[Bug 460581] [NEW] [Karmic] host lookup error
Public bug reported: Binary package hint: bind9 when lookup up a host with the 'host command' there is a long wait after the initial response. This seems to be related to second round of lookup, which fails: m...@purple:$ host -v www.google.com Trying www.google.com ;; -HEADER- opcode: QUERY, status: NOERROR, id: 13531 ;; flags: qr rd ra; QUERY: 1, ANSWER: 7, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;www.google.com.IN A ;; ANSWER SECTION: www.google.com. 10914 IN CNAME www.l.google.com. www.l.google.com. 190 IN A 74.125.77.103 www.l.google.com. 190 IN A 74.125.77.105 www.l.google.com. 190 IN A 74.125.77.99 www.l.google.com. 190 IN A 74.125.77.106 www.l.google.com. 190 IN A 74.125.77.104 www.l.google.com. 190 IN A 74.125.77.147 Received 148 bytes from 192.168.1.1#53 in 51 ms Trying www.l.google.com ;; connection timed out; no servers could be reached Trying www.l.google.com ;; connection timed out; no servers could be reached This problem was introduced by upgrading to Karmic. It also affects wget and the web browser (only on initial host lookups). ProblemType: Bug Architecture: i386 CheckboxSubmission: 0623bc3e86ec6ff42e9a53f9c34bce9a CheckboxSystem: c8e8edcc4d15e0d55af04774be77e330 Date: Sun Oct 25 19:25:54 2009 DistroRelease: Ubuntu 9.10 Package: bind9-host 1:9.6.1.dfsg.P1-3 ProcEnviron: PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.31-14.48-generic SourcePackage: bind9 Uname: Linux 2.6.31-14-generic i686 ** Affects: bind9 (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug i386 -- [Karmic] host lookup error https://bugs.launchpad.net/bugs/460581 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 460581] Re: [Karmic] host lookup error
** Attachment added: Dependencies.txt http://launchpadlibrarian.net/34365889/Dependencies.txt ** Attachment added: XsessionErrors.txt http://launchpadlibrarian.net/34365892/XsessionErrors.txt -- [Karmic] host lookup error https://bugs.launchpad.net/bugs/460581 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 460581] Re: [Karmic] host lookup error
Hi Chuck,
My revolv.conf looks like this:
m...@purple:~$ cat /etc/resolv.conf
# Generated by NetworkManager
domain home
search home
nameserver 192.168.1.1
It point to the DNS service of my DSL modem.
I ran strace, and this is where it get's stuck:
futex(0xb7855048, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0xb7855044, {FUTEX_OP_SET, 0,
FUTEX_OP_CMP_GT, 1}) = 1
rt_sigaction(SIGHUP, {0x3ad500, ~[RTMIN RT_1], 0}, NULL, 8) = 0
rt_sigsuspend([]www.google.com has address 74.125.77.103
The full strace output is attached to this ticket as well.
--
[Karmic] host lookup error
https://bugs.launchpad.net/bugs/460581
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[Bug 460581] Re: [Karmic] host lookup error
** Attachment added: host_strace.log http://launchpadlibrarian.net/34421863/host_strace.log -- [Karmic] host lookup error https://bugs.launchpad.net/bugs/460581 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 460581] Re: [Karmic] host lookup error
And the output of lddd `which host`. Maybe you can compare the library versions to ones on your computer? m...@purple:~$ ldd `which host` linux-gate.so.1 = (0x00e47000) liblwres.so.50 = /usr/lib/liblwres.so.50 (0x00fa2000) libdns.so.50 = /usr/lib/libdns.so.50 (0x0062) libgssapi_krb5.so.2 = /usr/lib/libgssapi_krb5.so.2 (0x00d4f000) libcrypto.so.0.9.8 = /lib/i686/cmov/libcrypto.so.0.9.8 (0x008d6000) libbind9.so.50 = /usr/lib/libbind9.so.50 (0x00c67000) libisc.so.50 = /usr/lib/libisc.so.50 (0x00d8d000) libisccfg.so.50 = /usr/lib/libisccfg.so.50 (0x003f3000) libcap.so.2 = /lib/libcap.so.2 (0x0011) libpthread.so.0 = /lib/tls/i686/cmov/libpthread.so.0 (0x00418000) libxml2.so.2 = /usr/lib/libxml2.so.2 (0x00477000) libc.so.6 = /lib/tls/i686/cmov/libc.so.6 (0x00116000) libGeoIP.so.1 = /usr/lib/libGeoIP.so.1 (0x00ed8000) libkrb5.so.3 = /usr/lib/libkrb5.so.3 (0x0031b000) libk5crypto.so.3 = /usr/lib/libk5crypto.so.3 (0x0025a000) libcom_err.so.2 = /lib/libcom_err.so.2 (0x00285000) libkrb5support.so.0 = /usr/lib/libkrb5support.so.0 (0x00e9a000) libdl.so.2 = /lib/tls/i686/cmov/libdl.so.2 (0x00b1c000) libkeyutils.so.1 = /lib/libkeyutils.so.1 (0x00e2d000) libresolv.so.2 = /lib/tls/i686/cmov/libresolv.so.2 (0x00289000) libz.so.1 = /lib/libz.so.1 (0x0029d000) libisccc.so.50 = /usr/lib/libisccc.so.50 (0x00d28000) /lib/ld-linux.so.2 (0x00ccd000) libm.so.6 = /lib/tls/i686/cmov/libm.so.6 (0x002b3000) -- [Karmic] host lookup error https://bugs.launchpad.net/bugs/460581 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 460581] Re: [Karmic] host lookup error
Do you maybe have any further suggestions for how to debug this? Something must be interfering with those lookups. The effect is new in Karmic, so would be nice to figure out what it is. What is the difference between the first lookup that 'host' does and the second? It seems that something is blocking the corresponding network traffic. II have no firewall, so that can't be it. I looked at various log-files in /var/log, but the only suspicious thing I see are a lot of messages from wpa_supplicant. Is there something I can do to verify whether this is related? My network is wireless with simple WEP-authentication, so maybe wpa_supplicant is not needed? If so, why has it been started? Best regards, Marco. On Tue, Oct 27, 2009 at 3:52 PM, Chuck Short chuck.sh...@canonical.comwrote: I am still not able to reproduce this. I think its something with your setup. Regards chuck ** Changed in: bind9 (Ubuntu) Status: Incomplete = Invalid -- [Karmic] host lookup error https://bugs.launchpad.net/bugs/460581 You received this bug notification because you are a direct subscriber of the bug. -- [Karmic] host lookup error https://bugs.launchpad.net/bugs/460581 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] [NEW] [Karmic] host -4 does IPv6 lookup -- times out
