This seems to be the source of the problem:
https://github.com/machinekit/machinekit-hal/blob/9fca994e08e3f8384498e78ea8e8baa1c899e4db/src/rtapi/rtapi_app.cc#L1457

The system call iopl seems to be returning an error:
http://man7.org/linux/man-pages/man2/iopl.2.html

On Fri, May 1, 2020 at 2:49 PM John Allwine <j...@pocketnc.com> wrote:

> I posted this on the Beaglebone forums
> <https://groups.google.com/forum/#!category-topic/beagleboard/FOEDBLvmu2c>
> and figured someone here may be able to help too:
>
> I'm trying to use a real time kernel on the Beaglebone AI to get
> MachineKit running. I'm able to run MachineKit on a non-rt kernel
> (4.14.108-ti-r113), but when I update to the latest ti-rt kernel
> (4.14.108-ti-rt-r134), I get an error:
>
> user cannot gain I/O privileges - forgot 'sudo make setuid'?
>
> In dmesg, I see this:
> [  811.654246] warning: process `rtapi:0' used the deprecated sysctl
> system call with 8.1.2.
>
> Robert Nelson offered to tweak the rt kernel config to support that call.
> Is that what needs to happen?
>
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