[Bug 266098] dtrace: error on enabled probe ID 2 (ID 79710: io:kernel:none:start): invalid address (0x20) in action #4 at DIF offset 16

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266098

            Bug ID: 266098
           Summary: dtrace: error on enabled probe ID 2 (ID 79710:
                    io:kernel:none:start): invalid address (0x20) in
                    action #4 at DIF offset 16
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: b...@freebsd.org
          Reporter: 0...@freebsd.org

I'm executing the following DTrace program on FreeBSD 13.1-RELEASE amd64 (the
classic bitesize.d ported to FreeBSD):

    dtrace:::BEGIN {
            printf("Tracing... Hit Ctrl-C to end.\n");
    }

    io:::start {
            @size[pid, execname] = quantize(args[0]->bio_bcount);
    }

    dtrace:::END {
            printf("\n%8s  %s\n", "PID", "CMD");
            printa("%8d  %s\n%@d\n", @size);
    }

and I'm getting a lot of the following log messages shorty after the script is
started:

    dtrace: error on enabled probe ID 2 (ID 79710: io:kernel:none:start):
invalid address (0x20) in action #4 at DIF offset 16

I tested that on multiple amd64 machines on 13.1-RELEASE. The result is the
same. What could be causing that?

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