Created attachment 1787835 [details]
Boot console log

Rawhide compose does not boot and end with a kernel panic.
VFS: Cannot open root device "(null)" or unknown-block(1,0): error -6
Please append a correct "root=" boot option; here are the available partitions:
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

also we can see the following line during the boot. 
Initramfs unpacking failed: XZ-compressed data is corrupt

I get the console from the Fedora-Server-dvd-ppc64le-Rawhide-20210526.n.0.iso
boot Linux version 5.13.0-0.rc3.20210525gita050a6d2b7e8.26.fc35.ppc64le (mockbuild.fedoraproject.org) (gcc (GCC) 11.1.1 20210512 (Red Hat 11.1.1-2), GNU ld version 2.36.1-12.fc35) #1 SMP Tue May 25 20:23:38 UTC 2021
but the problem was already there before.
It is inttermittent and I can say it was not present in the compose of
Rawhide-20210506.n.0 after that it was sporadically present and very often these last days.

I detected this problem during qemu VM installation.
Sometime the boot is correct when I try it several times and it seems that
waiting some time before clicking the installation on the grub menu improve a little the number of success.