[Bug 1202203] Re: Connection requests to saucy server VMs from a hosts fail after fresh preseeded VM installs

[Parameswaran Sivatharman]

So the bug could not be reproduced in a number of runs with preseeds
having the following late command to disable apparmor

d-i preseed/late_command string in-target sed -i 's/quiet/quiet
apparmor=0/' /boot/grub/grub.cfg

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https://bugs.launchpad.net/bugs/1202203

Title:
  Connection requests to saucy server VMs from a hosts fail after fresh
  preseeded VM installs

Status in “isc-dhcp” package in Ubuntu:
  New

Bug description:
  Reporting a new bug since the fix for bug 1197484, as suspected, did
  not fix the issue. I am reporting again against isc-dhcp but the issue
  appeared for the first time when Linux version 3.10.0-2-generic was
  first used. Also, using utah this is easily reproducible irrespective
  of the host ( confirmed on precise and raring hosts) and appears to
  only happen during the first boot after the installation. I say this
  because, I tried to reboot an impacted VM a number of times (after
  sudo ifdown eth0 and sudo ifup eth0) but could not reproduce the
  issue.  Logging into an impacted system, running ifconfig does not
  list an ipv4 address for eth0, when the issue occurs.

  Summary of the issue:
  The ssh/ ping requests from the host to the client VMs of preseeded saucy server installations fail on first reboot after fresh installations of 20130703 images onwards. The ping requests to the IP address allocated to the VMs during the installations fail with 'Destination Host Unreachable'. There does not appear to be anything wrong during installations.
  The VMs use libvirt/KVM and using bridged interface. This issue happens not always but most of the time. With isc-dhcp - 4.2.4-7ubuntu3 we do NOT see the 'dhclient: execve (/sbin/dhclient-script, ...): Permission denied' in the boot log but still see 

  Jul 17 03:59:55 utah-11601-saucy-server-i386 kernel: [   13.514969]
  type=1400 audit(1374047995.545:11): apparmor="DENIED"
  operation="file_mmap" parent=488 profile="/sbin/dhclient"
  name="/bin/bash" pid=591 comm="dhclient-script" requested_mask="m"
  denied_mask="m" fsuid=0 ouid=0

  The installer syslog and boot log of one of the latest failures are
  attached.

  ==============================================
  How to reproduce:
  1. Install utah using
     sudo apt-add-repository -y ppa:utah/stable
     sudo apt-get update
     sudo apt-get install utah

  2. Now run the installation test using
  sudo -u utah -i run_utah_tests.py -i /path/to/saucy-server-amd64.iso -p lp:ubuntu-test-cases/server/preseeds/mail-server.preseed lp:ubuntu-test-cases/server/runlists/mail-server.run -x /etc/utah/bridged-network-vm.xml

  3. Now it could be seen that the the connection to the VMs from the
  host after the installation fails.

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