Public bug reported: Binary package hint: bind9 When using 'host' to do a dns lookup on Karmic, I get a fast initial response for the IPv4 lookup: m...@purple:~$ host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 74.125.77.99 www.l.google.com has address 74.125.77.147 www.l.google.com has address 74.125.77.104 but then a long wait and a timeout on IPv6: ;; connection timed out; no servers could be reached ;; connection timed out; no servers could be reached I guess this is because my home network router/DNS cache does not support IPv6. This timeout for host lookups with 'host' is not such a problem, but also seems to affect firefox (fixable with a setting) and ssh logins to remote machines. Why does the host command look for a IPv6 address after It gets a good IPv4 response? I tried forcing only IPv4 lookup with 'host -4', but the result is the same: m...@purple:~$ host -4 www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 74.125.77.147 www.l.google.com has address 74.125.77.104 www.l.google.com has address 74.125.77.99 ;; connection timed out; no servers could be reached ;; connection timed out; no servers could be reached Is that behaviour intended? Is there really no way to gracefully ignore IPv6 when the local network does not support it? I am not the only one to run into this problem. See, for example: http://wiki.kartbuilding.net/index.php/DNS_-_Bind9#Slow_DNS_lookup_issues_with_bind9 http://ubuntuforums.org/showthread.php?t=87798 https://help.ubuntu.com/community/WebBrowsingSlowIPv6IPv4 http://www.ubuntugeek.com/how-to-disable-ipv6-in-ubuntu.html ** Affects: bind9 (Ubuntu) Importance: Undecided Status: New -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
I some posts, I found that ip -6 route may provide useful info. Here is the output: m...@purple:~$ ip -6 r fe80::/64 dev wlan0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 a friend of mine does not have the problem on the LTS version (8.04) of Ubuntu, and a different network. The output of the above on her machine is fe80::/64 dev eth1 metric 256 expires 21330140sec mtu 1500 advmss 1440 hoplimit 4294967295 ff00::/8 dev eth1 metric 256 expires 21330140sec mtu 1500 advmss 1440 hoplimit 4294967295 Could it be that there is something wrong with the IPv6 kernel setup in Karmic/on my system? -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
Yes, the DNS server in my DSL modem does not support IPv6 (A requests ?). I am wondering why 'host' does a IPv6 (AA) lookup after receiving a valid response on IPv4 (AAA request). I try looking into the debug printouts, but did not learn much. I can post the debug-output if it is helpful. Marco. On Mon, Jan 18, 2010 at 3:19 PM, Chuck Short chuck.sh...@canonical.comwrote: I am not able to reproduce this at all. I think you may have problems with your dns server. chuck ** Changed in: bind9 (Ubuntu) Importance: Undecided = Low ** Changed in: bind9 (Ubuntu) Status: New = Incomplete -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a direct subscriber of the bug. -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
Hi Chuck, Attached the debug printout from host -D. The first two files host_before_wait.log and host_all.log are from just running 'host -D www.google.com, while the file host_minus4*.log are from running host -D -4 www.google.com. In each case, the 'before_wait' file is the log up to the moment that the program gets temporarily stuck; it waits about half a second and then later once or twice more. Each time just after printing: unlock_lookup dighost.c:2145 the full log is in the *all.log files. Hope this is useful. Let me know if you need more info. Marco. ** Attachment added: host_before_wait.log http://launchpadlibrarian.net/38900238/host_before_wait.log -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
** Attachment added: host_all.log http://launchpadlibrarian.net/38900244/host_all.log -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
** Attachment added: host_minus4_before_wait.log http://launchpadlibrarian.net/38900252/host_minus4_before_wait.log -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
** Attachment added: host_minus4_all.log http://launchpadlibrarian.net/38900270/host_minus4_all.log -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 504963] Re: [Karmic] host -4 does IPv6 lookup -- times out
A similar issue is discussed here: https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/417757 but I think that's about a different DNS resolver. E.g. in Firefox you can switch off ipv6 lookups and the delay is gone. Also note the comment in that thread: The 5 second lag occurs with the Livebox (used by Orange, 12 million broadband internet customers in Europe). Looks like I'm one of the lucky 12 million :) -- [Karmic] host -4 does IPv6 lookup -- times out https://bugs.launchpad.net/bugs/504963 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
