Public bug reported:
Ubuntu 24.04.4, kernel 6.8.0-139-generic (Ubuntu 6.8.0-139.139-generic 6.8.12).
Lenovo 21A0004PFR, BIOS R1MET58W 1.28.
MediaTek MT7921 combo: BT on USB 0489:e0cd, WiFi on PCI 03:00.0 (mt7921e).
After upgrading from 6.8.0-138.138 to 6.8.0-139.139, Bluetooth is completely
unavailable. bluetoothctl lists no controller; bluetoothd starts fine but has
zero adapters. rfkill is unblocked, WiFi is unaffected.
The kernel Oopses during BT firmware setup, so hci0 never finishes
registering:
Bluetooth: hci0: HW/SW Version: 0x008a008a, Build Time: 20240219111427
BUG: kernel NULL pointer dereference, address: 0000000000000219
Oops: 0000 [#1] PREEMPT SMP NOPTI
RIP: 0010:__pm_runtime_resume+0x1b/0x80
Workqueue: hci0 hci_power_on [bluetooth]
Call Trace:
usb_autopm_get_interface+0x1d/0x60
btmtk_usb_hci_wmt_sync+0xa9/0x2e0 [btmtk]
btmtk_setup_firmware_79xx+0x1ca/0x360 [btmtk]
btusb_mtk_setup+0x453/0x610 [btusb]
hci_dev_setup_sync+0x6f/0x430 [bluetooth]
hci_dev_init_sync+0x3e/0x1c0 [bluetooth]
hci_dev_open_sync+0xb1/0x350 [bluetooth]
hci_dev_do_open+0x28/0x70 [bluetooth]
hci_power_on+0x50/0x210 [bluetooth]
note: kworker/u33:0[171] exited with irqs disabled
Reproducible on every boot (4 consecutive boots in the attached journal).
The MediaTek firmware files are present in /lib/firmware/mediatek, so this is
not missing firmware. Booting 6.8.0-138-generic is unaffected.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-139-generic 6.8.0-139.139
ProcVersionSignature: Ubuntu 6.8.0-139.139-generic 6.8.12
Uname: Linux 6.8.0-139-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 7 10:31:35 2026
InstallationDate: Installed on 2022-08-22 (1477 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Release amd64 (20220419)
MachineType: LENOVO 21A0004PFR
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-139-generic
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.8.0-139-generic N/A
linux-backports-modules-6.8.0-139-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/13/2024
dmi.bios.release: 1.28
dmi.bios.vendor: LENOVO
dmi.bios.version: R1MET58W (1.28 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21A0004PFR
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.28
dmi.modalias:
dmi:bvnLENOVO:bvrR1MET58W(1.28):bd08/13/2024:br1.28:efr1.28:svnLENOVO:pn21A0004PFR:pvrThinkPadP14sGen2a:rvnLENOVO:rn21A0004PFR:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21A0_BU_Think_FM_ThinkPadP14sGen2a:
dmi.product.family: ThinkPad P14s Gen 2a
dmi.product.name: 21A0004PFR
dmi.product.sku: LENOVO_MT_21A0_BU_Think_FM_ThinkPad P14s Gen 2a
dmi.product.version: ThinkPad P14s Gen 2a
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble regression-update
** Tags added: regression-update
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https://bugs.launchpad.net/bugs/2166656
Title:
MT7921 Bluetooth: NULL pointer dereference in btmtk_usb_hci_wmt_sync
on 6.8.0-139 (regression from 6.8.0-138)
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