Public bug reported:
[Impact]
* Minimal images built from livecd-rootfs after March 12th do not boot.
There are no broken images on cloud-images.ubuntu.com, but no further
images will be published until this is fixed. Cloud-specific minimal
images are unaffected, as they do the proper steps in their build hooks
to mitigate this problem.
[Test Plan]
* Build a minimal image from livecd-rootfs in the focal branch.
* Launch it through qemu to verify it boots: qemu-system-x86_64 -cpu host
-machine type=q35,accel=kvm -m 2048 -snapshot -netdev
id=net00,type=user,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=net00
-drive if=virtio,format=qcow2,file=focal-server-cloudimg-amd64.img -drive
if=virtio,format=raw,file=seed.img -nographic
* Verify cloud-specific minimal builds still operate as intended (single boot,
no double boot fallback)
[Where problems could occur]
* The changes are forcing a boot without initramfs for all minimal
images. This was the default behavior before the March 12th change.
[Bug Description]
Here is the kernel panic:
VFS: Cannot open root device "LABEL=cloudimg-rootfs" or unknown-block(0,0):
error -6
Please append a correct "root=" boot option; here are the available partitions:
fe00 2306048 vda
driver: virtio_blk
fe01 2192367 vda1 eba1d37a-4dc1-4c42-8cab-ed045e561faa
fe0e 4096 vda14 9bbe6566-13bd-412a-9a58-8d85918ebe0f
fe0f 108544 vda15 b4d6d9b6-0a70-41eb-9d71-5d64fc7e7d08
fe10 366 vdb
driver: virtio_blk
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-1034-kvm #35-Ubuntu
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1 04/01/2014
Call Trace:
0xffffffff92b471a8
0xffffffff92b23a3d
0xffffffff9332f5d4
0xffffffff9332f6b0
0xffffffff9332f7e7
0xffffffff9332f287
? 0xffffffff92b4a5e0
0xffffffff92b4a5e9
0xffffffff92c00215
Kernel Offset: 0x11400000 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(0,0) ]---
Kernel command line :
Linux version 5.4.0-1034-kvm (buildd@lgw01-amd64-033) (gcc version 9.3.0
(Ubuntu 9.3.0-17ubuntu1~20.04)) #35-Ubuntu SMP Wed Feb 24 14:09:38 UTC )
Command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-1034-kvm
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
The root should be set to a PARTUUID, not a label.
** Affects: livecd-rootfs (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1920043
Title:
Latest Focal Minimal disk images from livecd-rootfs do not boot
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