That doesn't ring a bell.  Does it happen with every configuration
(e.g., configs/sim/axis/axis.ini) or just with certain ones?

Is there any more information, such as python source code line numbers,
shown?  Run from the terminal and/or check the linuxcnc_*.txt files in
your home directory.

If the locations and byte values vary from run to run, it feels to me
like it may be an uninitialized memory sort of bug, except that it's
harder to create those in Python than in C(++).  Of course, if you've
determined that it depends on named parameters then it is probably
happening in the gcode interpreter itself.

If you can figure out what process it's coming from, arrange to run it
under valgrind.  This is an excellent tool for diagnosing access to
uninitialized memory.

Jeff

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