[Bug 220324] Process run under truss(1) doesn't launch child processes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220324

            Bug ID: 220324
           Summary: Process run under truss(1) doesn't launch child
                    processes
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: yuri at rawbw.com

Created attachment 183874
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183874&action=edit
Testcase: pdfork.c

The attached program executes /bin/ls when run normally, but it doesn't execute
/bin/ls when run under truss(1) like this:

> truss -f 2>out ./pdfork

There is no ls output, and the DTrace script exec.d doesn't show the exec call.

r317247 (FreeBSD 11.0-STABLE)

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