Verifying that this fixed bluetooth regression introduced in 6.8.0-139.
Used 6.8.0-146.146 from noble-proposed.
Hardware: ASUS ROG STRIX B650E-I GAMING WIFI (BIOS 3057), MediaTek MT7922
USB ID: 0489:e0e2 (Foxconn / Hon Hai)
OS: Kubuntu 24.04.4, non-HWE linux-generic
6.8.0-138-generic: Bluetooth works
6.8.0-139-generic: "BUG: kernel NULL pointer dereference, address:
0000000000000219"
in btmtk_usb_hci_wmt_sync via usb_autopm_get_interface,
Workqueue hci0 hci_power_on. Reproduced on 3 of 3 boots.
A subsequent "modprobe -r btusb" hangs forever in
hci_unregister_dev -> cancel_work_sync (D state).
6.8.0-146-generic: Bluetooth initializes, no oops in dmesg, adapter usable.
$ uname -r
6.8.0-146-generic
$ journalctl -k -b 0 | grep -iE 'Device setup|BUG:'
Sep 11 17:37:21 pahvilaatikko kernel: Bluetooth: hci0: Device setup in 20336166
usecs
Sep 11 17:37:28 pahvilaatikko kernel: Bluetooth: hci0: Device setup in 163079
usecs
(The first setup above took 20336166 usecs = ~20 s. This is NOT related to
this bug, been like this before on 6.8.0-138 too. So ignore that.)
$ bluetoothctl show
Controller C8:A3:E8:C5:C4:0A (public)
Manufacturer: 0x0046 (70)
Version: 0x0b (11)
Powered: yes
$ cat /sys/module/btusb/initstate
live
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https://bugs.launchpad.net/bugs/2165873
Title:
Bluetooth fails to initialize due to a kernel NULL pointer error
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