
> On Wed, 2023-02-08 at 12:21 +0300, Arda Demir wrote:
> > Hello,
> >
> > First of all, my bluetooth adapter is;
> > 04:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)
>
> You've reached the Wi-Fi team here though - adding the BT list.
>
> > I see the following message everytime when i boot the pc on tty.
> >
> > "Bluetooth: hci0: Malformed MSFT vendor event: 0x02"
> >
> > But bluetooth works well. If it is not critical it shouldn't print on
> > tty, right?
>
> That's generic from net/bluetooth/hci_event.c, not related to the device
> (apart from the fact that the device might be broken if it's sending
> this?)
>
> johannes
>

On Wed, Feb 8, 2023 at 2:00 AM Arda Demir <ddmirarda@gmail.com> wrote:
>
> I don't think the device is broken since bluetooth + wi-fi is fully
> functional and i also read on arch linux forum people get the same
> message on tty with the same hardware. (AX200)
>
> https://bbs.archlinux.org/viewtopic.php?id=276815

On Wed, Feb 8, 2023 at 1:17 PM Paul Menzel <pmenzel@molgen.mpg.de> wrote:
>
> The message seems to originate from `net/bluetooth/msft.c`:
>
> ...
>
> ```
> static void *msft_skb_pull(struct hci_dev *hdev, struct sk_buff *skb,
>                             u8 ev, size_t len)
> {
>          void *data;
>
>          data = skb_pull_data(skb, len);
>          if (!data)
>                  bt_dev_err(hdev, "Malformed MSFT vendor event: 0x%02x",
> ev);
>
>          return data;
> }
> ```
>
> I recommend to create a bug report at the Linux kernel Bugzilla [1],
> where you attach the output of `dmesg`.
>
> Additionally, I suggest to not load the Bluetooth modules like btusb
> during startup, and only later load it with `btmon` running.
>
> Please reply with the bug report number/URL, if you created the bug report.
>
>
> Kind regards,
>
> Paul
>
>
> [1]: https://bugzilla.kernel.org/

On Thu, Feb 9, 2023 at 2:43 AM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> Hi Arda,
>
> On Wed, Feb 8, 2023 at 2:00 AM Arda Demir <ddmirarda@gmail.com> wrote:
> > I don't think the device is broken since bluetooth + wi-fi is fully
> > functional and i also read on arch linux forum people get the same
> > message on tty with the same hardware. (AX200)
> >
> > https://bbs.archlinux.org/viewtopic.php?id=276815
>
> I suspect it is some vendor event other than MSFT that we are trying
> to parse as MSFT, this normally can be ignored silently when not
> understood, but I will check internally what we can do about it.

I've created a bug report about this:
https://bugzilla.kernel.org/show_bug.cgi?id=217023