[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[bugproxy]

** Tags removed: targetmilestone-inin---
** Tags added: targetmilestone-inin16044

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Manoj Iyer]

** Changed in: ubuntu-power-systems
   Status: Incomplete => Fix Released

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

This bug was fixed in the package slof - 20161019+dfsg-1ubuntu0.1

---
slof (20161019+dfsg-1ubuntu0.1) zesty; 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   Mon, 18 Dec
2017 14:15:11 +0100

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

This bug was fixed in the package slof - 20151103+dfsg-1ubuntu1.1

---
slof (20151103+dfsg-1ubuntu1.1) xenial; 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   Mon, 18 Dec
2017 14:12:32 +0100

** Changed in: slof (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

** Changed in: slof (Ubuntu Zesty)
   Status: Fix Committed => Fix Released

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Thank you Srikanth (and Team since I saw so many people update the bug).
This is already released for Artful, the SRU Team should soon release it for 
X/Z as well now.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Srikanth Aithal]

verification done on
1. artful
2. xenial
3. zesty
results in comment 32, 45, 46

** Tags removed: verification-needed verification-needed-xenial 
verification-needed-zesty
** Tags added: verification-done verification-done-xenial 
verification-done-zesty

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

It is mostly independent to the kernel, the fix by Nikunj just needs the
new Slof to be on the host.

Please sync internally if the test is correct as this is the fix that
was suggested by you and at least in my tests it worked. Since former
verifications were a bit back and forth and this confusion now looks
similar please make sure what the actual state of this is now on Xeniakl
and Zesty.

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

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   Mon, 18 Dec
2017 14:18:30 +0100

** Changed in: slof (Ubuntu Artful)
   Status: Fix Committed => Fix Released

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Ok, so are all three artful, xenial and zesty done already or are we
waiting on xenial and zesty to complete?

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Thanks for sorting out the Artful test already bssrikanth.

To be clear (the comments by kalshett are unclear to me at least. You need to 
test Xenial/Zesty/Artful HOSTS. The fix is in the slof package that is 
installed in the KVM host.
It actually doesn't even matter which level of guest you start, but you have to 
do it on the host release you verify.

>From my POV verification-needed-xenial was only removed by "you" (=bugproxy) 
>but not yet set to be done (or anything else) and the commends are unclear to 
>me :-/.
I'll fix that up to have it as -needed again.

TL;DR: Yes it is needed for Xenial and Zesty as well.

Once Xenial and Zesty are done as well, then also set the global
verification-done to be complete.

** Tags added: verification-needed-xenial

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Kalpana S Shetty]

Applied artful proposed fixes and could not able to see the reported issue 
fixed.
Help needed to apply artful-proposed fix.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Kalpana S Shetty]

Artful validation:
---
I could able to recreate the issue; 

Initially added upto 32 boot order disks apart from primary disk(boot
order 1), and not able to recreate it. However with one more disks added
with boot dev, could able to create the reported issue.

ubuntu login: root
Password: 
Welcome to Ubuntu 17.10 (GNU/Linux 4.13.0-16-generic ppc64le)

 * Documentation:  https://help.ubuntu.com
 * Management: https://landscape.canonical.com
 * Support:https://ubuntu.com/advantage


46 packages can be updated.
27 updates are security updates.

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

root@ubuntu:~# lsblk
NAMEMAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0  11:01 1024M  0 rom  
vda 252:001M  0 disk 
vdb 252:16   01M  0 disk 
vdc 252:32   01M  0 disk 
vdd 252:48   01M  0 disk 
vde 252:64   01M  0 disk 
vdf 252:80   01M  0 disk 
vdg 252:96   01M  0 disk 
vdh 252:112  01M  0 disk 
vdi 252:128  01M  0 disk 
vdj 252:144  01M  0 disk 
vdk 252:160  01M  0 disk 
vdl 252:176  01M  0 disk 
vdm 252:192  01M  0 disk 
vdn 252:208  01M  0 disk 
vdo 252:224  01M  0 disk 
vdp 252:240  01M  0 disk 
vdq 252:256  01M  0 disk 
vdr 252:272  01M  0 disk 
vds 252:288  01M  0 disk 
vdt 252:304  01M  0 disk 
vdu 252:320  01M  0 disk 
vdv 252:336  01M  0 disk 
vdw 252:352  01M  0 disk 
vdx 252:368  01M  0 disk 
vdy 252:384  01M  0 disk 
vdz 252:400  01M  0 disk 
vdaa252:416  0   50G  0 disk 
├─vdaa1 252:417  07M  0 part 
└─vdaa2 252:418  0   50G  0 part /
vdab252:432  01M  0 disk 
vdac252:448  01M  0 disk 
vdad252:464  01M  0 disk 
vdae252:480  01M  0 disk 
vdaf252:496  01M  0 disk 
vdag252:512  01M  0 disk 

Added one more addition one, 34th boot order disk, could able to
recreate it.

