Yes, I realize now that it was stupid to do, but I set md_sync_thresh and md_sync_window to 0 while trying to experiment with why a file move was slow.  But now, I can't change those values or stop the parity check because all the various waits etc. in the code are looking for pending counts to be < 0.  Just wondering if anybody has ideas for getting out of it other than just doing an unclean shutdown

Ok, thanks to some fun kernel hackery, I got myself out of the situation so no longer urgently need an answer.  Still curious if there was a different way to go about it though.