This turns out to be a kernel issue, either upstream or in Ubuntu.
Bisected to the following, which was released in 3.12.
commit 16203a7a9422315bc929461503e3a046459ea5ff
Author: Rob Landley <r...@landley.net>
Date: Wed Sep 11 14:26:12 2013 -0700
initmpfs: make rootfs use tmpfs when CONFIG_TMPFS enabled
Conditionally call the appropriate fs_init function and fill_super
functions. Add a use once guard to shmem_init() to simply succeed on a
second call.
(Note that IS_ENABLED() is a compile time constant so dead code
elimination removes unused function calls when CONFIG_TMPFS is disabled.)
I agree this is an edge case for tripleO but not so much for general
Ironic usage, as admins should be free to declare nodes with as little
memory as they want, and DIB produced deploy-ironic ramdisks should be
expected to work.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1311987
Title:
deploy-ironic ramdisks do not boot: Failed to execute /init (error
-28)
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