~  export LIBUSB_DEBUG=4
 ~  /usr/libexec/fprintd
[timestamp] [threadID] facility level [function call] <message>
--------------------------------------------------------------------------------
[ 0.000007] [000175cc] libusb: debug [libusb_init] libusb v1.0.25.11692
[ 0.000013] [000175cc] libusb: debug [usbi_add_event_source] add fd 7 events 1
[ 0.000016] [000175cc] libusb: debug [usbi_io_init] using timer for timeouts
[ 0.000018] [000175cc] libusb: debug [usbi_add_event_source] add fd 8 events 1
[ 0.000022] [000175cc] libusb: debug [get_kernel_version] reported kernel version is 5.16.9-200.fc35.x86_64
[ 0.000033] [000175cc] libusb: debug [op_init] found usbfs at /dev/bus/usb
[ 0.000035] [000175cc] libusb: debug [op_init] max iso packet length is (likely) 98304 bytes
[ 0.000038] [000175cc] libusb: debug [op_init] sysfs is available
[ 0.000498] [000175cf] libusb: debug [linux_udev_event_thread_main] udev event thread entering
[ 0.001759] [000175cc] libusb: debug [linux_get_device_address] getting address for device: usb1 detached: 0
[ 0.001763] [000175cc] libusb: debug [linux_get_device_address] scan usb1
[ 0.001773] [000175cc] libusb: debug [linux_get_device_address] bus=1 dev=1
[ 0.001778] [000175cc] libusb: debug [linux_enumerate_device] busnum 1 devaddr 1 session_id 257
[ 0.001779] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 1/1 (session 257)
[ 0.001811] [000175cc] libusb: debug [linux_get_device_address] getting address for device: usb2 detached: 0
[ 0.001812] [000175cc] libusb: debug [linux_get_device_address] scan usb2
[ 0.001823] [000175cc] libusb: debug [linux_get_device_address] bus=2 dev=1
[ 0.001824] [000175cc] libusb: debug [linux_enumerate_device] busnum 2 devaddr 1 session_id 513
[ 0.001826] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 2/1 (session 513)
[ 0.001855] [000175cc] libusb: debug [linux_get_device_address] getting address for device: usb3 detached: 0
[ 0.001857] [000175cc] libusb: debug [linux_get_device_address] scan usb3
[ 0.001866] [000175cc] libusb: debug [linux_get_device_address] bus=3 dev=1
[ 0.001867] [000175cc] libusb: debug [linux_enumerate_device] busnum 3 devaddr 1 session_id 769
[ 0.001868] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 3/1 (session 769)
[ 0.001912] [000175cc] libusb: debug [linux_get_device_address] getting address for device: 3-10 detached: 0
[ 0.001913] [000175cc] libusb: debug [linux_get_device_address] scan 3-10
[ 0.001921] [000175cc] libusb: debug [linux_get_device_address] bus=3 dev=6
[ 0.001925] [000175cc] libusb: debug [linux_enumerate_device] busnum 3 devaddr 6 session_id 774
[ 0.001926] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 3/6 (session 774)
[ 0.001951] [000175cc] libusb: debug [linux_get_parent_info] dev 0x56215df38ba0 (3-10) has parent 0x56215df38590 (usb3) port 10
[ 0.001974] [000175cc] libusb: debug [linux_get_device_address] getting address for device: 3-2 detached: 0
[ 0.001975] [000175cc] libusb: debug [linux_get_device_address] scan 3-2
[ 0.001983] [000175cc] libusb: debug [linux_get_device_address] bus=3 dev=3
[ 0.001984] [000175cc] libusb: debug [linux_enumerate_device] busnum 3 devaddr 3 session_id 771
[ 0.001985] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 3/3 (session 771)
[ 0.001997] [000175cc] libusb: debug [linux_get_parent_info] dev 0x56215df384e0 (3-2) has parent 0x56215df38590 (usb3) port 2
[ 0.002033] [000175cc] libusb: debug [linux_get_device_address] getting address for device: 3-3 detached: 0
[ 0.002034] [000175cc] libusb: debug [linux_get_device_address] scan 3-3
[ 0.002043] [000175cc] libusb: debug [linux_get_device_address] bus=3 dev=4
[ 0.002045] [000175cc] libusb: debug [linux_enumerate_device] busnum 3 devaddr 4 session_id 772
[ 0.002047] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 3/4 (session 772)
[ 0.002056] [000175cc] libusb: debug [linux_get_parent_info] dev 0x56215df38690 (3-3) has parent 0x56215df38590 (usb3) port 3
[ 0.002080] [000175cc] libusb: debug [linux_get_device_address] getting address for device: 3-4 detached: 0
[ 0.002081] [000175cc] libusb: debug [linux_get_device_address] scan 3-4
