Red Hat Summit25.11. Rootfs image is not initramfs
If you get the following message on the console during booting the installer, the transfer of the installer initrd.img might have had errors:
[ ...] rootfs image is not initramfs
To resolve this issue, download initrd again or run the sha256sum with initrd.img and compare it with the checksum stored in the .treeinfo file on the installation medium, for example,
$ sha256sum dvd/images/pxeboot/initrd.img
fdb1a70321c06e25a1ed6bf3d8779371b768d5972078eb72b2c78c925067b5d8 dvd/images/pxeboot/initrd.img
To view the checksum in .treeinfo:
$ grep sha256 dvd/.treeinfo
images/efiboot.img = sha256:d357d5063b96226d643c41c9025529554a422acb43a4394e4ebcaa779cc7a917
images/install.img = sha256:8c0323572f7fc04e34dd81c97d008a2ddfc2cfc525aef8c31459e21bf3397514
images/pxeboot/initrd.img = sha256:fdb1a70321c06e25a1ed6bf3d8779371b768d5972078eb72b2c78c925067b5d8
images/pxeboot/vmlinuz = sha256:b9510ea4212220e85351cbb7f2ebc2b1b0804a6d40ccb93307c165e16d1095db
Despite having correct initrd.img, if you get the following kernel messages during booting the installer, often a boot parameter is missing or mis-spelled, and the installer could not load stage2, typically referred to by the inst.repo= parameter, providing the full installer initial ramdisk for its in-memory root file system:
[ ...] No file system could mount root, tried:
[ ...] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
[ ...] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0.el10_0.s390x #1
[ ...] ...
[ ...] Call Trace:
[ ...] ([<...>] show_trace+0x.../0x...)
[ ...] [<...>] show_stack+0x.../0x...
[ ...] [<...>] panic+0x.../0x...
[ ...] [<...>] mount_block_root+0x.../0x...
[ ...] [<...>] prepare_namespace+0x.../0x...
[ ...] [<...>] kernel_init_freeable+0x.../0x...
[ ...] [<...>] kernel_init+0x.../0x...
[ ...] [<...>] kernel_thread_starter+0x.../0x...
[ ...] [<...>] kernel_thread_starter+0x.../0x…To resolve this issue, check
-
if the installation source specified is correct on the kernel command line (
inst.repo=) or in the kickstart file - the network configuration is specified on the kernel command line (if the installation source is specified as network)
- the network installation source is accessible from another system
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