[Bug 1800566] Re: Make reset_devices parameter default for kdump

[Andy Whitcroft]

Hello Guilherme, or anyone else affected,

Accepted makedumpfile into xenial-proposed. The package will build now
and be available at
https://launchpad.net/ubuntu/+source/makedumpfile/1:1.6.3-2~16.04.2 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-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. 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 Xenial)
       Status: In Progress => Fix Committed

** Tags added: verification-needed-xenial

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https://bugs.launchpad.net/bugs/1800566

Title:
  Make reset_devices parameter default for kdump

Status in makedumpfile package in Ubuntu:
  Fix Released
Status in makedumpfile source package in Trusty:
  Won't Fix
Status in makedumpfile source package in Xenial:
  Fix Committed
Status in makedumpfile source package in Bionic:
  Fix Committed
Status in makedumpfile source package in Cosmic:
  Won't Fix
Status in makedumpfile source package in Disco:
  Won't Fix
Status in makedumpfile source package in Eoan:
  Fix Committed
Status in makedumpfile source package in Focal:
  Fix Released

Bug description:
  [Impact]

  * Kdump does not configure by default the crash kernel to perform a
  device reset by default, by passing the "reset_devices" parameter.

  * Kernel has the "reset_devices" parameter that drivers can opt-in,
  and perform special activity in case this parameter is parsed from
  command-line. For example, in kdump kernels it hints the drivers that
  they are booting from a non-healthy condition and needs to issue some
  form of reset to the adapter, like clearing DMA mapping in their
  firmware for example. Users currently (kernel v5.5-rc2) are: aacraid,
  hpsa, ipr, megaraid_sas, mpt3sas, smartpqi, xenbus.

  This should be enabled by default in the kdump config file to be added
  in the kdump kernel command-line for all versions.

  [Test Case]

  1) Deploy a Bionic VM e.g. with uvt-kvm
  2) Install the kdump-tools package
  3) Run `kdump-config test`and check for the 'reset_devices' parameter:

  $ kdump-config test
  ...
  kexec command to be used:
    /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-4.15.0-45-generic root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0 nr_cpus=1 systemd.unit=kdump-tools.service irqpoll nousb ata_piix.prefer_ms_hyperv=0" /var/lib/kdump/vmlinuz

  
  [Regression Potential]

  The regression potential is low, since it doesn't need any changes in
  makedumpfile code and we're only adding a parameter on the crash
  kernel command-line. The risks are related with bad behavior with the
  kernel when using "reset_devices", like if the driver has bugs in this
  path. It's considered safer to have the option (and this way prevent
  problems for booting a unhealthy kernel with potential stuck DMAs in
  the devices) than not having it.

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