BIND 10 #2030: NSAS wrongly recording nameservers are unreachable

[BIND 10 Development]

#2030: NSAS wrongly recording nameservers are unreachable
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            Reporter:  jreed     |                        Owner:
                Type:  defect    |                       Status:  new
            Priority:  medium    |                    Milestone:  New Tasks
           Component:  resolver  |                     Keywords:
           Sensitive:  0         |              Defect Severity:  N/A
         Sub-Project:  DNS       |  Feature Depending on Ticket:
Estimated Difficulty:  0         |          Add Hours to Ticket:  0
         Total Hours:  0         |                    Internal?:  0
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 I think a problem with looking up "yahoo.org. IN MX"

 {{{
 2012-06-07 17:46:39.058 DEBUG [b10-resolver.reslib] RESLIB_NXDOM_NXRR
 NXDOMAIN/NXRRSET received in response to query for <ns3.yahoo.com. IN
 AAAA>
 2012-06-07 17:46:39.058 DEBUG [b10-resolver.nsas] NSAS_EMPTY_RESPONSE
 response to query for ns3.yahoo.com. returned an empty answer section
 }}}

 caused all the other nameservers associated with it to be marked as
 "unreachable".

 The full log is 793 lines so I put it here:
 http://git.bind10.isc.org/~jreed/J.yahoo.txt

 This is related to #2029.

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Ticket URL: <http://bind10.isc.org/ticket/2030>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development