how to get rid of the probed dumping non-probe mode error?

abs32 wrote:

There is a motive. My 2.8.4 has a jitter in the range of 2000. It also uses the compiled module "curve geometry" (compensation of the position of the X coordinate depending on the position of the Y coordinate). There is no such module for 2.9.

I don't think that "curve geometery" was ever a built-in LinuxCNC component. Did you install it from a comp file? 
If you have the .comp file then it will also work with 2.9.x once installed, but if you don't have the source file then you may be a bit stuck. 

If you have 2000ns jitter then you may be using the RTAI kernel? It is possible to run LinuxCNC 2.9.x with RTAI, but it's been a while since I created an installer package. (they have to be built by hand, as the buildbot currently has no RTAI builders, and it needs modifications to the Makefile) 
Having said that, I have a PC that gives 3-digit latency with both RTAI and Preempt-RT. it appears to be entirely random.