I ran into the same crash problem when I use 'reread' command to update my plot. As pointed out in the above post, using single thread could work around the bug. However, rebuilding gnuplot may not be an option for most user.
My workaround approach is to run gnuplot in a single CPU core by means of the command 'taskset' (on linux). For exmple: taskset -c 0 gnuplot ... This command runs gnuplot on CPU 0, so that it is effectively a single-thread process and the problem is avoided.
