[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Mathieu Trudel-Lapierre]

Just uploaded it to the trusty queue again, I'll get someone to review
it and accept the upload.

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Ivan Suzdal]

Hi all!
Any ETA with series file? Can I help you somehow?

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Ivan Suzdal]

Looks like you forgot to add nvme patch to debian/patches/series
# ls debian/patches/ | grep nvme
dm-multipath-backlist-nvme-5c412e47.patch
# grep nvme debian/patches/series
# 


** Tags removed: verification-needed
** Tags added: verification-failed

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Brian Murray]

Hello Ivan, or anyone else affected,

Accepted multipath-tools into trusty-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/multipath-
tools/0.4.9-3ubuntu7.10 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 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 to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

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

** Changed in: multipath-tools (Ubuntu Trusty)
   Status: Triaged => Fix Committed

** Tags added: verification-needed

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Mathieu Trudel-Lapierre]

** Description changed:

+ [Impact]
+ Users expecting to use multipath over NVMe device will notice hangs with any 
software attempting to use the device-mapper devices (/dev/dm-* or 
/dev/mapper/mpath*).
+ 
+ [Test case]
+ 1) Setup multipath over nvme. (should not be possible with the patch in)
+ 2) Run kpartx -av /dev/dm-device-mulipath-over-nvme   (will hang without the 
patch)
+ 
+ [Regression Potential]
+ Minimal. This removes a theoretically valid use case of multipath devices 
using NVMe disks, which is not technically supported and leads to software 
hangs (and thus installs will not complete, and setting up multipath over NVMe 
post-install would hang).
+ This only affects nvme devices; so any storage device using the "nvme" naming 
would no longer be able to setup multipath even if technical specifications 
were to change sufficiently to support multipath over NVMe (or if some other 
device starts using this naming which isn't affected by the same limitations).
+ 
+ 
+ -
+ 
  When on bare metal uses NVMe devices - kpartx cause kernel oops.
  http://paste.openstack.org/show/488638/
  
  Also any tools which works with disks (e.g. fdisk, lsblk) hangs in D state 
(uninterruptible sleep) while trying to to read /dev/dm-X.
  This bug is already described and fixed in upstream 
(http://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commitdiff;h=5c412e47e589b5325ed7de6cba86d906a671d9df)
  
  I made patches for trusty and xenial versions of multipath-tools.
  Patches which fix issue is in attach.
  Could you apply this patches please, at least for trusty version?

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Launchpad Bug Tracker]

This bug was fixed in the package multipath-tools - 0.5.0-7ubuntu16

---
multipath-tools (0.5.0-7ubuntu16) xenial; urgency=medium

  * debian/patches/dm-multipath-backlist-nvme-5c412e47.patch: blacklist NVMe
from multipath, otherwise kpartx calls will hang. This is because mpath
works at the request level (which NVMe bypasses), so multipathing is not
supported on NVMe. (LP: #1551828)

 -- Mathieu Trudel-Lapierre   Tue, 01 Mar 2016
11:55:13 -0500

** Changed in: multipath-tools (Ubuntu)
   Status: In Progress => Fix Released

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Ivan Suzdal]

** Description changed:

- When on bare metal uses NVMe devices - kpartx cause kernel oops. Also any 
tools which works with disks (e.g. fdisk, lsblk) hangs in D state 
(uninterruptible sleep) while trying to to read /dev/dm-X.
+ When on bare metal uses NVMe devices - kpartx cause kernel oops.
+ http://paste.openstack.org/show/488638/
+ 
+ Also any tools which works with disks (e.g. fdisk, lsblk) hangs in D state 
(uninterruptible sleep) while trying to to read /dev/dm-X.
  This bug is already described and fixed in upstream 
(http://git.opensvc.com/gitweb.cgi?p=multipath-tools/.git;a=commitdiff;h=5c412e47e589b5325ed7de6cba86d906a671d9df)
  
  I made patches for trusty and xenial versions of multipath-tools.
  Patches which fix issue is in attach.
  Could you apply this patches please, at least for trusty version?

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Mathieu Trudel-Lapierre]

Yeah, this is pretty bad and the fixes are obviously right; I'll upload
to xenial now and ship the trusty update with another SRU I was already
preparing.

** Also affects: multipath-tools (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** Changed in: multipath-tools (Ubuntu Trusty)
 Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

** Changed in: multipath-tools (Ubuntu)
   Importance: Undecided => High

** Changed in: multipath-tools (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: multipath-tools (Ubuntu)
   Status: New => In Progress

** Changed in: multipath-tools (Ubuntu Trusty)
   Status: New => Triaged

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Brian Murray]

Could you have a look at this Mathieu?

** Changed in: multipath-tools (Ubuntu)
 Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

** Changed in: multipath-tools (Ubuntu)
 Assignee: Mathieu Trudel-Lapierre (mathieu-tl) => (unassigned)

** Changed in: multipath-tools (Ubuntu)
 Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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[Bug 1551828] Re: kpartx causes kernel oops when NVMe devices is not in blacklist

[Ubuntu Foundations Team Bug Bot]

The attachment "trusty nvme blacklist" seems to be a patch.  If it
isn't, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are a member of the ~ubuntu-reviewers,
unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issues please contact him.]

** Tags added: patch

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Title:
  kpartx causes kernel oops when NVMe devices is not in blacklist

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