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Odd, you have a usb-serial gadget device in this system that is
disconnecting somehow?  That oops doesn't point to anything in the
usb gadget codebase, "all" we have done is move the call to
shutdown the endpoints to earlier in the disconnect function.

Yes the board starts usb-serial and usb-ethernet gadget and on
reboot when tearing it down I am seeing the above. As soon as it
disables the tegra-xudc endpoints (as seen above) the board appears to

stall.

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I'm glad to revert this, but it feels really odd that this is
causing you an rcu stall issue.

Thanks. I can't say I understand it either, but I am certain it is
caused by this change.

I do not have much to add in terms of solutions but want to chime in 
that the same issue happened to me the other day when I upgraded my 
kernel. It manifests itself with the rcu stall whenever I try to reboot 
my device with the USB-cable connected (it is a usb-serial gadget 
device). Moving the usb_ep_disable() calls to outside the lock (where 
they were before the patch) solves it.