On Tue, Jun 01, 2021 at 04:55:35PM +0000, Frank van der Linden wrote: > On Mon, May 31, 2021 at 12:59:51PM +0800, Wang Yugui wrote: > > > > > > Hi, > > > > nfsd dead loop when xfstests generic/531 > > > > linux kernel of nfs server: 5.10.41 > > linux kernel of nfs client: 5.10.41 > > > > > > nfsd dead loop when xfstests generic/531 > > > > linux kernel of nfs server: 5.10.41 > > linux kernel of nfs client: 5.10.41 > > This is a known issue. generic/531 opens a large number of files, causing > the nfsd file cache code to walk a very long LRU list of open files. For > v4, there will be a lot of long term opens (because of the OPEN call), > and they all end up on that list. > > So, the basic issue is, that the nfsd file cache is a good match for > v3 semantics, but less so for v4 semantics. > > I posted an experimental patch to work around the issue: > > https://lore.kernel.org/linux-nfs/20201020183718.14618-4-trondmy@xxxxxxxxxx/T/#m869aa427f125afee2af9a89d569c6b98e12e516f > > The rhashtable patch has issues, so disregard that one, but the other one > is a basic fix for this issue. It has one other issue that I noticed (refcount > error), but that is easily fixed. > > I should update the patch and formally post it.. That would be great. --b.
