[libusb] Segfault in libusb_exit on macOS 12

[Dylan S. <sta...@gm...>]

Hello!

I'm currently writing an application that interfaces with a USB Mass
Storage device, and am running into an issue where a segfault occurs during
the call to libusb_exit (as far as LLDB is concerned that is). I'm using
the rusb Rust library, but I'm mostly looking for some assistance
understanding the following log lines:

[ 0.165580] [0000a9c9] libusb: debug [libusb_release_interface] interface 0
[ 0.167419] [0000a9c9] libusb: debug [darwin_attach_kernel_driver]
reenumerating device for kernel driver attach
[ 0.237059] [0000a9c9] libusb: debug [darwin_reenumerate_device]
darwin/reenumerate_device: waiting for re-enumeration to complete...
[ 0.238605] [0000a9d6] libusb: debug [darwin_devices_detached] detected
device detached due to re-enumeration. sessionID: 0x445298d5179,
locationID: 0x2814400000
[ 0.301901] [0000a9d6] libusb: debug [darwin_get_cached_device] finding
cached device for sessionID 0x44819634aee
[ 0.301995] [0000a9d6] libusb: debug [darwin_get_cached_device] matching
sessionID/locationID 0x44819634aee/0x14400000 against cached device with
sessionID/locationID 0x445298d5179/0x14400000
[ 0.302007] [0000a9d6] libusb: debug [darwin_get_cached_device] found
cached device with matching location that is being re-enumerated
[ 0.302012] [0000a9d6] libusb: debug [darwin_get_cached_device] caching new
device with sessionID 0x44819634aee
[ 5.304201] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
cached device descriptor:
[ 5.304219] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bDescriptorType:    0x01
[ 5.304312] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bcdUSB:             0x0200
[ 5.304322] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bDeviceClass:       0x00
[ 5.304325] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bDeviceSubClass:    0x00
[ 5.304327] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bDeviceProtocol:    0x00
[ 5.304331] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bMaxPacketSize0:    0x40
[ 5.304334] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
idVendor:           0x05ac
[ 5.304336] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
idProduct:          0x120a
[ 5.304339] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bcdDevice:          0x0002
[ 5.304341] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
iManufacturer:      0x01
[ 5.304387] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
iProduct:           0x02
[ 5.304393] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
iSerialNumber:      0x03
[ 5.304396] [0000a9d6] libusb: debug [darwin_cache_device_descriptor]
bNumConfigurations: 0x02
[10.237129] [0000a9c9] libusb: error [darwin_reenumerate_device]
darwin/reenumerate_device: timeout waiting for reenumerate
[10.237150] [0000a9c9] libusb: info [darwin_capture_release_interface] on
attempt to reattach the kernel driver got ret=-7
[10.237162] [0000a9c9] libusb: debug [libusb_close]
[10.237179] [0000a9c9] libusb: warning [darwin_close] USBDeviceClose:
device not opened for exclusive access
[10.237196] [0000a9c9] libusb: debug [libusb_exit]
[15.306749] [0000a9d6] libusb: debug [darwin_check_configuration] active
config: 1, first config: 1
[15.306781] [0000a9d6] libusb: debug [process_new_device] re-using existing
device from context 0x7f99b8f04470 for with session 0x445298d5179 new
session 0x44819634aee
[15.306796] [0000a9d6] libusb: debug [process_new_device] found device with
address 1 port = 4 parent = 0x0 at 0x600000f380ba
[15.306926] [0000a9d6] libusb: debug [darwin_event_thread_main] darwin
event thread exiting
[15.307442] [0000a9c9] libusb: debug [libusb_unref_device] destroy device
20.1
zsh: segmentation fault  sudo cargo run --color=always --package
rs-ipod-sysinfo --bin rs-ipod-sysinfo

My program is run as sudo, and calls libusb_set_auto_detach_kernel_driver.
The application performs a series of calls to libusb_bullk_transfer (SCSI
INQUIRY requests).

Any pointers on what I might be doing incorrectly to hit this issue would
be appreciated!

- Dylan