Ubuntu
linux package

NVDIMM-N doesn't work properly on Dell EMC PowerEdge R840

Bug #1811785 reported by JulietDeltaGolf on 2019-01-15

This bug affects 2 people

	Status	Importance	Assigned to
ndctl	Fix Released	Unknown	auto-github-pmem-ndctl #78
linux (Ubuntu)	Fix Released	Undecided	Unassigned
ndctl (Ubuntu)	Fix Released	Undecided	Unassigned
Bionic	Incomplete	Medium	Unassigned
Disco	Won't Fix	Medium	Unassigned
Eoan	Fix Released	Undecided	Unassigned

Bug Description

On ubuntu 18.04.1 :

1°) With 4.15.0-43 two default namespaces in raw mode are visible while there shouldn't be any but no settings change could be applied.

root@server:~# ndctl list -R
[
  {
    "dev":"region1",
    "size":103079215104,
    "available_size":0,
    "type":"pmem",
    "numa_node":1,
    "persistence_domain":"unknown"
  },
  {
    "dev":"region0",
    "size":103079215104,
    "available_size":0,
    "type":"pmem",
    "numa_node":0,
    "persistence_domain":"unknown"
  }
]

root@server:~# ndctl list
[
  {
    "dev":"namespace1.0",
    "mode":"raw",
    "size":103079215104,
    "sector_size":512,
    "blockdev":"pmem1",
    "numa_node":1
  },
  {
    "dev":"namespace0.0",
    "mode":"raw",
    "size":103079215104,
    "sector_size":512,
    "blockdev":"pmem0",
    "numa_node":0
  }
]

root@server:~# ndctl create-namespace --reconfig=namespace1.0 --type=pmem --mode=sector -f
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem7: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem9: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem6: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem11: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
libndctl: sizeof_namespace_index: nmem8: label area (1024) too small to host (256 byte) labels
failed to reconfigure namespace: No such device

2°) With 4.18.0-13 no active namespaces are seen which seems more coherent for non initialized NVDIMM-N with labels but no namespace can be created.

Both patches (kernel & ndctl) listed in the github issue below needs to be applied in order to get them working properly. Tested against the current hwe 4.18 kernel.

https://github.com/pmem/ndctl/issues/78
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jan 15 10:55 seq
crw-rw---- 1 root audio 116, 33 Jan 15 10:55 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 18.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: Dell Inc. PowerEdge R840
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: ndctl 61.2-0ubuntu1~18.04.1
PackageArchitecture: amd64
PciMultimedia:

ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/ROOT/ubuntu@/boot/vmlinuz-4.15.0-43-generic root=ZFS=rpool/ROOT/ubuntu ro
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-43-generic N/A
linux-backports-modules-4.15.0-43-generic N/A
linux-firmware 1.173.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags: bionic
Uname: Linux 4.15.0-43-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

_MarkForUpload: True
dmi.bios.date: 11/21/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.9
dmi.board.name: 08XR9M
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.9:bd11/21/2018:svnDellInc.:pnPowerEdgeR840:pvr:rvnDellInc.:rn08XR9M:rvrA01:cvnDellInc.:ct23:cvr:
dmi.product.family: PowerEdge
dmi.product.name: PowerEdge R840
dmi.sys.vendor: Dell Inc.

See original description

Tags:

Related branches

~rafaeldtinoco/ubuntu/+source/ndctl:lp1811785-bionic

Rejected for merging into ubuntu/+source/ndctl:ubuntu/bionic-devel

Rafael David Tinoco (community): Needs Fixing on 2019-11-25

Christian Ehrhardt  (community): Needs Fixing on 2019-11-25

~rafaeldtinoco/ubuntu/+source/ndctl:lp1811785-disco

Rejected for merging into ubuntu/+source/ndctl:ubuntu/disco-devel

Rafael David Tinoco (community): Needs Fixing on 2019-11-25

Christian Ehrhardt  (community): Needs Fixing on 2019-11-25

Revision history for this message

Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote on 2019-01-15: Missing required logs.

