recursive lookups problems with 9.8.0_p2

[Matus UHLAR - fantomas]

Hello,

after upgrading to 9.8.0p2 I have notices problems with recursive queries.
The server sometimes does not return answer for e.g. www.yahoo.com. 

Repeated lookups for www.yahoo.com sometimes do, sometimes do not return the
answer, only the first CNAME, but the nameserver did know where the CNAMEs
point to and answered when I asked.
A few times I was unable to get the full answer for quite long time.
(and users were complaining).

I don't have this problem with 9.7.3...

I found the 9.8.0 CNAMEs chain problem reported in April without further
informations.

I think this situation can cause real troubles, because stub resolvers are
not expected to lookup the CNAMEs themselves, are they?


Example, a few lookups in the short time:

uhlar at fantomas% dig www.yahoo.com @195.168.1.156

[snip]

;; ANSWER SECTION:
www.yahoo.com.          65      IN      CNAME   fp.wg1.b.yahoo.com.
fp.wg1.b.yahoo.com.     3035    IN      CNAME   eu-fp.wa1.b.yahoo.com.
eu-fp.wa1.b.yahoo.com.  60      IN      A       87.248.122.122
eu-fp.wa1.b.yahoo.com.  60      IN      A       87.248.112.181

;; AUTHORITY SECTION:
wa1.b.yahoo.com.        600605  IN      NS      yf2.yahoo.com.
wa1.b.yahoo.com.        600605  IN      NS      yf1.yahoo.com.

;; ADDITIONAL SECTION:
yf1.yahoo.com.          1235    IN      A       68.142.254.15
yf2.yahoo.com.          1235    IN      A       68.180.130.15

;; Query time: 31 msec
;; SERVER: 195.168.1.156#53(195.168.1.156)
;; WHEN: Mon May 30 17:46:30 2011
;; MSG SIZE  rcvd: 178

uhlar at fantomas% dig www.yahoo.com @195.168.1.156

[snip]

;; ANSWER SECTION:
www.yahoo.com.          64      IN      CNAME   fp.wg1.b.yahoo.com.

;; Query time: 1 msec
;; SERVER: 195.168.1.156#53(195.168.1.156)
;; WHEN: Mon May 30 17:46:31 2011
;; MSG SIZE  rcvd: 54

uhlar at fantomas% dig www.yahoo.com @195.168.1.156

[snip]

;; ANSWER SECTION:
www.yahoo.com.          29      IN      CNAME   fp.wg1.b.yahoo.com.
fp.wg1.b.yahoo.com.     2999    IN      CNAME   eu-fp.wa1.b.yahoo.com.
eu-fp.wa1.b.yahoo.com.  24      IN      A       87.248.112.181
eu-fp.wa1.b.yahoo.com.  24      IN      A       87.248.122.122

;; AUTHORITY SECTION:
wa1.b.yahoo.com.        600569  IN      NS      yf2.yahoo.com.
wa1.b.yahoo.com.        600569  IN      NS      yf1.yahoo.com.

;; ADDITIONAL SECTION:
yf1.yahoo.com.          1199    IN      A       68.142.254.15
yf2.yahoo.com.          1199    IN      A       68.180.130.15


-- 
Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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