[Bug libc/16154] New: resolv code not able to update resolv.conf for ipv6

["sthomas at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16154

            Bug ID: 16154
           Summary: resolv code not able to update resolv.conf for ipv6
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: sthomas at linux dot vnet.ibm.com
                CC: drepper.fsp at gmail dot com

If we call dhclient as follows in its not able to update resolv.conf even
though the tcpdump shows that the system receives ipv6 DNS namserver
information to be updated

dhclient -6 -nw -S eth0

-bash-4.2# tcpdump -i eth0
tcpdump: WARNING: eth0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes

00:09:24.900136 IP6 localhost.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6
inf-req
00:09:25.951474 IP6 localhost.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6
inf-req
00:09:27.973827 IP6 localhost.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6
inf-req
00:09:31.868104 IP6 localhost.dhcpv6-client > ff02::1:2.dhcpv6-server: dhcp6
inf-req
00:09:35.872764 IP6 fe80::200:ff:fe00:a0a0.dhcpv6-server >
localhost.dhcpv6-client: dhcp6 reply


I compiled the same dhclient with glibc version glibc-2.17 and it works just
fine. Therefore I am assuming here its problem in glibc code itself 

I tested this on Fedora 19 glibc-2.17 and dhclient-4.2.5(from ISC website)

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