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[OpenStack Infra <1311987@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/100698

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https://bugs.launchpad.net/bugs/1311987

Title:
  deploy-ironic ramdisks do not boot:  Failed to execute /init (error
  -28)

Status in devstack - openstack dev environments:
  Fix Released
Status in Openstack disk image builder:
  Triaged
Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  The default ubuntu release for ramdisks was bumped to Trusty
  https://review.openstack.org/#/c/88384/  Ironic + devstack deployments
  stopped functioning.  The ramdisk fails to run init, crashing with the
  following error:

  [   23.154016] Failed to execute /init (error -28)
  [   23.154909] Starting init: /sbin/init exists but couldn't execute it (error -28)
  [   23.156388] Starting init: /bin/init exists but couldn't execute it (error -28)
  [   23.157490] Starting init: /bin/sh exists but couldn't execute it (error -28)
  [   23.160313] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/init.txt for guidance.
  [   23.164146] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-24-generic #46-Ubuntu
  [   23.164146] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  [   23.164146]  0000000000000000 ffff88001a3a9ec0 ffffffff81715a64 ffffffff81a39f38
  [   23.164146]  ffff88001a3a9f38 ffffffff8170ec65 0000000000000008 ffff88001a3a9f48
  [   23.164146]  ffff88001a3a9ee8 ffffffff81a39a38 0000000013981396 0000000000001396
  [   23.164146] Call Trace:
  [   23.164146]  [<ffffffff81715a64>] dump_stack+0x45/0x56
  [   23.164146]  [<ffffffff8170ec65>] panic+0xc8/0x1d7
  [   23.164146]  [<ffffffff81703f40>] ? rest_init+0x80/0x80
  [   23.164146]  [<ffffffff81704062>] kernel_init+0x122/0x130
  [   23.164146]  [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0
  [   23.164146]  [<ffffffff81703f40>] ? rest_init+0x80/0x80
  [   23.164146] general protection fault: fff2 [#1] SMP
  [   23.164146] Modules linked in:
  [   23.164146] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.13.0-24-generic #46-Ubuntu
  [   23.164146] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
  [   23.164146] task: ffff88001a3a0000 ti: ffff88001a3a8000 task.ti: ffff88001a3a8000
  [   23.164146] RIP: 0010:[<ffffffff8170ed30>]  [<ffffffff8170ed30>] panic+0x193/0x1d7
  [   23.164146] RSP: 0000:ffff88001a3a9ed0  EFLAGS: 00000246
  [   23.164146] RAX: 0000000014a814a8 RBX: ffffffff81a39f38 RCX: 0000000000000854
  [   23.164146] RDX: 00000000000014a8 RSI: 0000000000000000 RDI: 0000000000000046

  #define ENOSPC      28  /* No space left on device */

  Setting DIB_RELEASE=saucy fixes the issue.    A saucy ramdisk is 83M
  compressed, 238M decompressed.  trusty ramdisk is 87M compressed, 245M
  decompressed.

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