Public bug reported:

[Impact]
Crash dump support doesn't work by default on any known arm64 platform. Users 
have to figure out working incantations for the crashkernel= parameter and the 
parameters passed to the crash-dump kernel themselves and manual edit 2 
different config files.

[Test Case]
Using either a Centriq 2400 or a Cavium ThunderX CRB (these platforms are known 
to support crashdump), and with a kernel >= 4.13 (xenial-ga did not support 
crashdump):

sudo apt install kdump-tools
(reboot, so crashkernel= is added to the kernel commandline)
echo c | sudo tee /proc/sysrq-trigger

Crash dump should occur, with artifacts collected in /var/crash.

If you want to verify that the dump is usable, install the corresponding
linux-image-<ver>-dbgsym package and run:

sudo crash /usr/lib/debug/boot/vmlinux-<ver>
/var/crash/<crash>/dump.<crash>

crash should successfully load, placing you at a "crash>" prompt. At that 
prompt, you can issue the 'bt' command to see a backtrace.
Note: you need crash from zesty (7.1.8-1ubuntu1) or later.

[Regression Risk]
TBD

** Affects: kexec-tools (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: makedumpfile (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: kexec-tools (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: makedumpfile (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: kexec-tools (Ubuntu Artful)
     Importance: Undecided
         Status: New

** Affects: makedumpfile (Ubuntu Artful)
     Importance: Undecided
         Status: New

** Affects: makedumpfile (Debian)
     Importance: Unknown
         Status: Unknown

** Also affects: kexec-tools (Ubuntu)
   Importance: Undecided
       Status: New

** Bug watch added: Debian Bug tracker #883899
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=883899

** Also affects: makedumpfile (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=883899
   Importance: Unknown
       Status: Unknown

** Also affects: kexec-tools (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: makedumpfile (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Also affects: kexec-tools (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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

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https://bugs.launchpad.net/bugs/1763532

Title:
  set reasonable default cmdlines for arm64

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