On Tue, Feb 23, 2021 at 02:36:04PM -0600, Dean E. Weimer via freebsd-stable 
wrote:
> I just built and installed FreeBSD 13.0 Beta 3 from source checked out 
> with last commit of 4b737a9c58cac69008f189cc44e7d1a81a0b601c after the 
> install I was installing a few ports, and perl5.32 failed to build 
> stating dtrace -h not available.
> 
> root@fbsd13-devel:/ # dtrace -h
> dtrace: failed to establish error handler: "/usr/lib/dtrace/psinfo.d", 
> line 1: failed to copy type of 'pr_uid': Type information is in parent 
> and unavailable
> 
> The initial install from the FreeBSD-BETA3 iso image does work as 
> expected, so the problem was introduced since then.
> 
> root@fbsd13:/jails/devel # dtrace -h
> dtrace: -h requires one or more scripts or enabling options
> 
> It does appear that the commit        
> ae093a0614f30d4cdffb853e4eba93322e8ed8f4 
> references changes to dtrace.

Are you using GENERIC, or some custom kernel configuration?  Could you
show output from "ctfdump -S /boot/kernel/kernel"?  The error you
reported is typically the result of some problems with the C type
metadata used by dtrace.  The commit you referenced ought to be
unrelated.
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