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[Launchpad Bug Tracker <1800566@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package makedumpfile - 1:1.6.6-2ubuntu2

---------------
makedumpfile (1:1.6.6-2ubuntu2) eoan; urgency=medium

  [ Thadeu Lima de Souza Cascardo ]
  * Fixes for DLPAR cpu add operation (LP: #1828596)
    - d/kdump-config.in: Add a reload command.
    - d/kdump-config.in: implement try-reload.
    - d/50-kdump-tools.rules: Use kdump-config reload after cpu or memory hotplug
    - d/50-kdump-tools.rules: use try-reload instead.
  * d/rules: Use reset_devices as a cmdline parameter. (LP: #1800566)

  [ Guilherme G. Piccoli ]
  * d/kdump-tools-dump.service: Add a systemd-resolved service dependency
    in order to make kdump-tool able to resolve DNS when in kdump boot.
    (LP: #1856323)
  * d/p/0003-Increase-SECTION_MAP_LAST_BIT-to-4.patch: x86_64: Fix an error due
    to makedumpfile being out-of-sync with recent kernels. (LP: #1857616)

 -- gpiccoli@xxxxxxxxxxxxx (Guilherme G. Piccoli)  Fri, 03 Jan 2020
16:10:19 -0300

** Changed in: makedumpfile (Ubuntu Eoan)
       Status: Fix Committed => Fix Released

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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 Released
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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