This bug was fixed in the package initramfs-tools - 0.125ubuntu6
---------------
initramfs-tools (0.125ubuntu6) yakkety; urgency=medium
* Fix case where ip=dhcp and ip=:::::eth0 and other ip= instances exists on
the kernel command line (LP: #1631474)
* Also fixed an error discovered by the shellcheck static code analyzer
where "$DEVICES" would be processed as a single device where-as removing
the quotes allows the list to be correctly processed by the for loop.
-- Dave Chiluk <chi...@ubuntu.com> Fri, 07 Oct 2016 16:21:50 -0500
** Changed in: initramfs-tools (Ubuntu Yakkety)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1631474
Title:
No networking with initramfs-tools 0.122ubuntu8.3 and ip=dhcp boot
option
Status in initramfs-tools package in Ubuntu:
Fix Committed
Status in initramfs-tools source package in Xenial:
Fix Released
Status in initramfs-tools source package in Yakkety:
Fix Released
Status in initramfs-tools source package in Zesty:
Fix Committed
Bug description:
[Impact]
* 0.122ubuntu8.3 of initramfs-tools no longer correctly processed
ip=dhcp or ip=:::::eth0:dhcp
* Regression-updates
* The fix better parses the ip= command line argument.
[Test Case]
* Create a machine that boots using an nfsroot.
* Use ip=:::::eth0:dhcp on the kernel command line. To set up
networking.
* Discover that the device never comes up because, networking is not
configured correctly.
[Regression Potential]
* Regressions potential is limited to machines using
ip={""|::::*|on|any|dhcp} on the kernel command line. As this is
already broken regression potential is minimal. This is common on
machines that use nfsroot or otherwise pxe boot.
[Other Info]
* There are a number of other issues in this code base that are not solved
by this fix.
- The ?*:?*:?*:?*: use case falls through to the default case, and likely
breaks there. As such static assignment via ip= appears broken
-
* The networking configuration does not strictly follow the kernel
documentation as described
https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt . This
should be fixed.
This bug is a regression of changes made under bug 1628306.
====================Original Bug Description Follows==================
initramfs-tools 0.122ubuntu8.3 introduced a serious regression where
networking is not initialized when the boot option "ip=dhcp" is
provided. We are seeing this problem in AWS, but cannot confirm if
this issue is specific to AWS or will occur with different hardware or
in different environments.
Removing "ip=dhcp" from the boot options with 0.122ubuntu8.3 results
in networking being configured.
The issue does not occur with 0.122ubuntu8.2 or previous versions when
"ip=dhcp" is set.
AWS has no console so debugging is not a trivial task. I do have a
console log with some output, and will update this bug shortly with
it.
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