group.of.nepali.translators team mailing list archive

[Po-Hsu Lin <1903596@xxxxxxxxxxxxxxxxxx>]

$ git tag --contains 427d5838e99632e9218eae752009c873cade89ac
Ubuntu-5.10.0-12.13
Ubuntu-5.10.0-13.14
Ubuntu-5.10.0-14.15
Ubuntu-5.10.0-15.16
Ubuntu-5.11.0-11.12

In hirsute already. Closing this bug.

** Changed in: linux (Ubuntu Hirsute)
     Assignee: Po-Hsu Lin (cypressyew) => (unassigned)

** Changed in: linux (Ubuntu Hirsute)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1903596

Title:
  stack trace in kernel

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Focal:
  Fix Released
Status in linux source package in Groovy:
  Fix Released
Status in linux source package in Hirsute:
  Fix Released

Bug description:
  == SRU Justification ==
  Whenever a buggy NAPI driver returns more than its budget, it will
  trigger a stack trace warning with:
      WARN_ON_ONCE(work > weight);

  The warning message looks like this :
      WARNING: CPU: 2 PID: 0 at /build/linux-hwe-ymdo11/linux-hwe-4.15.0/net/core/dev.c:5672 net_rx_action+0x276/0x3b0

  This is not very useful for debugging purpose, since it does not tell
  you what's going on there.

  == Fix ==
  * 427d5838e996 ("net: napi: remove useless stack trace")

  This patch will emit a message giving the function name, and a
  descriptive message like:
      NAPI poll function ath10k_pci_napi_poll+0x0/0x120 [ath10k_pci] returned 0, exceeding its budget of 64.

  This patch is a clean-cherry for all the releases except Xenial.
  For Xenial it will need to be applied with -C1

  == Test ==
  Test kernels can be found here:
  https://people.canonical.com/~phlin/kernel/lp-1903596-napi-warnon/

  Please note that even though I tried to reproduce this on a XPS 13
  9360 mentioned in this bug report that shipped with Atheros QCA6174
  [168c:003e] wireless card, but I can't trigger this warning message.
  The bug opener is also unable to test this due to some other reasons.

  Howeve I did tried to trigger this warning forcibly by putting it
  outside the if statement with the test kernels in the following link
  to make sure it won't cause some other problem.

  https://people.canonical.com/~phlin/kernel/lp-1903596-napi-warnon
  /force-to-warn/

  == Where problems could occur ==
  For this bug itself, this patch does not really solve the problem
  but it will provide more debug information for developers in the
  future (and since this is just a warning message, it should be fine).
  We can expect to see more a detailed report against ath10k driver
  in the future on launchpad.


  == Original Bug Report ==
  This appears to be a problem in the ath10k module. I am not sure what it is exactly.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.15.0-122-generic 4.15.0-122.124~16.04.1
  ProcVersionSignature: Ubuntu 4.15.0-122.124~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-122-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.26
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Nov  9 13:35:54 2020
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  InstallationDate: Installed on 2020-11-09 (0 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  SourcePackage: linux-signed-hwe
  UpgradeStatus: No upgrade log present (probably fresh install)

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