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Resource busy during set_configuration or write

See original GitHub issue

With the following script, I got Resource busy error.

import usb.core
import usb.util


print('r311 usb testing start')
dev = usb.core.find(idVendor=0x2109, idProduct=0x7638)
pkt_pwd_check = b'\xef\x01\xff\xff\xff\xff\x01\x00\x07\x13\x00\x00\x00\x00\x00\x1b'


dev.set_configuration()
cfg = dev.get_active_configuration()
print(f'config: {cfg}')

# get an endpoint instance
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]


ep = usb.util.find_descriptor(
    intf,
    # match the first OUT endpoint
    custom_match = \
    lambda e: \
        usb.util.endpoint_direction(e.bEndpointAddress) == \
        usb.util.ENDPOINT_OUT)

assert ep is not None

# write the data
ep.write(pkt_pwd_check)

LIBUSB_DEBUG=4 PYUSB_DEBUG=debug python r311-reader-usb.py
r311 usb testing start
2021-02-10 11:55:13,196 DEBUG:usb.backend.libusb1:_LibUSB.__init__(<CDLL 'libusb-1.0.so.0', handle 557ad14f2e10 at 0x7f139d8e36d0>)
[timestamp] [threadID] facility level [function call] <message>
--------------------------------------------------------------------------------
[ 0.000013] [00003411] libusb: debug [libusb_init] created default context
[ 0.000028] [00003411] libusb: debug [libusb_init] libusb v1.0.24.11584
[ 0.000036] [00003411] libusb: debug [get_kernel_version] reported kernel version is 5.4.91-1-lts
[ 0.000059] [00003411] libusb: debug [op_init] found usbfs at /dev/bus/usb
[ 0.000064] [00003411] libusb: debug [op_init] max iso packet length is (likely) 98304 bytes
[ 0.000080] [00003411] libusb: debug [op_init] sysfs is available
[ 0.000643] [00003413] libusb: debug [linux_udev_event_thread_main] udev event thread entering
[ 0.004368] [00003411] libusb: debug [linux_get_device_address] getting address for device: usb1 detached: 0
[ 0.004382] [00003411] libusb: debug [linux_get_device_address] scan usb1
[ 0.004412] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=1
[ 0.004417] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 1 session_id 257
[ 0.004422] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/1 (session 257)
[ 0.004529] [00003411] libusb: debug [linux_get_device_address] getting address for device: 1-1 detached: 0
[ 0.004536] [00003411] libusb: debug [linux_get_device_address] scan 1-1
[ 0.004563] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=16
[ 0.004568] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 16 session_id 272
[ 0.004573] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/16 (session 272)
[ 0.004601] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad1512460 (1-1) has parent 0x557ad1511cd0 (usb1) port 1
[ 0.004685] [00003411] libusb: debug [linux_get_device_address] getting address for device: 1-2 detached: 0
[ 0.004691] [00003411] libusb: debug [linux_get_device_address] scan 1-2
[ 0.004717] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=2
[ 0.004722] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 2 session_id 258
[ 0.004727] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/2 (session 258)
[ 0.004754] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad15125d0 (1-2) has parent 0x557ad1511cd0 (usb1) port 2
[ 0.004842] [00003411] libusb: debug [linux_get_device_address] getting address for device: 1-2.3 detached: 0
[ 0.004848] [00003411] libusb: debug [linux_get_device_address] scan 1-2.3
[ 0.004876] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=4
[ 0.004881] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 4 session_id 260
[ 0.004886] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/4 (session 260)
[ 0.004913] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad14f7610 (1-2.3) has parent 0x557ad15125d0 (1-2) port 3
[ 0.004997] [00003411] libusb: debug [linux_get_device_address] getting address for device: 1-2.4 detached: 0