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1811785

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

Changed in linux (Ubuntu):
status:	New → Incomplete

Revision history for this message

JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: CRDA.txt

CRDA.txt Edit (468 bytes, text/plain)

apport information

information type:	Public → Public Security
information type:	Public Security → Private Security
information type:	Private Security → Public Security
information type:	Public Security → Public
tags:	added: apport-collected bionic
description:	updated

Revision history for this message

JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: CurrentDmesg.txt

CurrentDmesg.txt Edit (707.9 KiB, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: Dependencies.txt

Dependencies.txt Edit (247 bytes, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: Lspci.txt

Lspci.txt Edit (561.2 KiB, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: Lsusb.txt

Lsusb.txt Edit (372 bytes, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: ProcCpuinfoMinimal.txt

ProcCpuinfoMinimal.txt Edit (1.4 KiB, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: ProcInterrupts.txt

ProcInterrupts.txt Edit (5.2 MiB, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: ProcModules.txt

ProcModules.txt Edit (6.2 KiB, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: UdevDb.txt

#10

UdevDb.txt Edit (6.1 MiB, text/plain)

apport information

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JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-15: WifiSyslog.txt

#11

WifiSyslog.txt Edit (1.4 MiB, text/plain)

apport information

Changed in linux (Ubuntu):
status:	Incomplete → Confirmed

Bug Watch Updater (bug-watch-updater) on 2019-01-15

Changed in ndctl:
status:	Unknown → New

Revision history for this message

JulietDeltaGolf (julietdeltagolf) wrote on 2019-01-18:

#12

In case anybody else runs into this issue, here's some things you could do :

On 4.15, you can reconfigure the namespace with ndctl by adding '--no-autolabel' to the command line. You'll still have to find a way to make the namespaces configuration persistent across boots since you're not making uses of the labels.

On 4.18, if you use a fixed kernel + fixed ndctl to setup the namespace(s), the configuration will be properly read at boot by the current linux hwe 4.18 kernel.

Bug Watch Updater (bug-watch-updater) on 2019-02-01

Changed in ndctl:
status:	New → Fix Released

Revision history for this message

Jerry Clement (jerry-clement) wrote on 2019-02-06:

#13

Missing Kernel Fix?

Revision history for this message

JulietDeltaGolf (julietdeltagolf) wrote on 2019-02-12:

#14

Everything is explained in the ndctl issue 78.

Revision history for this message

Launchpad Janitor (janitor) wrote on 2019-09-18:

#15

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

Changed in ndctl (Ubuntu):
status:	New → Confirmed

Revision history for this message

torel (torehl) wrote on 2019-09-26:

#16

Needed --no-autolabel to get it working. New ndctl didn't help. Which is nice as I didn't have to interrupt metadata operations of the servers with nvdimm's.

# uname -ar
Linux localhost 4.15.0-60-generic #67-Ubuntu SMP Thu Aug 22 16:55:30 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
# ndctl create-namespace --no-autolabel --mode fsdax --map dev -e namespace0.0 -f -vvv
# ndctl create-namespace --no-autolabel --mode fsdax --map dev -e namespace1.0 -f -vvv
# mkfs.xfs -f -m reflink=0 -L PMEM0 /dev/pmem0
# mkfs.ext4 -L PMEM1 -F /dev/pmem1
# mount -o dax /dev/pmem1 /mnt/pmem1-ext4/
# mount -o dax /dev/pmem0 /mnt/pmem0-xfs
# mount | grep dax
/dev/pmem0 on /mnt/pmem0-xfs type xfs (rw,relatime,attr2,dax,inode64,noquota)
/dev/pmem1 on /mnt/pmem1-ext4 type ext4 (rw,relatime,dax,data=ordered)

Nice if this could be fixed in kernels above 4.15.0-62. Thx!

Revision history for this message

Rafael David Tinoco (rafaeldtinoco) wrote on 2019-11-23:

#17

libndctl: sizeof_namespace_index: nmem10: label area (1024) too small to host (256 byte) labels

This issue is fixed by:

commit 9c6aae5
Author: Dan Williams <email address hidden>
Date: Tue Jan 15 01:51:45 2019

ndctl/init-labels: Fix label slot accounting per UEFI 2.7

Quoting from Linux kernel commit 9e694d9c18dd "libnvdimm, label: change
nvdimm_num_label_slots per UEFI 2.7":

        sizeof_namespace_index() fails when NVDIMM devices have the minimum
        1024 bytes label storage area. nvdimm_num_label_slots() returns 3
        slots while the area is only big enough for 2 slots.

