group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Would it be possible for you to test the latest upstream stable 4.18?  It can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.18.19/

** Tags removed: kernel-key
** Tags added: kernel-da-key

** Changed in: linux (Ubuntu Bionic)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Bionic)
       Status: Confirmed => Triaged

** Also affects: linux (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Cosmic)
       Status: New => Triaged

** Changed in: linux (Ubuntu Cosmic)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Cosmic)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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

** Changed in: linux (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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https://bugs.launchpad.net/bugs/1798127

Title:
  CPU Soft Lockups when stress-ng stack stressor runs with M.2 NVMe as
  root FS

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Invalid
Status in linux source package in Bionic:
  Triaged
Status in linux source package in Cosmic:
  Triaged

Bug description:
  This was reported by a hardware partner.  The system set up is a
  server with 512GB RAM and an M.2 NVMe drive as the root
  filesystem/boot device.

  Per the customer, when running the certification Memory Stress test
  (utilizing several stress-ng stressors run in sequence) the system
  freezes with CPU Soft Lockup errors appearing on console whe the
  "stack" stressor is run.

  Tester has tried with 2.5” SATA (1TB), 2.5” NVMe (800GB), and M.2 NVMe
  (1.9TB).

  So far, this only seems to affect the 4.15 kernel.  The tester has
  tried using the 2.5" SATA SSD as the RootFS/Boot device and the tests
  pass on all attempts.  It is ONLY when using the M.2 NVMe as the root
  / boot device that the tests cause a lockup.  The tester is re-trying
  now with the 2.5" NVMe device to see if this only occurs with the M.2
  NVMe.

  The tester has tried this on the following while using the M.2 NVMe as the rootFS/Boot device:
  Test run #1 – 16.04.5 at kernel 4.15; Result: Failed stress-ng memory on stack stressor
  Test run #2 – 18.04.1 at kernel 4.15; Result: Failed stress-ng memory on stack stressor
  Test run #3 – 16.04.5 at kernel 4.4; Result: Passed stress-ng memory test

  The stress-ng command invoked at the time the soft lockups occur is
  this:

  'stress-ng -k --aggressive --verify --timeout 300 --stack 0'

  This can be reproduced by running the memory_stress_ng test script
  from the cert suite:

  sudo /usr/lib/plainbox-provider-certification-
  server/bin/memory_stress_ng

  It may be more easily reproducible running the stack stressor alone,
  or the whole memory stress script without dealing with Checkbox.

  UPDATE: The tester also confirms that the 2.5" NVMe drives also fail
  with the 4.15 kernel and pass with the 4.4 kernel.  The SSD works on
  all kernels.

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