[Pdns-users] Missing Answers RR in some response

[Vu Le]

I am install pdns_recursor on Centos 6.5 32-bit from EPEL repo. The
configuration is mostly default. I run the test from a Spirent
testcenter and set max query rate to 5000 qps. The testcenter report
about 10-20% unsuccessful query therefore I capture the packet and see
that the response packet is missing Answer RR section. Run the same
test again BIND on the same server does not have that phenomenon.

# pdns_recursor --version
Jul 25 06:29:41 PowerDNS Recursor 3.6.0
(jenkins at autotest.powerdns.com) (C) 2001-2014 PowerDNS.COM BV
Jul 25 06:29:41 Using 32-bits mode. Built on 20140620134716 by
mockbuild@, gcc 4.4.7 20120313 (Red Hat 4.4.7-4).
Jul 25 06:29:41 PowerDNS comes with ABSOLUTELY NO WARRANTY. This is
free software, and you are welcome to redistribute it according to the
terms of the GPL version 2.
Jul 25 06:29:41 Features: lua

# cat /etc/pdns-recursor/recursor.conf
setuid=pdns-recursor
setgid=pdns-recursor
allow-from=x.x.x.x
log-common-errors=no
max-mthreads=4096

#tail /var/log/messages
Jul 24 17:59:50 SERVER pdns_recursor[13859]: Error processing or aging
answer packet: out of bounds: 16 >= 16
Jul 24 17:59:50 SERVER pdns_recursor[13859]: Error processing or aging
answer packet: out of bounds: 16 >= 16
Jul 24 17:59:54 SERVER pdns_recursor[13859]: Error processing or aging
answer packet: out of bounds: 16 >= 16
Jul 24 17:59:54 SERVER pdns_recursor[13859]: Error processing or aging
answer packet: out of bounds: 16 >= 16