I have been experiencing nfs file access hangs with multiple release versions of the 5.13.x linux kernel. In each case, all file transfers freeze for 5-10 seconds and then resume. This seems worse when reading through many files sequentially. My server: - Archlinux w/ a distribution provided kernel package - filesystems exported with "rw,sync,no_subtree_check,insecure" options Client: - Archlinux w/ latest distribution provided kernel (5.13.9-arch1-1 at writing) - nfs mounted via /net autofs with "soft,nodev,nosuid" options (ver=4.2 is indicated in mount) I have tried the 5.13.x kernel several times since the first arch release (most recently with 5.13.9-arch1-1), all with similar results. Each time, I am forced to downgrade the linux package to a 5.12.x kernel (5.12.15-arch1 as of writing) to clear up the transfer issues and stabilize performance. No other changes are made between tests. I have confirmed the freezing behavior using both ext4 and btrfs filesystems exported from this server. At this point I would appreciate some guidance in what to provide in order to diagnose and resolve this issue. I don't have a lot of kernel debugging experience, so instruction would be helpful. - mike