[ 0.002091] [000175cc] libusb: debug [linux_get_device_address] bus=3 dev=5
[ 0.002092] [000175cc] libusb: debug [linux_enumerate_device] busnum 3 devaddr 5 session_id 773
[ 0.002094] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 3/5 (session 773)
[ 0.002104] [000175cc] libusb: debug [linux_get_parent_info] dev 0x56215df39420 (3-4) has parent 0x56215df38590 (usb3) port 4
[ 0.002126] [000175cc] libusb: debug [linux_get_device_address] getting address for device: usb4 detached: 0
[ 0.002128] [000175cc] libusb: debug [linux_get_device_address] scan usb4
[ 0.002136] [000175cc] libusb: debug [linux_get_device_address] bus=4 dev=1
[ 0.002138] [000175cc] libusb: debug [linux_enumerate_device] busnum 4 devaddr 1 session_id 1025
[ 0.002139] [000175cc] libusb: debug [linux_enumerate_device] allocating new device for 4/1 (session 1025)
[ 0.002194] [000175cc] libusb: debug [libusb_hotplug_register_callback] new hotplug cb 0x56215df2fda0 with handle 1
[ 0.002207] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.002211] [000175d0] libusb: debug [handle_events] event sources modified, reallocating event data
[ 0.002213] [000175d0] libusb: debug [usbi_wait_for_events] poll() 2 fds with timeout in 2000ms
[ 0.002216] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.002218] [000175d0] libusb: debug [handle_event_trigger] event triggered
[ 0.002220] [000175d0] libusb: debug [handle_event_trigger] hotplug message received
[ 0.002234] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.002236] [000175d0] libusb: debug [usbi_wait_for_events] poll() 2 fds with timeout in 2000ms
[ 0.002272] [000175cc] libusb: debug [libusb_get_device_list]
[ 0.002286] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002288] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002292] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002293] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002296] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002298] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002300] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002303] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002305] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002306] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002307] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002308] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002310] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002311] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002313] [000175cc] libusb: debug [libusb_get_device_descriptor]
[ 0.002314] [000175cc] libusb: debug [libusb_get_device_descriptor]

(fprintd:95692): libfprint-device-WARNING **: 22:01:44.519: Failed to open /sys/bus/usb/devices/3-3/power/persist
[ 0.002714] [000175cc] libusb: debug [libusb_open] open 3.4
[ 0.100283] [000175cc] libusb: debug [usbi_add_event_source] add fd 11 events 4
[ 0.100340] [000175cc] libusb: debug [libusb_claim_interface] interface 0
[ 0.100406] [000175cc] libusb: debug [libusb_submit_transfer] transfer 0x56215df44d88
[ 0.100414] [000175cc] libusb: debug [add_to_flying_list] arm timer for timeout in 1000ms (first in line)
[ 0.100425] [000175cc] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 1
[ 0.100451] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.100480] [000175d0] libusb: debug [handle_event_trigger] event triggered
[ 0.100483] [000175d0] libusb: debug [handle_event_trigger] someone updated the event sources
[ 0.100492] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.100498] [000175d0] libusb: debug [handle_events] event sources modified, reallocating event data
[ 0.100506] [000175d0] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 2000ms
[ 0.100639] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.100664] [000175d0] libusb: debug [reap_for_handle] urb type=3 status=0 transferred=1
[ 0.100671] [000175d0] libusb: debug [handle_bulk_completion] handling completion status 0 of bulk urb 1/1
[ 0.100677] [000175d0] libusb: debug [handle_bulk_completion] all URBs in transfer reaped --> complete!
