[Bug 220327] ktrace(1) doesn't follow descendants after forks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220327

            Bug ID: 220327
           Summary: ktrace(1) doesn't follow descendants after forks
           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 183876
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=183876&action=edit
Testcase: pdfork.c

The attached program pdfork.c forks and launches /bin/ls. When run under
ktrace(1), child process is launched, but doesn't appear in the trace file
despite of the -d flag.

> ktrace -d pdfork

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