Trenton - Dtrace / PC-BSD

Hi Allan and Kris,

I've been listening to the show for the past two years and really enjoy
it. I used to be working with FreeBSD back around the turn of the
century and it's fun to see how much has changed (and remained the
same) since I left. Your show has helped rekindle the fun I had cutting
my teeth on this during my computer science education and in my first
job. Well done to everyone involved in the show.

But, I have a comment and question.

First, in the last episode you had a question using ports and packages
and you lamented the lack of a good tool for building configured ports
and using the packages. As far I as I know synth (portsmgmt/synth) does
this, but you need to have your ports tree branch and package repo
lined up. It requires more knowledge about the port and package system
than maybe a normal user would want, but it seems possible. Of course,
I can only attest to this in practice because I only understood this
after trying to build 64-bit linux_base and realizing everything was
out of synch, but not really wanting to destroy a god working system. I
imagine someday I'll create a boot environment and blow away all my
packages to see how well this really works.

Next, I'm having problems with using DTrace an PC-BSD 10.3. PC-BSD is
installed on a Lenovo T420 and is using Geli encryption. The dtrace
command runs OK, but any script I run (even hello world) returns this
error message:

: "/usr/lib/dtrace/io.d", line 43: operator -> cannot be applied to a
forward declaration: no struct devstat definition is available

I've pulled my hair out trying to find an answer and the closest I can
find is a bug report to FreeBSD that claimed it was an issue with Grub
not filling in some paths correctly:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=185290

Though the report claims it was fixed, it doesn't seem to work for me.

You probably just want me to upgrade to TrueOS, but I don't have a
clear upgrade path because of the Geli.

I'm not afraid to dig and get my hands dirty, but I honestly don't know
where to start. My original goal for running DTrace was to run the
scripts from the tuning chapter of the Advanced ZFS mastery book, just
so I could experiment with tuning. Anyway, I figured you two might have
some pointers.

Thanks again for the great work and best regards,

--
Trenton