Re: After kernel update: connect/disconnect forever while attempting to auto-reconnect

From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: Alexandre Pereira Nunes <alexandre.nunes@gmail.com>
Cc: "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
Subject: Re: After kernel update: connect/disconnect forever while attempting to auto-reconnect
Date: Sat, 18 May 2019 19:30:18 +0300	[thread overview]
Message-ID: <CABBYNZKbWAaO9dTnHcV7vCYodRQYEZT8=PBws+=_iip-7Njo2w@mail.gmail.com> (raw)
In-Reply-To: <CANxMttCqEYDZOwTriLqC-q39+JhEJ9KCOsPhRqkjZwE1h-64Gg@mail.gmail.com>

Hi Alexandre,

On Sat, May 18, 2019 at 7:13 PM Alexandre Pereira Nunes
<alexandre.nunes@gmail.com> wrote:
>
> I've attached two btmon sessions: one captured from the text mode and
> another with -w param.
>
> Both on 5.1.2 kernel.

The problem seems to be here:

< ACL Data TX: Handle 512 flags 0x00 dlen 16                #87 [hci0] 9.952984
      L2CAP: Connection Response (0x03) ident 1 len 8
        Destination CID: 0
        Source CID: 65
        Result: Connection refused - security block (0x0003)
        Status: No further information available (0x0000)

Ruling out encryption since HID don't require it:

https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/profiles/input/server.c#n294

Are you seeing any of the following logs on the journal:

https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/profiles/input/server.c#n181

> Em sáb, 18 de mai de 2019 às 05:53, Carlos Pita
> <carlosjosepita@gmail.com> escreveu:
> >
> > Hi Luiz,
> >
> > I've attached the output for a single auto-reconnect/disconnect sequence.
> >
> > Notice this was using the 4.19.44 kernel, which is the LTS one in Arch
> > Linux. As I've pointed out above, the problem seems like a regression,
> > since it's happening both in older and latest kernels, but not
> > in-between them.
> >
> > Best regards
> > --
> > Carlos

-- 
Luiz Augusto von Dentz