Jogging wobble/hunting

When I jog with my CNC setup (via a WHB04B-6), sometimes instead of going to the commanded position it sort of "wiggles" around the target position back and forth in a sort of sine wave until it eventually settles on the correct location. It's not a mechanics issues, LinuxCNC is commanding my (no feedback) steppers to move like this.

 

Additionally, if the sine wave tries to violate soft bounds everything faults and errors out.

What do I need to do to make it track my jogging exactly and not do weird things like this? I understand if it overshoots a bit if I suddenly switch directions, but it shouldn't have trouble tracking normal forward movement.

It looks to be an issue in the step generator.
I wonder if you have run into clipping of the feedback loop
because the step lengths and step space are so close
to bounding the maximum velocity.

I would first try setting the step lengths to say 30000,30000
so you have lots of margin.

Also there is no DPLL enabled, so you need a couple  statements like:

setp hm2_7i96s.0.dpll.01.timer-us -100
setp hm2_7i96s.0.stepgen.timer-number 1

in the hal file

EDIT:

Actually, looking at the plot more carefully, it looks like
there is an acceleration constraint violation that starts
the oscillation. That seems more like a  LinuxCNC bug.