** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
** Description changed:
[Impact]
The crashdump kernel fails to boot on HiSilicon D06, and likely other SMMUv3
ARM systems.
[Test Case]
sudo apt install linux-crashdump
Adjust crashkernel= parameter in /etc/default/grub.d/kdump-tools.cfg as
appropriate (for D06, crashkernel=512M)
+ Add "arm_smmu_v3.disable_bypass=1" to the kernel command line
sudo reboot (needed to add crashkernel= param)
echo 1 | sudo tee /proc/sys/kernel/sysrq
echo c | sudo tee /proc/sysrq-trigger
+
+ (Note to self - the following is needed on our systems w/ Mellanox adapters:
+ ubuntu@d06-3:~$ grep blacklist /etc/default/kdump-tools
+ KDUMP_CMDLINE_APPEND="nr_cpus=1 systemd.unit=kdump-tools-dump.service
module_blacklist=mlx5_core")
[Fix]
3f54c447df34f iommu/arm-smmu-v3: Don't disable SMMU in kdump kernel
[Regression Risk]
Restricted to SMMUv3 arm64-based systems.
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https://bugs.launchpad.net/bugs/1828868
Title:
crashdump fails on HiSilicon D06
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