This is a kernel issue and we have seen this with upstream kernels and verified the fixes on upstream kernels. I expect bionic kernel 4.15 and above kernels to display this defect.
Although I have not tried applying only the kernel fix on bionic, the test kernel shared above shows that original defect is resolved, however another one has popped up. This indicates that a few more patches are required to get the complete namespace modification functionality working. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/dell-poweredge/+bug/1811660/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
