selftests/filesystems: check that reading the root of an empty mount namespace stalls nobody

2026-10-04T10:36:15Z

A readdir of the root of an empty mount namespace stuck in the page fault of its buffer must stall neither a create nor a lookup in that directory. The test needs userfaultfd and skips without it. Link: https://patch.msgid.link/20261002-work-mount-fixes-4-v1-21-dd44b89d44ce@kernel.org Signed-off-by: Christian Brauner (Amutable)

laptop-kernel/tools/testing/selftests/filesystems/empty_mntns/root_readdir_test.c, branch master

selftests/filesystems: check that reading the root of an empty mount namespace stalls nobody