[Bug 218452] I can cause an assertion with a dtrace script and when it does happen, dtrace fails until the module dtraceall is reloaded

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218452

            Bug ID: 218452
           Summary: I can cause an assertion with a dtrace script and when
                    it does happen, dtrace fails until the module
                    dtraceall is reloaded
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kungfujesus06 at gmail.com

Created attachment 181559
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181559&action=edit
Dtrace script that eventually fails with an assertion

I've attached a dtrace script where this problem happens reliably for me within
a stable VM.  The assertion is about a timestamp.

Here's the assertion:

Assertion failed: (buf->dtbd_timestamp >= first_timestamp), file
/usr/src/cddl/lib/libdtrace/../../../cddl/contrib/opensolaris/lib/libdtrace/common/dt_consume.c,
line 3328.

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