[ 0.100683] [000175d0] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.100691] [000175d0] libusb: debug [usbi_handle_transfer_completion] transfer 0x56215df44d88 has callback 0x7f4a830cedd0
[ 0.100743] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.100749] [000175d0] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 2000ms
[ 0.100763] [000175cc] libusb: debug [libusb_free_transfer] transfer 0x56215df44d88
[ 0.100781] [000175cc] libusb: debug [libusb_submit_transfer] transfer 0x56215df41e58
[ 0.100787] [000175cc] libusb: debug [add_to_flying_list] arm timer for timeout in 1000ms (first in line)
[ 0.100795] [000175cc] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 40
[ 0.101070] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.101099] [000175d0] libusb: debug [reap_for_handle] urb type=3 status=0 transferred=38
[ 0.101106] [000175d0] libusb: debug [handle_bulk_completion] handling completion status 0 of bulk urb 1/1
[ 0.101112] [000175d0] libusb: debug [handle_bulk_completion] all URBs in transfer reaped --> complete!
[ 0.101117] [000175d0] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.101125] [000175d0] libusb: debug [usbi_handle_transfer_completion] transfer 0x56215df41e58 has callback 0x7f4a830cedd0
[ 0.101153] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.101158] [000175d0] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 2000ms
[ 0.101165] [000175cc] libusb: debug [libusb_free_transfer] transfer 0x56215df41e58
[ 0.101194] [000175cc] libusb: debug [libusb_submit_transfer] transfer 0x56215df3d2a8
[ 0.101200] [000175cc] libusb: debug [add_to_flying_list] arm timer for timeout in 1000ms (first in line)
[ 0.101205] [000175cc] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 5
[ 0.101366] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.101375] [000175d0] libusb: debug [reap_for_handle] urb type=3 status=0 transferred=5
[ 0.101380] [000175d0] libusb: debug [handle_bulk_completion] handling completion status 0 of bulk urb 1/1
[ 0.101384] [000175d0] libusb: debug [handle_bulk_completion] all URBs in transfer reaped --> complete!
[ 0.101387] [000175d0] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.101393] [000175d0] libusb: debug [usbi_handle_transfer_completion] transfer 0x56215df3d2a8 has callback 0x7f4a830cedd0
[ 0.101407] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.101412] [000175d0] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 2000ms
[ 0.101427] [000175cc] libusb: debug [libusb_submit_transfer] transfer 0x56215df3d4a8
[ 0.101435] [000175cc] libusb: debug [add_to_flying_list] arm timer for timeout in 5000ms (first in line)
[ 0.101444] [000175cc] libusb: debug [submit_bulk_transfer] need 1 urbs for new transfer with length 266
[ 0.101482] [000175cc] libusb: debug [libusb_free_transfer] transfer 0x56215df3d2a8
[ 0.101616] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.101624] [000175d0] libusb: debug [reap_for_handle] urb type=3 status=0 transferred=8
[ 0.101628] [000175d0] libusb: debug [handle_bulk_completion] handling completion status 0 of bulk urb 1/1
[ 0.101633] [000175d0] libusb: debug [handle_bulk_completion] all URBs in transfer reaped --> complete!
