[Bug 1940984] [NEW] 5.11.0-1017 fails to boot on qemu builders

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I tried to do a routine upgrade and reflash of the Launchpad riscv64
builders, which pulled in linux-image-5.11.0-1017-generic
5.11.0-1017.18~20.04.1.  The resulting image failed to boot with the
following (complete) console output:

    Device 0: QEMU VirtIO Block Device
                Type: Hard Disk
                Capacity: 71680.0 MB = 70.0 GB (146800640 x 512)
    ... is now current device
    Scanning virtio 0:1...
    Found /boot/extlinux/extlinux.conf
    Retrieving file: /boot/extlinux/extlinux.conf
    1391 bytes read in 1 ms (1.3 MiB/s)
    U-Boot menu
    1:      Ubuntu 20.04.3 LTS 5.11.0-1017-generic
    2:      Ubuntu 20.04.3 LTS 5.11.0-1017-generic (rescue target)
    3:      Ubuntu 20.04.3 LTS 5.8.0-29-generic
    4:      Ubuntu 20.04.3 LTS 5.8.0-29-generic (rescue target)
    Enter choice: 1:        Ubuntu 20.04.3 LTS 5.11.0-1017-generic
    Retrieving file: /boot/initrd.img-5.11.0-1017-generic
    189611112 bytes read in 509 ms (355.3 MiB/s)
    Retrieving file: /boot/vmlinuz-5.11.0-1017-generic
    25258496 bytes read in 70 ms (344.1 MiB/s)
    append: root=UUID=b797e480-278b-4efc-ae1a-bb1634c8cbcf rw noquiet root=/dev/vda1
    Unhandled exception: Load access fault
    EPC: 00000000fffb642c RA: 00000000fff73bc4 TVAL: 0000000000000000
    EPC: 000000008024a42c RA: 0000000080207bc4 reloc adjusted
    
    ### ERROR ### Please RESET the board ###

For the time being I've set `U_BOOT_DEFAULT="l1"` in
`/etc/default/u-boot` to force it back to the 5.8 kernel, although
that's obviously not very robust.  Let me know if there's anything else
useful I can provide.  The full image is kind of massive (70G, though
sparse so with only 13G of actual data), so I hope you can reproduce it
with something more stripped-down.

I've attached the libvirt domain definition.

** Affects: u-boot-menu (Ubuntu)
     Importance: Undecided
         Status: New

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5.11.0-1017 fails to boot on qemu builders
https://bugs.launchpad.net/bugs/1940984
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