Change nvdimm_num_label_slots() to calculate a number of label slots
according to UEFI 2.7 spec.

Without this fix attempts to initialize labels on a small (1K) label
area results in the following:

libndctl: sizeof_namespace_index: nmem2: label area (1024) too small to host (128 byte) labels
libndctl: sizeof_namespace_index: nmem2: label area (1024) too small to host (256 byte) labels

    Based on an original patch by Toshi Kani
    Fixes: bdaec95463ca ("ndctl: introduce ndctl_dimm_{validate_labels,init_labels}")
    Reported-by: Sujith Pandel <email address hidden>
    Link: https://github.com/pmem/ndctl/issues/78
    Signed-off-by: Dan Williams <email address hidden>
    Signed-off-by: Vishal Verma <email address hidden>

Upstream.

Changed in linux (Ubuntu):
status:	Confirmed → Invalid
Changed in ndctl (Ubuntu):
importance:	Undecided → Medium
assignee:	nobody → Rafael David Tinoco (rafaeldtinoco)

Revision history for this message

Rafael David Tinoco (rafaeldtinoco) wrote on 2019-11-23:

#18

It fixes an issue introduced by :

Patch: bdaec95463ca

In version v58

And the fix (9c6aae5) was introduced in v64.

$ rmadison ndctl

Bionic and Disco are affected.

no longer affects:	linux (Ubuntu Bionic)
no longer affects:	linux (Ubuntu Disco)
no longer affects:	linux (Ubuntu Eoan)
Changed in ndctl (Ubuntu):
status:	Confirmed → Fix Released
Changed in ndctl (Ubuntu Eoan):
status:	New → Fix Released
Changed in ndctl (Ubuntu Disco):
status:	New → Confirmed
Changed in ndctl (Ubuntu Bionic):
status:	New → Confirmed
Changed in ndctl (Ubuntu):
assignee:	Rafael David Tinoco (rafaeldtinoco) → nobody
Changed in ndctl (Ubuntu Bionic):
assignee:	nobody → Rafael David Tinoco (rafaeldtinoco)
Changed in ndctl (Ubuntu Disco):
assignee:	nobody → Rafael David Tinoco (rafaeldtinoco)
Changed in ndctl (Ubuntu):
importance:	Medium → Undecided
Changed in ndctl (Ubuntu Disco):
importance:	Undecided → Medium
Changed in ndctl (Ubuntu Bionic):
importance:	Undecided → Medium

Revision history for this message

Rafael David Tinoco (rafaeldtinoco) wrote on 2019-11-23:

#19

A PPA containing the fixes (Disco and Bionic) will be available here:

https://launchpad.net/~rafaeldtinoco/+archive/ubuntu/lp1811785

Revision history for this message

Rafael David Tinoco (rafaeldtinoco) wrote on 2019-11-23:

#20

Hello Torel and Juliet,

If possible, could you please test the PPA above with either Bionic and/or Disco and make sure the packages fix the issue ? I'm preparing bdctl to be in "main" pocket for 20.04:

https://bugs.launchpad.net/ubuntu/+source/ndctl/+bug/1853506

and having this case fix would help to get traction in the MIR (main inclusion request).

Thank you very much for reporting this and contributing to Ubuntu.

Changed in ndctl (Ubuntu Bionic):
status:	Confirmed → In Progress
Changed in ndctl (Ubuntu Disco):
status:	Confirmed → In Progress

Revision history for this message

Rafael David Tinoco (rafaeldtinoco) wrote on 2019-11-25:

#21

The kernel issue pointed at the github was solved by:

commit cbaee3aa0e23
Author: Dan Williams <email address hidden>
Date: Thu Feb 7 20:56:50 2019

acpi/nfit: Fix bus command validation

BugLink: https://bugs.launchpad.net/bugs/1821607

in kernel: Ubuntu-5.0.0-9.10 (Disco)

AND

commit 3b8d3410b3d8
Author: Dan Williams <email address hidden>
Date: Thu Feb 7 20:56:50 2019

acpi/nfit: Fix bus command validation

BugLink: https://bugs.launchpad.net/bugs/1837952

commit ebe9f6f19d80d8978d16078dff3d5bd93ad8d102 upstream.

in kernel: Ubuntu-4.15.0-59.66 (Bionic)

