I am able to perform dns lookups on a P+T box with -74 (and the OR has
separatly confirmed -74 as affected), so this appears to not be
systemic:
mru@grovel-x-p64p5:~$ cat /proc/version_signature
Ubuntu 3.13.0-74.118~precise1-generic 3.13.11-ckt30
mru@grovel-x-p64p5:~$ dig aaaa www.google.com @2001:4860:4860::8888
; <<>> DiG 9.8.1-P1 <<>> aaaa www.google.com @2001:4860:4860::8888
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33031
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.google.com. IN AAAA
;; ANSWER SECTION:
www.google.com. 299 IN AAAA 2a00:1450:4009:811::2004
;; Query time: 39 msec
;; SERVER: 2001:4860:4860::8888#53(2001:4860:4860::8888)
;; WHEN: Wed Dec 23 19:17:07 2015
;; MSG SIZE rcvd: 60
mru@grovel-x-p64p5:~$ sudo tcpdump -n host 2001:4860:4860::8888
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
19:19:51.930966 IP6 2001:470:6973:2:18f8:278f:cd6d:654e.52306 >
2001:4860:4860::8888.53: 55720+ AAAA? www.google.com. (32)
19:19:51.971448 IP6 2001:4860:4860::8888.53 >
2001:470:6973:2:18f8:278f:cd6d:654e.52306: 55720 1/0/0 AAAA
2a00:1450:4009:811::2004 (60)
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1527902
Title:
3.13.0-71: IPv6 UDP DNS packets are not received
Status in linux package in Ubuntu:
In Progress
Status in linux-lts-trusty package in Ubuntu:
In Progress
Bug description:
After upgrading linux kernel from version 3.13.0-68 to 3.13.0-71 then
Kopete (IM messenger) stopped working, cannot connect to any jabber
server.
I started debugging this problem and found out that, problem resolve
when I boot back 3.13.0-68 kernel version (without touching any system
files or packages). When I boot 3.13.0-71 Kopete always does not
connect.
Next I debugged that problem on 3.13.0-71 is just when
/etc/resolv.conf contains only IPv6 addresses of DNS servers.
Problem is comes down to dns resolver (jabber in Kopete has its own
for SRV records) and syscall recvfrom() (on IPv6 socket) always return
error -EAGAIN without any data returned. But wireshark see that DNS
response was recevied.
So it looks like that after 3.13.0-68 kernel was included some change
which broke receiving UDP packets via IPv6 socket. IPv4 is OK.
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