[root@lep8a artful]# vi disk.xml

[root@lep8a artful]# virsh edit kal-artful_vm1
Domain kal-artful_vm1 XML configuration edited.

[root@lep8a artful]# virsh destroy kal-artful_vm1
Domain kal-artful_vm1 destroyed

[root@lep8a artful]# virsh start --console kal-artful_vm1
Domain kal-artful_vm1 started
Connected to domain kal-artful_vm1
Escape character is ^]


SLOF **
QEMU Starting
 Build Date = May 19 2017 07:43:48
 FW Version = mockbuild@ release 20170303
 Press "s" to enter Open Firmware.

Populating /vdevice methods
Populating /vdevice/v-scsi@2000
   SCSI: Looking for devices
  8000 CD-ROM   : "QEMU QEMU CD-ROM  2.5+"
Populating /vdevice/vty@3000
Populating /vdevice/nvram@7100
Populating /pci@8002000
 00 f800 (D) : 1af4 1001virtio [ block ]
 00 f000 (D) : 1af4 1001virtio [ block ]
 00 e800 (D) : 1af4 1001virtio [ block ]
 00 e000 (D) : 1af4 1001virtio [ block ]
 00 d800 (D) : 1af4 1001virtio [ block ]
 00 d000 (D) : 1af4 1001virtio [ block ]
 00 c800 (D) : 1af4 1001virtio [ block ]
 00 c000 (D) : 1af4 1001virtio [ block ]
 00 b800 (D) : 1af4 1001virtio [ block ]
 00 b000 (D) : 1af4 1001virtio [ block ]
 00 a800 (D) : 1af4 1001virtio [ block ]
 00 a000 (D) : 1af4 1001virtio [ block ]
 00 9800 (D) : 1af4 1001virtio [ block ]
 00 9000 (D) : 1af4 1001virtio [ block ]
 00 8800 (D) : 1af4 1001virtio [ block ]
 00 8000 (D) : 1af4 1001virtio [ block ]
 00 7800 (D) : 1af4 1001virtio [ block ]
 00 7000 (D) : 1af4 1001virtio [ block ]
 00 6800 (D) : 1af4 1001virtio [ block ]
 00 6000 (D) : 1af4 1001virtio [ block ]
 00 5800 (D) : 1af4 1001virtio [ block ]
 00 5000 (D) : 1af4 1001virtio [ block ]
 00 4800 (D) : 1af4 1001virtio [ block ]
 00 4000 (D) : 1af4 1001virtio [ block ]
 00 3800 (D) : 1af4 1001virtio [ block ]
 00 3000 (D) : 1af4 1001virtio [ block ]
 00 2800 (B) : 1b36 0001pci*
 01 3800 (D) : 1af4 1001virtio [ block ]
 01 3000 (D) : 1af4 1001virtio [ block ]
  

[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[bugproxy]

** Tags removed: verification-needed-xenial

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Brian Murray]

Hello bugproxy, or anyone else affected,

Accepted slof into artful-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/slof/20170724+dfsg-
1ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-artful to verification-done-artful. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-artful. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: slof (Ubuntu Artful)
   Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-artful

** Changed in: slof (Ubuntu Zesty)
   Status: In Progress => Fix Committed

** Tags added: verification-needed-zesty

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Tests good - MPs open for packaging review

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

MPs for the packaging change in X/Z/A up for review and linked in the
bug.

** Changed in: slof (Ubuntu Artful)
   Status: Confirmed => In Progress

** Changed in: slof (Ubuntu Zesty)
   Status: Confirmed => In Progress

** Changed in: slof (Ubuntu Xenial)
   Status: Confirmed => In Progress

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Doing another bigger check set on Xenial and then opening up the MPs for
review.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

** Merge proposal linked:
   
https://code.launchpad.net/~paelzer/ubuntu/+source/slof/+git/slof/+merge/335317

** Merge proposal linked:
   
https://code.launchpad.net/~paelzer/ubuntu/+source/slof/+git/slof/+merge/335318

** Merge proposal linked:
   
https://code.launchpad.net/~paelzer/ubuntu/+source/slof/+git/slof/+merge/335319

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

This bug was fixed in the package slof - 20170724+dfsg-1ubuntu1

---
slof (20170724+dfsg-1ubuntu1) bionic; 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   Wed, 13 Dec
2017 14:46:58 +0100

** Changed in: slof (Ubuntu Bionic)
   Status: Fix Committed => Fix Released

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

I saw the new upstream release, over the next time this will be picked up by 
Debian and we make it a sync again then.
For now I pick the fix as tested from the ppa into Bionic.
Once that migrated I'll look at the SRUs into X-A.

