1. WTF after closing? closeSerial (/home/eddy/C-files/LibSidServo/serial.c, line 484): close fd closeSerial (/home/eddy/C-files/LibSidServo/serial.c, line 489): Kill encoder thread closeSerial (/home/eddy/C-files/LibSidServo/serial.c, line 491): close fd *** bit out of range 0 - FD_SETSIZE on fd_set ***: terminated Aborted 2. Init: set "motors" positions due to "encoders" position 3. From time to time: repeat 2