** 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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