kernel trace of 18.04.5 daily image (20200806.1) on Hisilicon D05 arm64 arch

[Taihsiang Ho]

image: 18.04.5 daily image (20200806.1) bionic-live-server-arm64.iso
kernel: 4.15.0-112-generic #113-Ubuntu
platform: Hisilicon D05 arm64 arch

[Reproducing Steps]
1. setup pxe boot by following https://discourse.ubuntu.com/t/netbooting-the-live-server-installer/14510
2. pxe boot the machine with the image

[Expected Result]
Boot to subiquity

[Actual Result]
Kernel trace happened during booting process. Reproducing rate: 2 out of 2.

[ 6.643543] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.15.0-112-generic #113-Ubuntu
[ 6.651271] Hardware name: Hisilicon D05/BC11SPCD, BIOS 1.50 06/01/2018
[ 6.657871] Call trace:
[ 6.660308] dump_backtrace+0x0/0x198
[ 6.663957] show_stack+0x24/0x30
[ 6.667261] dump_stack+0x98/0xbc
[ 6.670563] panic+0x128/0x2a4
[ 6.673606] mount_block_root+0x210/0x2e8
[ 6.677603] mount_root+0x7c/0x8c
[ 6.680904] prepare_namespace+0x144/0x1dc
[ 6.684987] kernel_init_freeable+0x218/0x23c
[ 6.689331] kernel_init+0x18/0x110
[ 6.692806] ret_from_fork+0x10/0x18
[ 6.696428] SMP: stopping secondary CPUs
[ 6.700345] Kernel Offset: disabled
[ 6.703821] CPU features: 0x00002008
[ 6.707382] Memory Limit: none
[ 6.710438] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1890867

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Taihsiang Ho (tai271828)]

The issue happened at boot stage. apport-collect can't be applied.

[Ike Panhc (ikepanhc)]

From kernel oops, there is no root fs found. Possible root cause is bug 1890797, which needed kernel module udebs are not packed into legacy ISO. But this bug is filed against daily-live ISO, better to check if we have same issue on daily-live ISOs too.

[Ike Panhc (ikepanhc)]

Ah, Please skip comment #2. This is different issue. Bug 1890797 only affects when you install with HWE kernels. This bug reports on 4.15 kernel.

[Taihsiang Ho (tai271828)]

Similar to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1890884/comments/6 let me re-visit my pxe configuration and set the status as "incomplete".

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for subiquity (Ubuntu) because there has been no activity for 60 days.]