> On Aug 8, 2021, at 6:37 PM, Mike Javorski <mike.javorski@xxxxxxxxx> wrote: > > 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. Hi Mike- Thanks for the report. Since you are using a distribution kernel and don't have much kernel debugging experience, we typically ask you to work with your distributor first. linux-nfs@ is a developer's mailing list, we're not really prepared to provide user support. When you report the problem to Arch, you might want to have a description of your workload (especially if you can reproduce the problem often with a particular application or user activity), and maybe be prepared to capture a network trace of the failure using tcpdump. -- Chuck Lever