** Changed in: slof (Ubuntu Bionic)
   Status: Incomplete => Fix Committed

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Nikunj A Dadhania]

On my test environment with the extracted slof.bin from the DEB package,
I do not see the issue.

./ppc64-softmmu/qemu-system-ppc64 -nographic -nodefaults -serial stdio -monitor 
pty -m 2G -device virtio-scsi-pci`for ((i=2;i<=30;i++)) ; do echo -n "  
-drive file=/tmp/storage$i.qcow2,if=none,id=drive$i,format=qcow2 -device 
scsi-hd,drive=drive$i,id=disk$i,channel=0,scsi-id=0,lun=$i,bootindex=$i"; 
done;` -drive 
file=../../imgs/guest.disk,if=none,id=drv1,format=qcow2,cache=none -device 
scsi-hd,drive=drv1 -device virtio-scsi-pci `for ((i=31, j=1;i<=50;i++,j++)) ; 
do echo -n "  -drive file=/tmp/storage$i.qcow2,if=none,id=drive$i,format=qcow2 
-device 
scsi-hd,drive=drive$i,id=disk$i,channel=0,scsi-id=1,lun=$j,bootindex=$i"; done;`
qemu-system-ppc64: -monitor pty: char device redirected to /dev/pts/1 (label 
compat_monitor0)


SLOF **
QEMU Starting
 Build Date = Dec 13 2017 13:46:58
 FW Version = buildd@ release 20170724
 Press "s" to enter Open Firmware.


Boots fine, I have asked Rahul to verify as well in his environment.

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

My former tests focussed on the testcase.
I deployed a fresh power8 system and ran some more tests on the proposed change 
but found no issues - that said going on.

That said I pushed an MP for review of the packaging changes.

@Nikunj / IBM - waiting on your check of the PPA as well if you can find
the time before the final upload.

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: slof (Ubuntu Artful)
   Status: New => Confirmed

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: slof (Ubuntu Zesty)
   Status: New => Confirmed

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: slof (Ubuntu Xenial)
   Status: New => Confirmed

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Thanks for the info Nikunj.
That means we can likely soon pick it up as a sync from Debian again.
But for now can fix it by picking your changes.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Nikunj A Dadhania]

@paelzer Had a discussion with Alexey, he has created a release label

https://github.com/aik/SLOF/commit/fa981320a1e0968d6fc1b8de319723ff8212b337

Waiting for the mirror to happen on
https://git.qemu.org/?p=SLOF.git;a=commit;h=HEAD

Once that happens, he will send a slof update patch to the qemu mailing.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Launchpad Bug Tracker]

** Merge proposal linked:
   
https://code.launchpad.net/~paelzer/ubuntu/+source/slof/+git/slof/+merge/335202

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

** Description changed:

+ [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  - 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) 
-  
+ 
+ Machine Type = 8348-21C (P8 Habanero)
+ 
  ---Steps to Reproduce---
-  Steps to recreate:
+  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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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

It was still working with 20 disks and boot index, but 48 made it.
Thanks Nikunj for the bood index hint.

Overall testcase:
# Prep a guest
$ uvt-simplestreams-libvirt --verbose sync --source 
http://cloud-images.ubuntu.com/daily arch=ppc64el label=daily release=bionic
$ uvt-kvm create --password=ubuntu bionic-testguest release=bionic arch=ppc64el 
label=daily

Use `virsh edit bionic-testguest` to do the following three steps:
1. Remove in the os section
  

2. Add this on your former primary disk:
  

3. And then add the xml content generated with:
$ echo "" > disk.xml;
$ for i in {1..24}; do
  h=$(printf "\x$(printf %x $((98+$i)))")
  echo "" >> disk.xml
  qemu-img create -f qcow2 
/var/lib/uvtool/libvirt/images/cpaelzer-bionic-t$i.qcow 1M
  echo "" >> disk.xml
  qemu-img create -f qcow2 
/var/lib/uvtool/libvirt/images/cpaelzer-bionic-tb$i.qcow 1M
done

That makes up for 48 extra disks and the two base devices.
Then run it into console to trigger the bug:

$ virsh start --console artful-testguest
( 300 ) Data Storage Exception [ 1dc4a018 ]


R0 .. R7   R8 .. R15 R16 .. R23 R24 .. R31
1dbe2544   1e462008      1dc04c00   
1e665ff0   1dc5e248      1dc09268   
1dc0ed00   1dc4a010      0003   
0054   1e6663f5      f001   
1dc5e1c0   005b   1dc09438      
1dc4a018      8000   1e462010   
1dc4a018      f003   1dbe46d4   
1e462010      0006   4038303030303030   

CR / XER   LR / CTR  SRR0 / SRR1DAR / DSISR
8404   1dbe4ec0   1dbe4700   4038303030303030   
2000   1dbe46d4   80001000   4000


That error was reproducible on several restarts.
Then I installed the PPA and rerun it which now worked to be a successful boot 
again.

