[Bug 219992] New: Linux logs warning `Bluetooth: hci0: SCO packet for unknown connection handle 3`

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219992

            Bug ID: 219992
           Summary: Linux logs warning `Bluetooth: hci0: SCO packet for
                    unknown connection handle 3`
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: pmenzel+bugzilla.kernel.org@molgen.mpg.de
        Regression: No

Using Linux 6.15-rc1 with Debian sid/unstable with *bluez* 5.79-2 and a JBL GO
2 speaker, Linux logs the warnings below:

    [27836.585885] Bluetooth: hci0: SCO packet for unknown connection handle 3
    [27836.585889] Bluetooth: hci0: SCO packet for unknown connection handle 3
    [27836.585893] Bluetooth: hci0: SCO packet for unknown connection handle 3

I haven’t seen this before, but I also do not use the box that often.

Also, I cannot find out, if it’s related to the box shutting down to
inactivity.

```
Apr 07 08:30:45.389947 abreu kernel: Linux version 6.15.0-rc1
(build@bohemianrhapsody.molgen.mpg.de) (gcc (Debian 14.2.0-19) 14.2.0, GNU ld
(GNU Binutils for Debian) 2.44) #19 SMP PREEMPT_DYNAMIC Mon Apr  7 08:17
:41 CEST 2025
[…]
Apr 07 08:30:45.391407 abreu kernel: DMI: Dell Inc. XPS 13 9360/0596KF, BIOS
2.21.0 06/02/2022
[…]
Apr 07 08:30:46.920819 abreu kernel: Bluetooth: Core ver 2.22
Apr 07 08:30:46.920859 abreu kernel: Bluetooth: HCI device and connection
manager initialized
Apr 07 08:30:46.920903 abreu kernel: Bluetooth: HCI socket layer initialized
Apr 07 08:30:46.920922 abreu kernel: Bluetooth: L2CAP socket layer initialized
Apr 07 08:30:46.920945 abreu kernel: Bluetooth: SCO socket layer initialized
Apr 07 08:30:47.008583 abreu kernel: Bluetooth: hci0: using rampatch file:
qca/rampatch_usb_00000302.bin
Apr 07 08:30:47.008779 abreu kernel: Bluetooth: hci0: QCA: patch rome 0x302
build 0x3e8, firmware rome 0x302 build 0x111
[…]
Apr 07 17:55:46.519507 abreu wireplumber[1450]: spa.bluez5.native: RFCOMM
receive command but modem not available: AT+CHLD=?
Apr 07 17:55:46.567877 abreu wireplumber[1450]: spa.bluez5.native: RFCOMM
receive command but modem not available: AT+BTRH?
Apr 07 17:55:46.743477 abreu wireplumber[1450]: spa.bluez5.native: RFCOMM
receive command but modem not available: AT+XEVENT=0,0
Apr 07 17:55:46.771757 abreu wireplumber[1450]: spa.bluez5.native: RFCOMM
receive command but modem not available: AT+NREC=0
Apr 07 17:55:48.735757 abreu gsd-media-keys[1713]: Unable to get default sink
Apr 07 17:55:48.798996 abreu kernel: Bluetooth: hci0: SCO packet for unknown
connection handle 3
Apr 07 17:55:48.799164 abreu kernel: Bluetooth: hci0: SCO packet for unknown
connection handle 3
Apr 07 17:55:49.167305 abreu bluetoothd[99290]:
/org/bluez/hci0/dev_70_99_1C_BB_23_4E/sep1/fd1: fd(29) ready
Apr 07 17:55:49.183109 abreu bluetoothd[99290]:
profiles/audio/avctp.c:uinput_create() Can't open input device: No such file or
directory (2)
Apr 07 17:55:49.183121 abreu bluetoothd[99290]:
profiles/audio/avctp.c:init_uinput() AVRCP: failed to init uinput for JBL GO 2
[…]
Apr 07 18:14:52.872325 abreu bluetoothd[99290]: Player unregistered:
sender=:1.64 path=/_1_109
[…]
Apr 07 18:25:01.645509 abreu CRON[102993]: pam_unix(cron:session): session
closed for user root
Apr 07 18:25:52.495118 abreu kernel: Bluetooth: hci0: SCO packet for unknown
connection handle 3
Apr 07 18:25:52.495629 abreu kernel: usb 4-1.3: USB disconnect, device number 4
Apr 07 18:25:52.623048 abreu kernel: usb 3-1.3: USB disconnect, device number 4
Apr 07 18:25:52.954533 abreu kernel: usb 3-1.3.3: USB disconnect, device number
6
Apr 07 18:25:52.955123 abreu kernel: usb 3-1.3.4: USB disconnect, device number
7
Apr 07 18:30:03.815634 abreu bluetoothd[99290]:
src/profile.c:ext_io_disconnected() Unable to get io data for Hands-Free Voice
gateway: getpeername: Transport endpoint is not connected (107)
Apr 07 18:30:03.836632 abreu dbus-daemon[693]: [system] Rejected send message,
0 matched rules; type="method_return", sender=":1.71" (uid=5272 pid=1450
comm="/usr/bin/wireplumber") interface="(unset)" member="(unset)" error
name="(unset)" requested_reply="0" destination=":1.384" (uid=0 pid=99290
comm="/usr/libexec/bluetooth/bluetoothd")
Apr 07 18:30:03.838911 abreu gsd-media-keys[1713]: Unable to get default sink
```

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