So kernel part is good.... (or kind of.. actually it is missing 2 fixes on top of that):

----

TODO: KERNEL TEAM SHOULD BACKPORT THIS TO BIONIC AND DISCO:

commit ebe9f6f19d80
Author: Dan Williams <email address hidden>
Date: Thu Feb 7 20:56:50 2019

acpi/nfit: Fix bus command validation

Fixes: 11189c1089da ("acpi/nfit: Fix command-supported detection")

commit 0171b6b78131
Author: Dan Williams <email address hidden>
Date: Sun Feb 3 17:17:27 2019

acpi/nfit: Require opt-in for read-only label configurations

Fixes: 11189c1089da ("acpi/nfit: Fix command-supported detection")

TO FIX THE ISSUE'S FIX

-----

TODO: FEEDBACK ABOUT PROPOSED USERLAND FIX

and the userland fix was, indeed, the ndctl patch I did a SRU for.

UNFORTUNATELY I can't reproduce the issue with QEMU. I have tried different label sizes in multiple attempts and wasn't able to cause the labeling error (making sure it was fixed). With that it is hard for me to guarantee the fix is good and I'll depend on a feedback from reporter.

There is a PPA in comment #19 containing the fix. I'll flag this case as incomplete while I have no feedback, as we wouldn't be able to verify the fix in order for it to land -updates archive.

Nevertheless, documentation here might be important to others, in order to understand the errors.

Changed in linux (Ubuntu):
status:	Invalid → Fix Released
Changed in ndctl (Ubuntu Bionic):
assignee:	Rafael David Tinoco (rafaeldtinoco) → nobody
Changed in ndctl (Ubuntu Disco):
assignee:	Rafael David Tinoco (rafaeldtinoco) → nobody
Changed in ndctl (Ubuntu Bionic):
status:	In Progress → Incomplete
Changed in ndctl (Ubuntu Disco):
status:	In Progress → Incomplete

Revision history for this message

Rafael David Tinoco (rafaeldtinoco) wrote on 2019-11-25:

#22

TODOs in this bug:

- End user must confirm the issue is still reproducible and test PPA package
- Mark the case as Confirmed again (instead of Incomplete)
- From that point, the SRU would continue (merge requests already present in this bug)
- Patches would be sent out to kernel team for inclusion in the next SRU

Revision history for this message

torel (torehl) wrote on 2019-12-05:

#23

Tested latest kernel 4.15.0-72-generic on bionic.

root@srl-mds1:~# dpkg -l | grep -i ndctl
ii libndctl6 61.2-0ubuntu1~18.04.1 amd64 Utility library for managing the libnvdimm subsystem
ii ndctl 61.2-0ubuntu1~18.04.1 amd64 Utility for managing the nvdimm subsystem

root@srl-mds1:~# ndctl create-namespace -e "namespace0.0" -m fsdax -f -vvv
enable_labels:945: region0: failed to initialize labels
namespace_reconfig:977: region0: no idle namespace seed
failed to reconfigure namespace: No such device
root@srl-mds1:~#

But if I add --no-autolabel it works

root@srl-mds1:~# ndctl create-namespace --no-autolabel --mode fsdax --map dev -e namespace0.0 -f -vvv
{
  "dev":"namespace0.0",
  "mode":"fsdax",
  "map":"dev",
  "size":"189.00 GiB (202.94 GB)",
  "uuid":"4c9523f5-8442-4356-9133-0e48c88c8d8f",
  "sector_size":512,
  "blockdev":"pmem0",
  "numa_node":0
}
root@srl-mds1:~# ndctl create-namespace --no-autolabel --mode fsdax --map dev -e namespace1.0 -f -vvv
{
  "dev":"namespace1.0",
  "mode":"fsdax",
  "map":"dev",
  "size":"189.00 GiB (202.94 GB)",
  "uuid":"2a16dd16-df10-4737-abb5-060266070d7e",
  "sector_size":512,
  "blockdev":"pmem1",
  "numa_node":1
}

Bionic LTS kernel still needs kernel fix.

Steve Langasek (vorlon) on 2020-07-02

Changed in ndctl (Ubuntu Disco):
status:	Incomplete → Won't Fix

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NVDIMM-N doesn't work properly on Dell EMC PowerEdge R840

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