[ 0.005003] [00003411] libusb: debug [linux_get_device_address] scan 1-2.4
[ 0.005031] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=9
[ 0.005036] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 9 session_id 265
[ 0.005039] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/9 (session 265)
[ 0.005067] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad14f7720 (1-2.4) has parent 0x557ad15125d0 (1-2) port 4
[ 0.005149] [00003411] libusb: debug [linux_get_device_address] getting address for device: 1-3 detached: 0
[ 0.005156] [00003411] libusb: debug [linux_get_device_address] scan 1-3
[ 0.005183] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=3
[ 0.005188] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 3 session_id 259
[ 0.005193] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/3 (session 259)
[ 0.005220] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad15126c0 (1-3) has parent 0x557ad1511cd0 (usb1) port 3
[ 0.005302] [00003411] libusb: debug [linux_get_device_address] getting address for device: 1-5 detached: 0
[ 0.005308] [00003411] libusb: debug [linux_get_device_address] scan 1-5
[ 0.005335] [00003411] libusb: debug [linux_get_device_address] bus=1 dev=5
[ 0.005340] [00003411] libusb: debug [linux_enumerate_device] busnum 1 devaddr 5 session_id 261
[ 0.005344] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 1/5 (session 261)
[ 0.005374] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad14f7940 (1-5) has parent 0x557ad1511cd0 (usb1) port 5
[ 0.005462] [00003411] libusb: debug [linux_get_device_address] getting address for device: usb2 detached: 0
[ 0.005470] [00003411] libusb: debug [linux_get_device_address] scan usb2
[ 0.005495] [00003411] libusb: debug [linux_get_device_address] bus=2 dev=1
[ 0.005500] [00003411] libusb: debug [linux_enumerate_device] busnum 2 devaddr 1 session_id 513
[ 0.005505] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 2/1 (session 513)
[ 0.005616] [00003411] libusb: debug [linux_get_device_address] getting address for device: 2-2 detached: 0
[ 0.005622] [00003411] libusb: debug [linux_get_device_address] scan 2-2
[ 0.005648] [00003411] libusb: debug [linux_get_device_address] bus=2 dev=2
[ 0.005653] [00003411] libusb: debug [linux_enumerate_device] busnum 2 devaddr 2 session_id 514
[ 0.005658] [00003411] libusb: debug [linux_enumerate_device] allocating new device for 2/2 (session 514)
[ 0.005684] [00003411] libusb: debug [linux_get_parent_info] dev 0x557ad14f7eb0 (2-2) has parent 0x557ad14f7fb0 (usb2) port 2
[ 0.005790] [00003411] libusb: debug [usbi_add_event_source] add fd 5 events 1
[ 0.005799] [00003411] libusb: debug [usbi_io_init] using timer for timeouts
[ 0.005803] [00003411] libusb: debug [usbi_add_event_source] add fd 6 events 1
2021-02-10 11:55:13,202 INFO:usb.core:find(): using backend "usb.backend.libusb1"
2021-02-10 11:55:13,203 DEBUG:usb.backend.libusb1:_LibUSB.enumerate_devices()
[ 0.006279] [00003411] libusb: debug [libusb_get_device_list]  
[ 0.006292] [00003411] libusb: debug [discovered_devs_append] need to increase capacity
2021-02-10 11:55:13,203 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2c70>)
[ 0.006463] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,203 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2e50>)
[ 0.006701] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,203 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2d00>)
[ 0.006897] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,203 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2eb0>)
[ 0.007059] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,204 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2d90>)
[ 0.007646] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,205 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2f10>)
[ 0.008708] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,205 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2cd0>)
