[Bug 234352] Dtrace cannot print string argument to system call.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234352

            Bug ID: 234352
           Summary: Dtrace cannot print string argument to system call.
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: shamaz.mazum at gmail.com

I try to execute Dtrace like so (an example from wiki.freebsd.org):

dtrace -n 'syscall::open*:entry { printf("%s %s", execname, copyinstr(arg0));
}'

and get some strange errors:

dtrace: error on enabled probe ID 2 (ID 76423: syscall:freebsd:open:entry):
invalid address (0x8002543a3) in action #2 at DIF offset 12

like when stringof() were used instead of copyinstr().

FreeBSD version 12.0-RELEASE.

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