I checked out the focal kernel and reverted the following commits. And the problem went away, reverting just the 1st one wasn't enough to fix the issue.
- NFSv4: nfs_atomic_open() can race when looking up a non-regular file - NFSv4: Handle case where the lookup of a directory fails git clone git://kernel.ubuntu.com/ubuntu/ubuntu-focal.git linux-ubuntu-focal cd linux-ubuntu-focal git checkout Ubuntu-hwe-5.13-5.13.0-40.45_20.04.1 -b Ubuntu-hwe-5.13-5.13.0-40.45_20.04.1 vim debian/changelog # modify version in head of file LANG=C fakeroot debian/rules clean LANG=C fakeroot debian/rules binary-headers binary-generic binary-perarch skipmodule=true ** Also affects: linux-signed-hwe-5.13 (Ubuntu) Importance: Undecided Status: New ** Summary changed: - nfs cannot access/list wildcard file unless its cached + Regression: nfs cannot access/list wildcard file unless its cached -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1971482 Title: Regression: nfs cannot access/list wildcard file unless its cached To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.13/+bug/1971482/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs