Hi, The primary problem is Bolt (Thunderbolt 3) tests that are experiencing a regression when run in a container using overlayfs, failing at: Bail out! ERROR:../tests/test-common.c:1413:test_io_dir_is_empty: 'empty' should be FALSE https://gitlab.freedesktop.org/bolt/bolt/-/issues/171#note_872119 I can reproduce this with 5.12.0-0.rc6.184.fc35.x86_64+debug and at approximately the same time I see one, sometimes more, kernel messages: [ 6295.379283] overlayfs: upper fs does not support xattr, falling back to index=off and metacopy=off. But I don't know if that kernel message relates to the bolt test failure. If I run the test outside of a container, it doesn't fail. If I run the test in a podman container using the btrfs driver instead of the overlay driver, it doesn't fail. So it seems like this is an overlayfs bug, but could be some kind of overlayfs+btrfs interaction. Could this be related and just not yet merged? https://lore.kernel.org/linux-unionfs/20210309162654.243184-1-amir73il@xxxxxxxxx/ Thanks, -- Chris Murphy
