I appreciate that Chuck. It was not my intention to seek basic "user" support, but as I don't know the intricacies of how nfs works in the kernel, I don't know where to get the right information to share to help with the diagnostic effort. I have read through the troubleshooting recommendations on the linux-nfs wiki, but the issue is beyond what is indicated there, and my setup has been running without any NFS issues for years at this point, and I can demonstrate the error merely by changing the booted kernel, so I feel confident it's not a simple configuration error. I have raised an issue on the ArchLinux bug tracker as well (https://bugs.archlinux.org/task/71775). Given that the ArchLinux version of the kernel has minimal delta from mainline, (I've checked and no fs/rpc/nfs files are changed in 7 file delta vs mainline), it's been my previous experience that they will refer me to the kernel subsystem mailing list, but I will wait to hear back from them, and see what they say. - mike - mike On Sun, Aug 8, 2021 at 3:47 PM Chuck Lever III <chuck.lever@xxxxxxxxxx> wrote: > > > > > 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 > > >
