[Bug 1327412] Re: Delay during PXE Boot, IP-Config gives up

[Mathieu Trudel-Lapierre]

@patpat; this is no guesswork. Bits can be missed. While you're right as
to the correct value for yiaddr, I believe that you misunderstand how
klibc on the whole works, and how Ubuntu processes work. The status
change was automatic from the package upload.

Was I was getting at before is that the DHCPDISCOVER messages are going
out correctly -- this is why we shouldn't change yiaddr directly in
dhcp_send -- it affects all send operations indiscriminately. And
obviously, the spec is extremely unclear on the expected behavior.

I've re-read the spec, and it looks like klibc only ever does a discover
and request with the dhcp_send() method; so I'll rework the patch to
make this clear and correctly fix the issue.

This is the kind of package in which you really need to know what you're
doing when making changes. dhcp_send_discover() was doing the right
thing for yiaddr: it sets dev->ip_addr = INADDR_ANY; which value will
get copied in yiaddr in dhcp_send(), "as it should", except that's only
good for dhcp_discover. dhcp_send_request() also needs to keep track of
dev->ip_addr, and shouldn't overwrite it, but still ought to send with
yiaddr set to INADDR_ANY.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to klibc in Ubuntu.
https://bugs.launchpad.net/bugs/1327412

Title:
  Delay during PXE Boot, IP-Config gives up

Status in klibc package in Ubuntu:
  In Progress
Status in klibc source package in Trusty:
  In Progress
Status in klibc source package in Wily:
  In Progress
Status in klibc source package in Xenial:
  In Progress
Status in klibc package in Debian:
  New

Bug description:
  Attempting to PXE boot both the 12.04.3 and 14.04 Live images.   PXE
  boot works normally (PXE Menu, select desired image, image begins
  loading), then the boot process hangs while IP-Config attempts to get
  an IP address:

  IP-Config: eth0 hardware address e0:db:55:0c:34:7e mtu 1500 DHCP
  IP-Config: eth1 hardware address e0:db:55:0c:34:80 mtu 1500 DHCP
  IP-Config: no response after 2 secs - giving up
  IP-Config: eth0 hardware address e0:db:55:0c:34:7e mtu 1500 DHCP
  IP-Config: eth1 hardware address e0:db:55:0c:34:80 mtu 1500 DHCP
  IP-Config: no response after 3 secs - giving up

  These lines appear very quickly (5 seconds has NOT elapsed), after
  about a minute, we get this:

  IP-Config: eth0 hardware address e0:db:55:0c:34:7e mtu 1500 DHCP
  IP-Config: eth1 hardware address e0:db:55:0c:34:80 mtu 1500 DHCP
  IP-Config: no response after 4 secs - giving up

  Some time later, this:

  IP-Config: eth0 hardware address e0:db:55:0c:34:7e mtu 1500 DHCP
  IP-Config: eth1 hardware address e0:db:55:0c:34:80 mtu 1500 DHCP
  IP-Config: no response after 6 secs - giving up

  Until finally, this:

  IP-Config: eth0 hardware address e0:db:55:0c:34:7e mtu 1500 DHCP
  IP-Config: eth1 hardware address e0:db:55:0c:34:80 mtu 1500 DHCP
  IP-Config: no response after 9 secs - giving up
  IP-Config: eth0 hardware address e0:db:55:0c:34:7e mtu 1500 DHCP
  IP-Config: eth1 hardware address e0:db:55:0c:34:80 mtu 1500 DHCP
  IP-Config: eth0 guessed broadcast address 172.25.11.31
  IP-Config: eth0 complete (dhcp from 172.25.10.20):
  (snip)

  While watching the DHCP server logs, Ubuntu is either not sending a
  DHCP Discover at times, or is not replying back with a DHCPRequest
  during these sessions, presumably ignoring an response from the DHCP
  server.  From the initial booting of the system via PXE, to when
  Ubuntu finally shows the desktop, almost 12 minutes will have elapsed.

  I am seeing this same behavior on both 12.04.3 and 14.04.  After
  finding a number of similar erros via Google and no real resolution, I
  have opened this bug.

  The system experiencing this issue has multiple ethernet interfaces
  (actual HW, not a VM), some Google found solutions suggest hard coding
  DEVICE=eth0 in /etc/initramfs-tools/initramfs.conf, however this isn't
  acceptable as a system attempting to PXE boot may be using an
  alternate port for the network.

  I have found what looks to be a very similar bug filed for Debian,
  #584583, which also contains a patch for this issue (under Debian).

  I have no problems in PXE booting to various Windows, RedHat, Centos,
  or Fedora OSs.  Ubuntu is the only Live OS that I'm attempting to boot
  at present.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.2
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.340
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Jun  6 20:22:09 2014
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/1327412/+subscriptions