Hi all, I believe that this behavior is caused by the ``intr'' (-i) option to mount_nfs(8). As noted by Stephan Uphoff in PR/79700, he does not recommend use intr option. After remove the option, the dd works well. Sorry for the noisy :-) However, I think some warnings can be added to mount_nfs(8) about the usage of intr and its consequence. So this won't be happened again. Regards, Rong-En Fan