I think the NULL pointer dereference is red herring here, the disconnection is 
where problem occurs:
júl 22 21:12:50 lenovo kernel: usb 3-2: USB disconnect, device number 2

So we need to know why the webcam disconnected right before it starts streaming.
Please add "xhci-pci.dyndbg=+p xhci-hcd.dyndbg=+p usbcore.dyndbg=+p" to the 
kernel parameter, reproduce the bug, then attach dmesg.

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https://bugs.launchpad.net/bugs/1705900

Title:
  Lenovo e73 USB webcam problems

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