So for the past 4 days I have been trying to figure out why rtorrent (running on my vm) would not start downloading to my unraid share (ubuntu isos btw) and I found the solution.
It turns out all you have to do is modify your fstab line to include cache=mmap and reboot.
Here is an example fstab with the correct fix:
sharename /mnt/placetomntinguestvm 9p msize=262144,trans=virtio,version=9p2000.L,cache=mmap,rw 0 0