[Bug 210286] Traceroute6 does not timeout in the continued presence of echo replies

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210286

            Bug ID: 210286
           Summary: Traceroute6 does not timeout in the continued presence
                    of echo replies
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dennypage at me.com

Created attachment 171445
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171445&action=edit
Diff to fix traceroute6

If traceroute6 is run and one of the hops is not responding, receipt of an IPv6
ICMP echo reply will cause traceroute6 to re-execute the wait on the current
probe. If echo replies are coming in at a rate faster than the timeout,
traceroute6 will essentially wait forever on the non responding hop.

This can be easily reproduced using ping6 and traceroute6 simultaneously in the
presence of non responsive hops.

A diff which corrects the problem is attached.

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