[Bug 1910405] Re: Intel Bluetooth AX200 [8086:2723] Subsystem [1a56:1653]: bluetoothd hangs and cannot be killed

[Expired for bluez (Ubuntu) because there has been no activity for 60
days.]

** Changed in: bluez (Ubuntu)
Status: Incomplete => Expired

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Title:
Intel Bluetooth AX200 [8086:2723] Subsystem [1a56:1653]: bluetoothd
hangs and cannot be killed

Status in bluez package in Ubuntu:
Expired
Status in linux package in Ubuntu:
Expired

Bug description:
Hi,

When having a bluetooth headphone (JBL Live) connected using the A2DP
pulseaudio sink, the output sound suddenly stops during a music
streaming of videocall session. Sometimes just disconnecting and
reconnecting the headphone works, but some times reconnection is not
possible anymore due to the hanging of bluetoothd. Bluetoothd still
appears in the processes list, but cannot be killed, neither with
"sudo service bluetooth stop" or "kill -9":

$ ps afx | grep blue
9597 tty2 Sl+ 0:01 | \_ gnome-control-center bluetooth
5405 ? Ss 0:00 \_ /usr/lib/bluetooth/obexd
10694 pts/0 S+ 0:00 \_ grep blue
20548 ? Ds 0:03 /usr/lib/bluetooth/bluetoothd

All programs keep working normally, only bluetooth is affected as well
as the bluetooth settings page.

The only solution is a hard reboot. A soft reboot doesn't even work:
the systems keeps trying to end the bluetoothd process so one needs to
press the power button for a few seconds to terminate the process.

$ bluetoothd --version
5.48

$ uname -a
Linux omer 5.4.0-58-generic #64~18.04.1-Ubuntu SMP Wed Dec 9 17:11:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Using Ubuntu 18.04.5 LTS preinstalled on a Dell XPS13, which has been working nice for over one year now just like previous versions.
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.21
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistributionChannelDescriptor:
# This is the distribution channel descriptor for the OEM CDs
# For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
canonical-oem-somerville-bionic-amd64-20180608-47+beaver-three-eyed-raven+X92
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2019-11-22 (415 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: Dell Inc. XPS 13 7390
Package: linux
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-59-generic root=UUID=d3a4ed7f-d7f9-494e-91ed-554159c1b8ae ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 5.4.0-59.65~18.04.1-generic 5.4.78
Tags: bionic
Uname: Linux 5.4.0-59-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo vboxusers
_MarkForUpload: True
dmi.bios.date: 10/22/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.7.0
dmi.board.name: 0G2D0W
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.7.0:bd10/22/2020:svnDellInc.:pnXPS137390:pvr:rvnDellInc.:rn0G2D0W:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 7390
dmi.product.sku: 0962
dmi.sys.vendor: Dell Inc.
hciconfig:
hci0: Type: Primary Bus: USB
BD Address: 4C:1D:96:DA:70:EA ACL MTU: 1021:4 SCO MTU: 96:6
DOWN
RX bytes:4127584 acl:43 sco:9279 events:521650 errors:0
TX bytes:340220846 acl:518394 sco:8547 commands:3166 errors:0

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