** Changed in: linux (Ubuntu)
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1786878

Title:
  [Regression] kernel crashdump fails on arm64

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  In Progress

Bug description:
  [Impact]
  With artful, crashdump worked on the Cavium CRBs, Cavium-based Gigabyte 
boards and the Qualcomm Amberwing board, but it no longer works with v4.15. 
While possibly not a regression, crashdump also does not currently work with 
the HiSilicon D05 board, but does with the proposed fixes.

  [Test Case]
  sudo apt install linux-crashdump
  sudo reboot (needed to add crashkernel= param)
  echo 1 | sudo tee /proc/sys/kernel/sysrq
  echo c | sudo tee /proc/sysrq-trigger

  [Fix]
  Fixes are currently staged in linux-next:
  09ffcb0d718a0 arm64: acpi: fix alignment fault in accessing ACPI
  20d12cf990618 efi/arm: map UEFI memory map even w/o runtime services enabled
  3ea86495aef2f efi/arm: preserve early mapping of UEFI memory map longer for 
BGRT
  5bcd44083a082 drivers: acpi: add dependency of EFI for arm64
  50d7ba36b916d arm64: export memblock_reserve()d regions via /proc/iomem

  [Regression Risk]
  Patches are all ARM specific. Tested on 4 ARM platforms - those listed above, 
as well as the HiSilicon D06. These patches are not sufficient to make kdump on 
the HiSilicon D06 work - but that's not a regression. However, no 
kdump-unrelated regressions were noticed on the D06.

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