freebsd stable - Nov 2018 - "sockstat: struct xinpgen size mismatch" in 11.2-p4 jail on 12-STABLE host

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.

On Sat, Nov 24, 2018 at 09:17:23AM -0500, Paul Mather
wrote:
> 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.
We broke this system management ABI months ago.  I'm not sure why you're
only bumping into this now.

We don't provide backward compatibility for these interfaces.  To make
this configuration work, I'd suggest replacing the sockstat in
the jail with a statically linked version built for FreeBSD 12.

-- Brooks
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