"sockstat: struct xinpgen size mismatch" in 11.2-p4 jail on 12-STABLE host

[Paul Mather]

I updated a system yesterday to the latest 12-STABLE as part of the upcoming 12-RELEASE cycle.  I've installed several BETA and at least one RC of 12 since updating from 11-STABLE as part of the 12 cycle and have had no problems up to now.  Currently, I am at FreeBSD 12.0-PRERELEASE r340834 GENERIC amd64.

Since the most recent update, I have been getting this error when I invoke "sockstat" in any of the jails running on the system:

	sockstat: struct xinpgen size mismatch

The jails are managed via iocage and all are running 11.2-RELEASE-p4, which is the most up-to-date version of 11.2-RELEASE.

Has anyone encountered this error?  Unfortunately, it means that it breaks Salt, which is what I use to help manage the jails.  Sockstat works fine on the host, just not in the jails.

I am using a GENERIC kernel which includes "options COMPAT_FREEBSD11".  I assumed this would allow FreeBSD 11 binaries to work on a FreeBSD 12 kernel, which it has done up to now.

Cheers,

Paul.