[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 #8 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Adrian Chadd from comment #7)
> Well, this is running a _really_ recent version of -HEAD. Is there some left
> over library crap floating around that may be being loaded that screws with
> this?

There shouldn't be. We look at the debug.dtrace.providers sysctl to see which
providers are available. In your case it looks like libdtrace isn't seeing a
few of them (ip, io, tcp, udp). The error message is bogus I think; there are
some bugs in libdtrace's D parser's error handling.

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