Failed verifying security descriptor on MAX_LIN. The group cannot be of type UID

I started seeing a couple weeks ago:

2017-08-29T00:54:39-07:00 cluster-1 /boot/kernel.amd64/kernel: [bam_acl.c:323](pid 2869="lwio")(tid=100917) ifs_verify_sd: Failed verifying security descriptor on lin:1:2595:5a5e. The group cannot be of type UID.

2017-08-29T00:55:05-07:00 cluster-15 /boot/kernel.amd64/kernel: [bam_acl.c:323](pid 2869="lwio")(tid=100868) ifs_verify_sd: Failed verifying security descriptor on MAX_LIN. The group cannot be of type UID.

My (18) node cluster now logs ~3-4 million of these messages per day -- started abruptly on 2017-08-11 (yeah, we're trying to figure out what we changed on that day).

OneFS 8.0.0.4 / NL410s & S210s / both SMB and NFS clients -- diverse work-flows (which is my way of saying "we have no idea what our users are doing")

Attempting to parse the error message:

- Generated by block_allocation_manager_access_control_list.c

- The calling process is 'lwio', which I'm guessing is a foundational chunk of the LikeWise protocol engine

- LikeWise cares about validating access to LINs, and apparently ran into something it didn't like about the security descriptor associated with lin {xyz}.  Although sometimes ... looks like a bug to me ... lwio is unable to identify the offending LIN identifier and emits the string "MAX_LIN" in its place.

- The phrase "The group cannot be of type UID" is opaque to me.  (My way of saying "I have no clue here".)

Anyone have insights to offer?

--sk