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 tostall.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.