[ 0.101638] [000175d0] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.101644] [000175d0] libusb: debug [usbi_handle_transfer_completion] transfer 0x56215df3d4a8 has callback 0x7f4a830cedd0
[ 0.101658] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.101663] [000175d0] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 2000ms
[ 0.101676] [000175cc] libusb: debug [libusb_submit_transfer] transfer 0x56215df3d588
[ 0.101683] [000175cc] libusb: debug [add_to_flying_list] arm timer for timeout in 1000ms (first in line)
[ 0.101728] [000175cc] libusb: debug [libusb_handle_events_timeout_completed] another thread is doing event handling
[ 0.101938] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.101965] [000175d0] libusb: debug [reap_for_handle] urb type=2 status=0 transferred=4
[ 0.101970] [000175d0] libusb: debug [handle_control_completion] handling completion status 0
[ 0.101974] [000175d0] libusb: debug [arm_timer_for_next_timeout] no timeouts, disarming timer
[ 0.101979] [000175d0] libusb: debug [usbi_handle_transfer_completion] transfer 0x56215df3d588 has callback 0x7f4a82c384b0
[ 0.101985] [000175d0] libusb: debug [sync_transfer_cb] actual_length=4
[ 0.101999] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.102003] [000175d0] libusb: debug [usbi_wait_for_events] poll() 3 fds with timeout in 2000ms
[ 0.102010] [000175cc] libusb: debug [libusb_free_transfer] transfer 0x56215df3d588
[ 0.102029] [000175cc] libusb: debug [libusb_close]
[ 0.102048] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.102055] [000175d0] libusb: debug [handle_event_trigger] event triggered
[ 0.102058] [000175d0] libusb: debug [handle_event_trigger] someone is closing a device
[ 0.102065] [000175d0] libusb: debug [libusb_try_lock_events] someone else is closing a device
[ 0.102069] [000175d0] libusb: debug [libusb_event_handler_active] someone else is closing a device
[ 0.102072] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] another thread is doing event handling
[ 0.102081] [000175cc] libusb: debug [usbi_remove_event_source] remove fd 11
[ 0.102132] [000175d0] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.102138] [000175d0] libusb: debug [handle_events] event sources modified, reallocating event data
[ 0.102144] [000175d0] libusb: debug [usbi_wait_for_events] poll() 2 fds with timeout in 2000ms
[ 0.102168] [000175cc] libusb: debug [libusb_free_transfer] transfer 0x56215df3d4a8
libfprint-context-Message: 22:01:44.619: Ignoring device due to initialization error: USB error on device 06cb:00fc : No such device (it may have been disconnected) [-4]

(fprintd:95692): fprintd-WARNING **: 22:01:44.619: Failed to get name: net.reactivated.Fprint
[ 0.102981] [000175cc] libusb: debug [libusb_hotplug_deregister_callback] deregister hotplug cb 1
[ 0.103090] [000175d0] libusb: debug [usbi_wait_for_events] poll() returned 1
[ 0.103110] [000175d0] libusb: debug [handle_event_trigger] event triggered
[ 0.103114] [000175d0] libusb: debug [handle_event_trigger] someone unregistered a hotplug cb
[ 0.103122] [000175d0] libusb: debug [usbi_hotplug_process] freeing hotplug cb 0x56215df2fda0 with handle 1
[ 0.103281] [000175cc] libusb: debug [libusb_exit]
[ 0.103313] [000175cf] libusb: debug [linux_udev_event_thread_main] udev event thread exiting
[ 0.103381] [000175cc] libusb: debug [libusb_unref_device] destroy device 4.1
[ 0.103393] [000175cc] libusb: debug [libusb_unref_device] destroy device 3.5
[ 0.103397] [000175cc] libusb: debug [libusb_unref_device] destroy device 3.4
[ 0.103401] [000175cc] libusb: debug [libusb_unref_device] destroy device 3.3
[ 0.103404] [000175cc] libusb: debug [libusb_unref_device] destroy device 3.6
[ 0.103408] [000175cc] libusb: debug [libusb_unref_device] destroy device 2.1
[ 0.103412] [000175cc] libusb: debug [libusb_unref_device] destroy device 1.1
[ 0.103420] [000175cc] libusb: debug [usbi_remove_event_source] remove fd 8
[ 0.103430] [000175cc] libusb: debug [usbi_remove_event_source] remove fd 7
[ 0.103440] [000175cc] libusb: warning [libusb_exit] device 3.1 still referenced