[ 0.009045] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,206 DEBUG:usb.backend.libusb1:_LibUSB.get_device_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2e80>)
[ 0.009269] [00003411] libusb: debug [libusb_get_device_descriptor]  
2021-02-10 11:55:13,206 DEBUG:usb.backend.libusb1:_LibUSB.get_configuration_descriptor(<usb.backend.libusb1._Device object at 0x7f139d6b2e80>, 0)
[ 0.010412] [00003411] libusb: debug [libusb_get_config_descriptor] index 0
2021-02-10 11:55:13,207 DEBUG:usb.backend.libusb1:_LibUSB.open_device(<usb.backend.libusb1._Device object at 0x7f139d6b2e80>)
[ 0.011416] [00003411] libusb: debug [libusb_open] open 1.16
[ 0.011523] [00003411] libusb: debug [usbi_add_event_source] add fd 7 events 4
2021-02-10 11:55:13,208 DEBUG:usb.backend.libusb1:_LibUSB.set_configuration(<usb.backend.libusb1._DeviceHandle object at 0x7f139da4e5e0>, 1)
[ 0.012038] [00003411] libusb: debug [libusb_set_configuration] configuration 1
Traceback (most recent call last):
  File "/opt/garfield/projects/fingerprint/fingerprint-r311/r311-reader-usb.py", line 10, in <module>
    dev.set_configuration()
  File "/home/garfield/.local/lib/python3.9/site-packages/usb/core.py", line 905, in set_configuration
    self._ctx.managed_set_configuration(self, configuration)
  File "/home/garfield/.local/lib/python3.9/site-packages/usb/core.py", line 113, in wrapper
    return f(self, *args, **kwargs)
  File "/home/garfield/.local/lib/python3.9/site-packages/usb/core.py", line 159, in managed_set_configuration
    self.backend.set_configuration(self.handle, cfg.bConfigurationValue)
  File "/home/garfield/.local/lib/python3.9/site-packages/usb/_debug.py", line 62, in do_trace
    return f(*args, **named_args)
  File "/home/garfield/.local/lib/python3.9/site-packages/usb/backend/libusb1.py", line 812, in set_configuration
    _check(self.lib.libusb_set_configuration(dev_handle.handle, config_value))
  File "/home/garfield/.local/lib/python3.9/site-packages/usb/backend/libusb1.py", line 604, in _check
    raise USBError(_strerror(ret), ret, _libusb_errno[ret])
usb.core.USBError: [Errno 16] Resource busy
2021-02-10 11:55:13,211 DEBUG:usb.backend.libusb1:_LibUSB.close_device(<usb.backend.libusb1._DeviceHandle object at 0x7f139da4e5e0>)
[ 0.014534] [00003411] libusb: debug [libusb_close]  
[ 0.014545] [00003411] libusb: debug [usbi_remove_event_source] remove fd 7
2021-02-10 11:55:13,211 DEBUG:usb.backend.libusb1:_LibUSB._finalize_object()
[ 0.014676] [00003411] libusb: debug [libusb_exit]  
[ 0.014682] [00003411] libusb: debug [libusb_exit] destroying default context
[ 0.014688] [00003411] libusb: debug [libusb_handle_events_timeout_completed] doing our own event handling
[ 0.014693] [00003411] libusb: debug [handle_events] event sources modified, reallocating event data
[ 0.014701] [00003411] libusb: debug [usbi_wait_for_events] poll() 2 fds with timeout in 0ms
[ 0.014708] [00003411] libusb: debug [usbi_wait_for_events] poll() returned 0
[ 0.014714] [00003411] libusb: debug [libusb_unref_device] destroy device 2.2
[ 0.014719] [00003411] libusb: debug [libusb_unref_device] destroy device 2.1
[ 0.014724] [00003411] libusb: debug [libusb_unref_device] destroy device 1.5
[ 0.014729] [00003411] libusb: debug [libusb_unref_device] destroy device 1.3
[ 0.014734] [00003411] libusb: debug [libusb_unref_device] destroy device 1.9
[ 0.014738] [00003411] libusb: debug [libusb_unref_device] destroy device 1.4
[ 0.014743] [00003411] libusb: debug [libusb_unref_device] destroy device 1.2
[ 0.014748] [00003411] libusb: debug [libusb_unref_device] destroy device 1.16
[ 0.014753] [00003411] libusb: debug [libusb_unref_device] destroy device 1.1
[ 0.014758] [00003411] libusb: debug [usbi_remove_event_source] remove fd 6
[ 0.014768] [00003411] libusb: debug [usbi_remove_event_source] remove fd 5
[ 0.014790] [00003413] libusb: debug [linux_udev_event_thread_main] udev event thread exiting