linux-kernel - Fwd: Bluetooth LE scan doesn't show device name

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Date:   Tue, 8 Aug 2023 20:44:36 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        TatriX <tatrics@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux Bluetooth <linux-bluetooth@...r.kernel.org>,
        Linux Kernel Build System <linux-kbuild@...r.kernel.org>
Subject: Fwd: Bluetooth LE scan doesn't show device name

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> Hi!
> At some point after kernel 5.9 I started having issues with LE device scanning.
> Here's how it used to work:
> 
>     $ bluetoothctl
>     # power on
>     # scan on
>      ...
>     [NEW] Device 68:71:DD:73:97:D5 Playfinity-2
> 
> It successfully finds my device and it's name.
> On a newer kernel instead I'm getting no name:
> 
>     [NEW] Device 4D:18:19:A8:63:B5 4D-18-19-A8-63-B5
> 
> Here's corresponding btmon logs. First from kernel 5.9.12 that can see device's name:
> 
> ```5.9.12
>> HCI Event: LE Meta Event (0x3e) plen 33                  #118 [hci0] 5.607028
>       LE Extended Advertising Report (0x0d)
>         Num reports: 1
>         Entry 0
>           Event type: 0x0013
>             Props: 0x0013
>               Connectable
>               Scannable
>               Use legacy advertising PDUs
>             Data status:  [0;32mComplete [0m
>           Legacy PDU Type: ADV_IND (0x0013)
>           Address type: Random (0x01)
>           Address: 68:71:DD:73:97:D5 (Resolvable)
>           Primary PHY: LE 1M
>           Secondary PHY: No packets
>           SID: no ADI field (0xff)
>           TX power: 127 dBm
>           RSSI: -54 dBm (0xca)
>           Periodic advertising interval: 0.00 msec (0x0000)
>           Direct address type: Public (0x00)
>           Direct address: 00:00:00:00:00:00 (OUI 00-00-00)
>           Data length: 0x07
>         02 01 06 03 02 f0 ff                             .......
>         Flags: 0x06
>           LE General Discoverable Mode
>           BR/EDR Not Supported
>         16-bit Service UUIDs (partial): 1 entry
>           Unknown (0xfff0)
>> HCI Event: LE Meta Event (0x3e) plen 49                  #119 [hci0] 5.608029
>       LE Extended Advertising Report (0x0d)
>         Num reports: 1
>         Entry 0
>           Event type: 0x001b
>             Props: 0x001b
>               Connectable
>               Scannable
>               Scan response
>               Use legacy advertising PDUs
>             Data status:  [0;32mComplete [0m
>           Legacy PDU Type: SCAN_RSP to an ADV_SCAN_IND (0x001b)
>           Address type: Random (0x01)
>           Address: 68:71:DD:73:97:D5 (Resolvable)
>           Primary PHY: LE 1M
>           Secondary PHY: No packets
>           SID: no ADI field (0xff)
>           TX power: 127 dBm
>           RSSI: -54 dBm (0xca)
>           Periodic advertising interval: 0.00 msec (0x0000)
>           Direct address type: Public (0x00)
>           Direct address: 00:00:00:00:00:00 (OUI 00-00-00)
>           Data length: 0x17
>         0d 09 50 6c 61 79 66 69 6e 69 74 79 2d 32 02 0a  ..Playfinity-2..
>         00 05 12 50 00 68 00                             ...P.h.
>         Name (complete): Playfinity-2
>         TX power: 0 dBm
>         Peripheral Conn. Interval: 0x0050 - 0x0068
> ```
> 
> And from 6.4.8:
> 
> ```6.4.8
>> HCI Event: LE Meta Event (0x3e) plen 33                  #130 [hci0] 9.180207
>       LE Extended Advertising Report (0x0d)
>         Num reports: 1
>         Entry 0
>           Event type: 0x0013
>             Props: 0x0013
>               Connectable
>               Scannable
>               Use legacy advertising PDUs
>             Data status: �[0;32mComplete�[0m
>           Legacy PDU Type: ADV_IND (0x0013)
>           Address type: Random (0x01)
>           Address: 4D:18:19:A8:63:B5 (Resolvable)
>           Primary PHY: LE 1M
>           Secondary PHY: No packets
>           SID: no ADI field (0xff)
>           TX power: 127 dBm
>           RSSI: -53 dBm (0xcb)
>           Periodic advertising interval: 0.00 msec (0x0000)
>           Direct address type: Public (0x00)
>           Direct address: 00:00:00:00:00:00 (OUI 00-00-00)
>           Data length: 0x07
>         02 01 06 03 02 f0 ff                             .......
>         Flags: 0x06
>           LE General Discoverable Mode
>           BR/EDR Not Supported
>         16-bit Service UUIDs (partial): 1 entry
>           Unknown (0xfff0)
> ```
> 
> I've tried compiling 5.9.12 to see if I can bissect, but it fails to compile with gcc12..
> 
> Is it expected that newer kernels can't get device name? Perhaps some additional action is needed fetch it?
>  
> Thanks!

See Bugzilla for the full thread.

TatriX: Can you also attach dmesg output to your Bugzilla report?
Since you also have kernel build problem, can you also attach build
log (``make 2>&1 | tee build.log``)?

Anyway, I'm adding this regression to be tracked by regzbot:

#regzbot introduced: v5.9..v6.4 https://bugzilla.kernel.org/show_bug.cgi?id=217773

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217773

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