I'm seeing bluetoothd using 100% CPU permanently on 16.04, Xenial.
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https://bugs.launchpad.net/bugs/1511817
Title:
bluetoothd consumes 100% CPU when scanning for devices, system hangs
Status in bluez package in Ubuntu:
Confirmed
Bug description:
I'm trying to use the bluedevil wizard on Kubuntu 15.04 to add a new device
(BT headset). The scan window opens but no device is found.
Meanwhile, both cpu and memory usage start to increase until memory is 100%
full and the system hangs!
If I just kill bluedevil, then dbus-daemon keeps using 100% cpu, the only way
to stop it is by manually stopping the bluetooth service.
$ uname -a
Linux Home1 3.19.0-32-generic #37-Ubuntu SMP Wed Oct 21 10:23:06 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux
$ hciconfig -a
hci0: Type: BR/EDR Bus: USB
BD Address: 44:39:C4:19:43:C9 ACL MTU: 1022:8 SCO MTU: 183:5
DOWN
RX bytes:564 acl:0 sco:0 events:29 errors:0
TX bytes:358 acl:0 sco:0 commands:29 errors:0
Features: 0xff 0xfe 0x0d 0xfe 0xd8 0x7f 0x7b 0x8f
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF
Link mode: SLAVE ACCEPT
$ rfkill list
1: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
2: dell-bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
3: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
4: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
$ lsmod | grep blue
bluetooth 491520 23 bnep,ath3k,btusb,rfcomm
$ lsusb
Bus 004 Device 004: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications
Processor
Bus 004 Device 005: ID 0cf3:817a Atheros Communications, Inc.
Bus 004 Device 002: ID 8087:8000 Intel Corp.
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 003: ID 0c45:649d Microdia
Bus 003 Device 002: ID 8087:8008 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
$ lsusb -s 004:005 -v
Bus 004 Device 005: ID 0cf3:817a Atheros Communications, Inc.
Couldn't open device, some information will be missing
Device Descriptor:
bLength18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 224 Wireless
bDeviceSubClass 1 Radio Frequency
bDeviceProtocol 1 Bluetooth
bMaxPacketSize064
idVendor 0x0cf3 Atheros Communications, Inc.
idProduct 0x817a
bcdDevice0.02
iManufacturer 1
iProduct2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 177
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 4
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber0
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 224 Wireless
bInterfaceSubClass 1 Radio Frequency
bInterfaceProtocol 1 Bluetooth
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes3
Transfer TypeInterrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes2
Transfer TypeBulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes2
Transfer TypeBulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Interface Descriptor:
bLength 9