Prepping SRU Template with that info.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Nikunj A Dadhania]

@paelzer you need to have boot order in each of these disk



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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Tried the base 2 + 2x20 = 42 disks.
Still working for me as-is.

To summarize what I wait on:
1. better steps to reproduce - if possible slight modification to my suggested 
workflow and even more so if possible without needing double digit amount of 
real disks
2. please test/verify the ppa linked in comment #8 in your environment

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

I tried to verify the case and fix myself which is a prereq for good steps to 
reproduce for the SRU anyway.
I came up with test steps based on what was initially reported.
$ uvt-simplestreams-libvirt --verbose sync --source 
http://cloud-images.ubuntu.com/daily arch=ppc64el label=daily release=bionic
$ uvt-kvm create --password=ubuntu cpaelzer-bionic release=bionic arch=ppc64el 
label=daily
$ for i in {1..20}; do
  h=$(printf "\x$(printf %x $((98+$i)))");
  echo "" > disk.xml;
  qemu-img create -f qcow2 
/var/lib/uvtool/libvirt/images/cpaelzer-bionic-t$i.qcow 1M;
  virsh attach-device artful-testguest disk.xml;
done
$ virsh console 
# in guest then
$ sudo reboot

That works for me with overall 22 disks.
I see a bunch of those:
  virtioblk_transfer: Access beyond end of device!
  virtioblk_transfer failed! type=0, status = 1

But it boots fine still and all disks are attached just fine.
If instead I add all disks to the device statically before starting it it is 
the same.
Do I just need more devices - any options to be set?

Please also help to provide working steps to reproduce (that if possible
does not contain having 20+ real disks reachable).

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Hi,
I don't want to wait too long, so while waiting for an answer I made a ppa 
available that should be tested to confirm this fix is good (for bionic).
Please test on Bionic from ppa: 
https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/3079

I'll mark the bug incomplete to clearly reflect I wait on an answer.

Having that verified unblocks me from uploading it and that will unblock
the SRUs considerations according to the policy.

** Changed in: slof (Ubuntu Bionic)
   Status: Triaged => Incomplete

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

@Nikunj - do you happen to know if Alexey is planning an official
release soon that would include this fix?


Note: this is the first Delta to take, but I look into it as it is critical.
We want to get back to have upstream release a version, debian pick it up and 
we become a sync again in bionic.

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Title:
  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Thanks for the ping Nikunj!

** Changed in: slof (Ubuntu Bionic)
   Status: New => Triaged

** Tags added: slof-18.04

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Andrew Cloke]

Marking as "incomplete" until patch lands upstream.

** Changed in: ubuntu-power-systems
   Status: New => Incomplete

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  Can't boot VM with more than 16 disks (slof buffer issue)

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Bug Watch Updater]

** Changed in: slof
   Status: Unknown => New

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Also linked up the GH issue and the SLOF project in general.
We should get auto-updates once resolved, but to be sure @nikunj please feel 
free to ping here once the discussion on the patch concludes and is committed 
upstream.

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[ChristianEhrhardt]

Thanks for the bug, I see the patch is under active discussion atm.
Lets take a look to integrate once that discussion concludes.

Since it is packaged in slof I assigned that as the target and opened up
per release tasks.

** Package changed: qemu (Ubuntu) => slof (Ubuntu)

** Also affects: slof (Ubuntu Xenial)
   Importance: Undecided
   Status: New

** Also affects: slof (Ubuntu Bionic)
   Importance: Critical
 Assignee: David Britton (davidpbritton)
   Status: New

** Also affects: slof (Ubuntu Artful)
   Importance: Undecided
   Status: New

** Also affects: slof (Ubuntu Zesty)
   Importance: Undecided
   Status: New

** Bug watch added: github.com/qemu/SLOF/issues #3
   https://github.com/qemu/SLOF/issues/3

** Also affects: slof via
   https://github.com/qemu/SLOF/issues/3
   Importance: Unknown
   Status: Unknown

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Manoj Iyer]

** Changed in: qemu (Ubuntu)
 Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => 
David Britton (davidpbritton)

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Critical

** Tags added: triage-g

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[Bug 1734856] Re: Can't boot VM with more than 16 disks (slof buffer issue)

[Frank Heimes]

** Also affects: ubuntu-power-systems
   Importance: Undecided
   Status: New

** Changed in: ubuntu-power-systems
   Importance: Undecided => Critical

** Changed in: ubuntu-power-systems
 Assignee: (unassigned) => Canonical Server Team (canonical-server)

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