kernel-packages team mailing list archive

[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

I have prepared a test 3.13 kernel (for Trusty) which reverts the
Ubuntu-specific patch and adds the set of mainline patches that obviate
these issues in Utopic and newer versions.  My cursory testing suggests
that it resolves both this bug ("drops all IPv6 addresses") and the
problem that the Ubuntu-specific patch addressed ("make use_tempaddr
work as documented").

The test kernel package, for Trusty amd64 systems only, is here (install with "dpkg -i thisfile.deb"):
http://kernel.ubuntu.com/~kamal/lp994931-ipv6/linux-image-3.13.0-46-generic_3.13.0-46.75+lp994931_amd64.deb

We'd like feedback from affected parties who can test this on Trusty.
Does that kernel resolve your issue, and do you observe any obvious IP-
related trouble with it?

For reference, the source code branch for that Trusty test kernel is here:
http://kernel.ubuntu.com/git?p=kamal/ubuntu-trusty.git;a=shortlog;h=refs/heads/lp994931-ipv6

A resolution of this issue for 3.2-based Precise is still being
investigated.

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https://bugs.launchpad.net/bugs/994931

Title:
  Altering use_tempaddr drops all IPv6 addresses

Status in The Linux Kernel:
  Invalid
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Precise:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Utopic:
  Invalid

Bug description:
  $ uname -a
  Linux expvr-alnilam 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 UTC 2012 i686 i686 i386 GNU/Linux

  $ sysctl net.ipv6.conf.eth2.use_tempaddr
  net.ipv6.conf.eth2.use_tempaddr = 2
  # (as per the default /etc/sysctl.d/10-ipv6-privacy.conf in 12.04)

  # Add a static IPv6 address:
  $ sudo ip addr add 2001:470:9321:f003::1122/64 dev eth2

  # Verify that it has been set up, and that a temporary address and a SLAAC address also exist:
  $ ip -6 addr list dev eth2
  4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
      inet6 2001:470:9321:f003:74e3:aa2b:7ee5:c002/64 scope global temporary dynamic 
         valid_lft 86393sec preferred_lft 14393sec
      inet6 2001:470:9321:f003:6c97:24ff:fe3f:263b/64 scope global dynamic 
         valid_lft 86393sec preferred_lft 14393sec
      inet6 2001:470:9321:f003::1122/64 scope global 
         valid_lft forever preferred_lft forever
      inet6 fe80::6c97:24ff:fe3f:263b/64 scope link 
         valid_lft forever preferred_lft forever

  # Disable RFC 4941 temporary addresses:
  $ sudo sysctl net.ipv6.conf.eth2.use_tempaddr=0
  net.ipv6.conf.eth2.use_tempaddr = 0

  $ ip -6 addr list dev eth2
  4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
      inet6 fe80::6c97:24ff:fe3f:263b/64 scope link tentative 
         valid_lft forever preferred_lft forever

  I.e. on setting use_tempaddr=0, _all_ IPv6 addresses are removed,
  including statically-configured and non-temporary SLAAC-configured
  addresses.  (The link-local address reappears quickly but the
  'tentative' flag indicates that it has been newly re-added.  The SLAAC
  address reappears after a slightly longer interval as the kernel
  continues to undergo SLAAC, but the static address is gone forever
  unless manually reinstated.)

  The same happens if use_tempaddr is changed from 0 back to 2.

  The expected outcome is that only temporary addresses are affected by a change to use_tempaddr.
  --- 
  AcpiTables:
   
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 May  5 03:53 seq
   crw-rw---T 1 root audio 116, 33 May  5 03:53 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  CurrentDmesg:
   
  DistroRelease: Ubuntu 12.04
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen.linux
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: root=UUID=b16ffd9c-a54a-4dd3-a839-16c382ea8787 ro  console=hvc0
  ProcModules:
   lp 17455 0 - Live 0x00000000
   parport 40930 1 lp, Live 0x00000000
   xenfs 17877 1 - Live 0x00000000
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-24-generic-pae N/A
   linux-backports-modules-3.2.0-24-generic-pae  N/A
   linux-firmware                                1.79
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  precise
  Uname: Linux 3.2.0-24-generic-pae i686
  UpgradeStatus: Upgraded to precise on 2012-05-05 (0 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

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