[Bug 191506] [dtrace] [dtruss] dtruss doesn't seem to work on -HEAD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191506

--- Comment #6 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Adrian Chadd from comment #5)
> Hm, I tried on a freshly installed -HEAD and it works. This has been
> upgraded (with make delete-old and make delete-old-libs) from -HEAD monthly
> for about twelve months.
> 
> I wonder if anything old is hanging around .

The debug output indicates that you don't have sdt.ko loaded (it can be loaded
by kldloading dtraceall.ko). Rui changed libdtrace to automatically kldload
dtraceall in r254197, a little under a year ago.

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