Comment # 6 on bug 926862 from Marcus Meissner

I debugged this a while ago and it is very tricky ;)

Basically:
 libgphoto2 loads and unloads its usb drivers. 
one of them is the usb0 driver.

The usb0 driver on load starts a pthread to communicate with udev.

on tear down, it tries to kill this thread again, but as this happens in
"dlclose()" the thread cannot terminate due to a deadlock.


After debugging the best way is probably to no longer build the old libusb 0
driver anymore, as the libusb 1 driver works nicely.