On Wed, 07 Jul 2021, Daire Byrne wrote: > I stripped out all my patches so it's just this one on top of 5.13-rc7 > and I can still reproduce it. > > I can only trigger it by mounting the same export (RHEL7 server) using > two different namespaces and performing a heavy IO benchmark to either > mount (leaving one idle). Part of the benchmark walks thousands of > dirs with files (hence the readdirs). > > If I mount the same server twice with no (same) namespaces, even with > the patch applied, it works fine without any crash. That's pretty solid evidence! I just realized that the stack trace you reported mentions "kfree_const()". My latest patch doesn't include that, and nfs doesn't use it at all. Might you still be using the older patch? NeilBrown
