** Tags added: verification-needed-bionic verification-needed-xenial

** Summary changed:

- Unable to modify/create-namespace over NVDIMM-N
+ [SRU] Unable to modify/create-namespace over NVDIMM-N

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https://bugs.launchpad.net/bugs/1811660

Title:
  [SRU] Unable to modify/create-namespace over NVDIMM-N

Status in The Dell-poweredge project:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]
  Users are unable to modify or create namespaces over NVDIMM-N

  [Test Case]

  Steps to Reproduce:
  1. Setup a Dell EMC 14G server R740xd server with NVDIMM-N, update BIOS & 
NVDIMM firmware to latest available to customers.
  2. Install and boot to Ubuntu 18.04
  3. Notice that no pmems are enumerated.
  4. Try #ndctl create-namespace -> Failure with device or resource busy.

  Actual results:
  No pmems are enumerated, cannot create namespaces.
  If pmems are already present, then cannot modify the namespaces.

  Expected results:
  namespace creation should be possible

  
  [Regression Potential] 

  The Regression Risk is low, Intel not impacted but Dell is.

  
  [Other Info]
  Additional Info:
  * Seen with upstream linux-4.20.2 also.

  * Upstream bug report -
  https://github.com/pmem/ndctl/issues/78

  * Upstream kernel patch:
  https://lists.01.org/pipermail/linux-nvdimm/2019-January/019435.html

  Request you to incorporate it in bionic and xenial kernels.

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