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-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu. https://bugs.launchpad.net/bugs/1446767 Title: dhclient can fail if other nics are renamed Status in isc-dhcp package in Ubuntu: Fix Released Status in isc-dhcp source package in Trusty: Fix Committed Status in isc-dhcp source package in Vivid: Fix Released Status in isc-dhcp source package in Wily: Fix Released Status in isc-dhcp package in Fedora: Unknown Bug description: === Begin SRU Information === [Impact] Systems that use dhcp for network config combined with network device re-naming can hit a race condition in dhclient which causes dhcp to fail. Any network device renaming could cause this, but the most likely scenario is boot with udev persistent naming in /etc/udev/rules.d/70-persistent-net.rules. This can be a fatal error when network devices that are required for proper function. [Test Case] To recreate the failure: * boot an ubuntu system with an interface that can dhcp * configure /etc/network/interfaces for dhcp on that interface $ grep eth0 /etc/network/interfaces auto eth0 iface eth0 inet dhcp * run attached 'nic-go-crazy' as root in one window/shell this will create by default 10 tuntap devices and repeatedly rename them. * run attached 'ifup-loop eth0' ifup-loop will exit failure if dhclient failed to bring the network up. With the fix provided, this will/should run indefinitely. [Regression Potential] Chance for regression here should be reasonably small. However, a very significant number of systems run dhclient, so any change has to be considered risky. One thing to note, is that Fedora has carried this patch for > 3 years. Per getifaddrs(3): | The getifaddrs() function first appeared in glibc 2.3, but before glibc | 2.3.3, the implementation supported only IPv4 addresses; IPv6 support | was added in glibc 2.3.3. Support of address families other than IPv4 | is available only on kernels that support netlink. These versions are older than any supported Ubuntu release, so that should not be a problem. === End SRU Information === given 3 nics eth0, eth1, eth2 dhclient -1 -v -pf /run/dhclient.eth0.pid -lf /var/lib/dhcp/dhclient.eth0.leases eth0 while that in its early phases, if eth1 is renamed a race condition can cause dhclient to exit failure. This can happen in real life when udev and persistent rules are used. Ie, in a system where eth0 is configured for 'auto' and dhcp and persistent rules cause renaming of devices during boot. I have set up recreate of that more complex system lp:~smoser/+junk/lp1444428 , but this recreate is simpler to catch. example, while running attached 'nic-go-crazy' on other nics, I try ifup eth1 $ sudo ifup eth1 sudo: unable to resolve host ubuntu Internet Systems Consortium DHCP Client 4.3.1 Copyright 2004-2014 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ Error getting interface address for 'nic0317610'; No such device Error getting interface information. If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging.. exiting. Failed to bring up eth1. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: isc-dhcp-client 4.3.1-5ubuntu2 ProcVersionSignature: User Name 3.19.0-15.15-generic 3.19.3 Uname: Linux 3.19.0-15-generic x86_64 ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 Date: Tue Apr 21 16:35:10 2015 DhclientLeases: ProcEnviron: TERM=screen PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: isc-dhcp UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1446767/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
