s390x: can't boot after bootc upgrade/switch

[henrywang]

boot install to-existing root and reboot works, but reboot failed after bootc upgrade or switch.

[    2.103382] ostree-prepare-root[722]: ostree-prepare-root: Couldn't find specified OSTree root '/sysroot//ostree/boot.1/default/dac6963aa541c7008638217c368ff03f691e2b1f62fb092a9d3877b8d441ebcd/0': No such file or directory 

TF log: https://artifacts.osci.redhat.com/testing-farm/3dabdf9f-a262-424d-bb4c-05032371c998/

[cgwalters]

Do you know offhand what the partition table layout is in this one?

[henrywang]

It might be related with 4G disk size? Looks growfs does not work in this case.

    NAME   FSTYPE  FSVER            LABEL      UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
    loop0  erofs
    zram0                                                                                          [SWAP]
    vda
    ├─vda1 xfs                      boot       b83cf712-37fa-4cc2-ae8b-1d009e974ec4  804.8M    16% /boot
    └─vda2 xfs                                 bdf2993f-7d37-449f-9b29-13830a9164c4      4G    55% /var
                                                                                                   /sysroot/ostree/deploy/default/var
                                                                                                   /etc
                                                                                                   /sysroot
    vdb    iso9660 Joliet Extension cidata     2025-03-25-22-36-19-00
    vdc    swap    1                SWAP-xvdb1 30b20d38-53c4-43d4-96a3-e8402ffc9e95

[henrywang]

Duplicated with https://github.com/bootc-dev/bootc/issues/824