Very interestingly, when setting `crashkernel=128M` instead of the
default `crashkernel=384M-2G:64M,2G-:128M`, crashing the machine works
correctly and also leaves a crashdump in /var/crash. Unfortunately
setting the crashkernel parameter requires editing /etc/grub.d/10_linux
directly and can not be overridden by means of /etc/default/grub.

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https://bugs.launchpad.net/bugs/1235616

Title:
  linux-crashdump doesn't actually dump and reboot

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