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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1920043 Title: Latest Focal Minimal disk images from livecd-rootfs do not boot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/1920043/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs