Created attachment 296671 [details] kernel dmesg (5.12.1, AMD FX-8370) Got this while plugging in my USB bluetooth dongle (ASUS USB-BT500): [...] ====================================================== WARNING: possible circular locking dependency detected 5.12.1-gentoo-bdver2 #2 Not tainted ------------------------------------------------------ bluetoothd/547 is trying to acquire lock: ffff9f6854610078 (&hdev->lock){+.+.}-{3:3}, at: hci_conn_get_phy+0x18/0x150 [bluetooth] but task is already holding lock: ffff9f673830c920 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: l2cap_sock_getsockopt+0x8e/0x6a0 [bluetooth] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}: lock_sock_nested+0x58/0x80 l2cap_sock_new_connection_cb+0x14/0xa8 [bluetooth] l2cap_connect+0x1be/0x5d8 [bluetooth] l2cap_recv_frame+0xf6a/0x3288 [bluetooth] process_pending_rx+0x26/0x40 [bluetooth] process_one_work+0x26b/0x578 worker_thread+0x4d/0x3b0 kthread+0x132/0x150 ret_from_fork+0x22/0x30 -> #2 (&chan->lock/2){+.+.}-{3:3}: __mutex_lock+0x6f/0x868 l2cap_connect_cfm+0x14d/0x420 [bluetooth] hci_remote_ext_features_evt.isra.0+0x15a/0x2b8 [bluetooth] hci_event_packet+0x10ad/0x2c08 [bluetooth] hci_rx_work+0x267/0x620 [bluetooth] process_one_work+0x26b/0x578 worker_thread+0x4d/0x3b0 kthread+0x132/0x150 ret_from_fork+0x22/0x30 -> #1 (hci_cb_list_lock){+.+.}-{3:3}: __mutex_lock+0x6f/0x868 hci_event_packet+0xcd8/0x2c08 [bluetooth] hci_rx_work+0x267/0x620 [bluetooth] process_one_work+0x26b/0x578 worker_thread+0x4d/0x3b0 kthread+0x132/0x150 ret_from_fork+0x22/0x30 -> #0 (&hdev->lock){+.+.}-{3:3}: __lock_acquire+0x146e/0x2628 lock_acquire+0xc4/0x390 __mutex_lock+0x6f/0x868 hci_conn_get_phy+0x18/0x150 [bluetooth] l2cap_sock_getsockopt+0x4fd/0x6a0 [bluetooth] __sys_getsockopt+0x88/0x1c0 __x64_sys_getsockopt+0x1c/0x20 do_syscall_64+0x33/0x48 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: &hdev->lock --> &chan->lock/2 --> sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP); lock(&chan->lock/2); lock(sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP); lock(&hdev->lock); *** DEADLOCK *** 1 lock held by bluetoothd/547: #0: ffff9f673830c920 (sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP){+.+.}-{0:0}, at: l2cap_sock_getsockopt+0x8e/0x6a0 [bluetooth] stack backtrace: CPU: 3 PID: 547 Comm: bluetoothd Not tainted 5.12.1-gentoo-bdver2 #2 Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./970-GAMING, BIOS F2 04/06/2016 Call Trace: dump_stack+0x7f/0xad check_noncircular+0x106/0x120 __lock_acquire+0x146e/0x2628 lock_acquire+0xc4/0x390 ? hci_conn_get_phy+0x18/0x150 [bluetooth] __mutex_lock+0x6f/0x868 ? hci_conn_get_phy+0x18/0x150 [bluetooth] ? hci_conn_get_phy+0x18/0x150 [bluetooth] ? l2cap_sock_getsockopt+0x8e/0x6a0 [bluetooth] ? mark_held_locks+0x4a/0x70 hci_conn_get_phy+0x18/0x150 [bluetooth] l2cap_sock_getsockopt+0x4fd/0x6a0 [bluetooth] __sys_getsockopt+0x88/0x1c0 __x64_sys_getsockopt+0x1c/0x20 do_syscall_64+0x33/0x48 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f4944d20d4a Code: 48 8b 0d 21 a1 0b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ee a0 0b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffec0c06688 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000031 RCX: 00007f4944d20d4a RDX: 000000000000000e RSI: 0000000000000112 RDI: 0000000000000031 RBP: 0000000000000000 R08: 00007ffec0c06694 R09: 00007ffec0df8090 R10: 00007ffec0c066d4 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000019 R14: 0000000000000000 R15: 0000561dc8d35f0c input: Teufel MOTIV GO (AVRCP) as /devices/virtual/input/input21 Bluetooth: hci0: SCO packet for unknown connection handle 3 Bluetooth: hci0: SCO packet for unknown connection handle 3 Bluetooth: hci0: SCO packet for unknown connection handle 3 Bluetooth: hci0: SCO packet for unknown connection handle 3 Bluetooth: hci0: urb 00000000dd0f7389 submission failed (90) Bluetooth: hci0: sending frame failed (-90) Bluetooth: hci0: urb 00000000dd0f7389 submission failed (90) Bluetooth: hci0: sending frame failed (-90) [...] # lsusb -s 002:002 -vv Bus 002 Device 002: ID 0b05:190e ASUSTek Computer, Inc. ASUS USB-BT500 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 224 Wireless bDeviceSubClass 1 Radio Frequency bDeviceProtocol 1 Bluetooth bMaxPacketSize0 64 idVendor 0x0b05 ASUSTek Computer, Inc. idProduct 0x190e bcdDevice 2.00 iManufacturer 1 Realtek iProduct 2 ASUS USB-BT500 iSerial 3 00E04C239987 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x00b1 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xe0 Self Powered Remote Wakeup MaxPower 500mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 3 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 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 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 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 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 2 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 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 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 2 bNumEndpoints 2 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 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 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 3 bNumEndpoints 2 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 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 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 4 bNumEndpoints 2 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 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 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 5 bNumEndpoints 2 bInterfaceClass 224 Wireless bInterfaceSubClass 1 Radio Frequency bInterfaceProtocol 1 Bluetooth iInterface 4 Bluetooth Radio 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 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 can't get debug descriptor: Resource temporarily unavailable Device Status: 0x0001 Self Powered
Created attachment 296673 [details] kernel .config (5.12.1, AMD FX-8370)
Have not seen this since quite some time. Kernel 5.15.5 and 5.16-rc3 are ok too. Closing as obsolete.