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[Bug 1511817] Re: bluetoothd consumes 100% CPU when scanning for devices, system hangs

 

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: bluez (Ubuntu)
       Status: New => Confirmed

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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:
    bLength                18
    bDescriptorType         1
    bcdUSB               1.10
    bDeviceClass          224 Wireless
    bDeviceSubClass         1 Radio Frequency
    bDeviceProtocol         1 Bluetooth
    bMaxPacketSize0        64
    idVendor           0x0cf3 Atheros Communications, Inc.
    idProduct          0x817a 
    bcdDevice            0.02
    iManufacturer           1 
    iProduct                2 
    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
        bInterfaceNumber        0
        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
          bmAttributes            3
            Transfer Type            Interrupt
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0010  1x 16 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x82  EP 2 IN
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0040  1x 64 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x02  EP 2 OUT
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0040  1x 64 bytes
          bInterval               1
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        1
        bAlternateSetting       0
        bNumEndpoints           2
        bInterfaceClass       224 Wireless
        bInterfaceSubClass      1 Radio Frequency
        bInterfaceProtocol      1 Bluetooth
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x83  EP 3 IN
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0000  1x 0 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0000  1x 0 bytes
          bInterval               1
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        1
        bAlternateSetting       1
        bNumEndpoints           2
        bInterfaceClass       224 Wireless
        bInterfaceSubClass      1 Radio Frequency
        bInterfaceProtocol      1 Bluetooth
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x83  EP 3 IN
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0009  1x 9 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0009  1x 9 bytes
          bInterval               1
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        1
        bAlternateSetting       2
        bNumEndpoints           2
        bInterfaceClass       224 Wireless
        bInterfaceSubClass      1 Radio Frequency
        bInterfaceProtocol      1 Bluetooth
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x83  EP 3 IN
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0011  1x 17 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0011  1x 17 bytes
          bInterval               1
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        1
        bAlternateSetting       3
        bNumEndpoints           2
        bInterfaceClass       224 Wireless
        bInterfaceSubClass      1 Radio Frequency
        bInterfaceProtocol      1 Bluetooth
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x83  EP 3 IN
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0019  1x 25 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0019  1x 25 bytes
          bInterval               1
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        1
        bAlternateSetting       4
        bNumEndpoints           2
        bInterfaceClass       224 Wireless
        bInterfaceSubClass      1 Radio Frequency
        bInterfaceProtocol      1 Bluetooth
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x83  EP 3 IN
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0021  1x 33 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0021  1x 33 bytes
          bInterval               1
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        1
        bAlternateSetting       5
        bNumEndpoints           2
        bInterfaceClass       224 Wireless
        bInterfaceSubClass      1 Radio Frequency
        bInterfaceProtocol      1 Bluetooth
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x83  EP 3 IN
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0031  1x 49 bytes
          bInterval               1
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            1
            Transfer Type            Isochronous
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0031  1x 49 bytes
          bInterval               1

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