[Bug 269906] dtrace requires empty expression to print anything from matching search

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269906

            Bug ID: 269906
           Summary: dtrace requires empty expression to print anything
                    from matching search
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@igalic.co

example:

root@freebsd:~ # dtrace -n 'kinst::virtqueue_poll: /cpu == 1/'
dtrace: invalid probe specifier kinst::virtqueue_poll: /cpu == 1/: syntax error
near end of input


the same command with an empty expression:

root@freebsd:~ # dtrace -n 'kinst::virtqueue_poll: /cpu == 1/{}' | head
dtrace: description 'kinst::virtqueue_poll: ' matched 83 probes
CPU     ID                    FUNCTION:NAME
  1  73362               virtqueue_poll:137 
  1  73363               virtqueue_poll:141 
  1  73364               virtqueue_poll:144 
  1  73365               virtqueue_poll:151 
  1  73366               virtqueue_poll:155 
  1  73367               virtqueue_poll:158 
  1  73355               virtqueue_poll:112 
  1  73356               virtqueue_poll:115 
  1  73357               virtqueue_poll:118 
dtrace: failed to write to <stdout>: Broken pipe
root@freebsd:~ #

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