1. Please describe the problem:
At grub boot time, I get

KERNEL PANIC!
Please reboot your computer.
VFS: Unable to mount root fs on unknown-block(0,0)

2. What is the Version-Release number of the kernel:
6.16.7-200

3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :
The Fedora 42 6.14 kernel works.
The Fedora 41 6.15 kernel works (for Fedora 42).

I think that I first noticed the problem when I updated my Fedora 41 system
to a 6.16 kernel.
I think that kernel would not shutdown properly.
I decided that it was time to upgrade from 41 to 42.

During the upgrade process, the computer would not shutdown.
A force power-cycle resulted in the kernel panic at boot time.
Booting from the old kernels (mentioned above) worked.
I removed the faulty kernel, tried several times to reinstall it, with no luck.
I installed the Fedora 42 6.14 kernel and kept the old Fedora 41 6.15 kernel.
I think that the Fedora 41 6.16 kernel was bad too.

Twice since then, my automatic system updates have tried (and failed) again.
I just keep removing the kernel each time and use an old one.

4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:
Install this kernel and reboot.

5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:
I have not tried.

6. Are you running any modules that not shipped with directly Fedora's kernel?:
No.

7. Please attach the kernel logs. You can get the complete kernel log
   for a boot with ``journalctl --no-hostname -k > dmesg.txt``. If the
   issue occurred on a previous boot, use the journalctl ``-b`` flag.
There is no log.
It does not boot.