[Bug 1741860] Re: Use the kernel default for crashkernel offset

[Andy Whitcroft]

Hello bugproxy, or anyone else affected,

Accepted makedumpfile into disco-proposed. The package will build now
and be available at
https://launchpad.net/ubuntu/+source/makedumpfile/1:1.6.5-1ubuntu1.1 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-disco to verification-done-disco. If it does not fix
the bug for you, please add a comment stating that, and change the tag
to verification-failed-disco. In either case, without details of your
testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: makedumpfile (Ubuntu Disco)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-disco

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https://bugs.launchpad.net/bugs/1741860

Title:
  Use the kernel default for crashkernel offset

Status in The Ubuntu-power-systems project:
  In Progress
Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Xenial:
  In Progress
Status in makedumpfile source package in Bionic:
  Fix Committed
Status in makedumpfile source package in Disco:
  Fix Committed
Status in makedumpfile source package in Eoan:
  Fix Released

Bug description:
  [Impact]

   * The value chosen for ppc64el of 128MB aligns with that of the
  kernel default. That may change some day, so it would be best to let
  the kernel decide what value it should use. If the value does change
  and the kernel is not allowed to choose a value, this may stop the
  kernel from booting on a production system.

  [Test Case]

   Run `cat /etc/default/grub.d/kdump-tools.cfg`

   * Expected result: there is no offset specified at the end of the
  line (.e.g, @128M).

   * Actual result: For Xenial, Bionic, Disco, and Eoan there are
  offsets specified.

  [Regression Potential]

   * Right now, the offset described in the kdump-tools.cfg aligns with
  that of what the kernel would select, so since they are the same we
  would expect no change in operation.

  
  Original bug description follows:
  -----------------------------------------

  == Comment: #0 - Hari Krishna Bathini <hbathini at in.ibm.com> - 2018-01-08 01:06:41 ==
  ---Problem Description---
  A default offset of 128MB is enforced for crashkernel by kdump-tools utility
  overriding the kernel default.

  While the kernel default offset for crashkernel is also 128MB, that may change
  and the right thing to do would be to let the kernel decide on the offset of
  crashkernel in the default scenario..

  Get rid of "@128M" in kdump-tools.cfg file

  Contact Information = hbathini at in.ibm.com

  ---uname output---
  na

  Machine Type = na

  ---Debugger---
  A debugger is not configured

  ---Steps to Reproduce---
   # cat /etc/default/grub.d/kdump-tools.cfg
  GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M at 128M"
  ---

  The offset is specified via kdump-tools where as the kernel may be the right place to
  set an offset by default..

  Userspace tool common name: kdump-tools

  The userspace tool has the following bit modes: 64-bit

  Userspace rpm: kdump-tools

  Userspace tool obtained from project website:  na

  *Additional Instructions for hbathini at in.ibm.com:
  -Attach ltrace and strace of userspace application.

  == Comment: #3 - MAMATHA INAMDAR <mainamdar at in.ibm.com> - 2018-01-08 03:05:05 ==
  This bug is opened to follow-up other bug based on the comment 19
  https://bugzilla.linux.ibm.com/show_bug.cgi?id=152905#c19 (Canonical Launchpad 	1676884 )

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