This bug was fixed in the package slof - 20170724+dfsg-1ubuntu0.1
---------------
slof (20170724+dfsg-1ubuntu0.1) artful; urgency=medium
* Fix boot with more than 16 disks (LP: #1734856)
- d/p/0001-boot-do-not-concatenate-bootdev.patch
- d/p/0002-boot-use-a-temporary-bootdev-buf.patch
-- Christian Ehrhardt <christian.ehrha...@canonical.com> Mon, 18 Dec
2017 14:18:30 +0100
** Changed in: slof (Ubuntu Artful)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1734856
Title:
Can't boot VM with more than 16 disks (slof buffer issue)
Status in SLOF - Slimline Open Firmware:
New
Status in The Ubuntu-power-systems project:
Incomplete
Status in slof package in Ubuntu:
Fix Released
Status in slof source package in Xenial:
Fix Committed
Status in slof source package in Zesty:
Fix Committed
Status in slof source package in Artful:
Fix Released
Status in slof source package in Bionic:
Fix Released
Bug description:
[Impact]
* Booting a KVM guest with many disks considered as potential boot device
fails on ppc64le
* In detail this was an overflow, so now the processing of devices is
changed to use dynamic allocation which works with higher numbers of
devices.
[Test Case]
* Comment #12 has the full final testcase, not writing all that up
here again.
[Regression Potential]
* It is a change of disk processing in the slof loader for ppc64el
- that means on one hand only ppc64el will be affected by an issue
- OTOH there might be a disk combination not part of my or upstreams or
IBMs testing that might now fail with the new code (unlikely)
- Given that the change is upstream and was provided by IBM which I
consider the authority on that code I think it is safe to be
considered.
[Other Info]
* n/a
----
== Comment: #0 - RAHUL CHANDRAKAR <rahch...@in.ibm.com> - 2017-11-28 03:40:37
==
---Problem Description---
Can't boot VM with more than 16 disks.
It is an issue with qemu/SLOF (Bug: https://github.com/qemu/SLOF/issues/3)
and it was fixed by Nikunj Amritlal Dadhnia. He has made a patch available and
it has been tested by PowerVC team.
We need this fix in Ubuntu 16.04 and later releases.
Machine Type = 8348-21C (P8 Habanero)
---Steps to Reproduce---
Steps to recreate:
1. Create a VM
2. Attach 50 disks
3. Shutdown from OS
4. Start again and let it boot
---uname output---
Linux neo160.blr.stglabs.ibm.com 4.4.0-101-generic #124-Ubuntu SMP Fri Nov 10
18:29:11 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
---Debugger---
A debugger is not configured
Patch posted and awaiting response...
http://patchwork.ozlabs.org/patch/842011/
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