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Verify that we report ENOENT when userspace tries to create a thread-group leader pidfd for a thread pidfd that isn't a thread-group leader. Link: https://lore.kernel.org/r/20250403-work-pidfd-fixes-v1-4-a123b6ed6716@kernel.org Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org>