I am currently having nightmares when using USB devices (storage/3G modem/wireless). System indicates an oops occured, and not even [Alt]+[SysRq] magic keys work. I normally end up having to pull the plug on the Pi2B. I dunno if this is hardware or software related.
Checking logs is fruitless (I normally end up losing previous boot logs & also corrupted filesystems). I get similar output as listed here.
Going back to an image with linux-raspberrypi-4.1.16-2 made sometime end Jan-2016 delivers the same result.
It seems to be a Pi issue? Is anyone else experiencing this? Is there a workaround?