1. Please describe the problem:

Since Fedora-Rawhide-20260409.n.0 , where we went from kernel-7.0.0-0.rc7.260408g3036cd0d3328.56.fc45 to kernel-7.0.0-0.rc7.55.fc45 , all openQA USB boot tests fail on Rawhide. Boot fails in dracut, claiming that /dev/root does not exist. openQA emulates USB boot via qemu, this is the full qemu command:

/usr/bin/qemu-system-x86_64 -device virtio-vga,edid=on,xres=1024,yres=768 -only-migratable -chardev ringbuf,id=serial0,logfile=serial0,logappend=on -serial chardev:serial0 -audiodev none,id=snd0 -device intel-hda -device hda-output,audiodev=snd0 -global isa-fdc.fdtypeA=none -m 4096 -machine q35,smm=on -cpu host -netdev user,id=qanet0,net=172.16.2.0/24 -device virtio-net,netdev=qanet0,mac=52:54:00:12:34:56 -object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 -device qemu-xhci -device usb-tablet -smp 2 -enable-kvm -no-shutdown -vnc :113,share=force-shared -device virtio-serial -chardev pipe,id=virtio_console,path=virtio_console,logfile=virtio_console.log,logappend=on -device virtconsole,chardev=virtio_console,name=org.openqa.console.virtio_console -chardev pipe,id=virtio_console_user,path=virtio_console_user,logfile=virtio_console_user.log,logappend=on -device virtconsole,chardev=virtio_console_user,name=org.openqa.console.virtio_console_user -chardev socket,path=qmp_socket,server=on,wait=off,id=qmp_socket,logfile=qmp_socket.log,logappend=on -qmp chardev:qmp_socket -S -global driver=cfi.pflash01,property=secure,value=on -device virtio-scsi-pci,id=scsi0 -device qemu-xhci,id=xhci0 -blockdev driver=file,node-name=hd0-file,filename=/var/lib/openqa/pool/23/raid/hd0,cache.no-flush=on -blockdev driver=qcow2,node-name=hd0,file=hd0-file,cache.no-flush=on,discard=unmap -device virtio-blk,id=hd0-device,drive=hd0,serial=hd0 -blockdev driver=file,node-name=usbstick-overlay0-file,filename=/var/lib/openqa/pool/23/raid/usbstick-overlay0,cache.no-flush=on -blockdev driver=qcow2,node-name=usbstick-overlay0,file=usbstick-overlay0-file,cache.no-flush=on,discard=unmap -device usb-storage,id=usbstick-device,drive=usbstick-overlay0,bootindex=0 -drive id=pflash-code-overlay0,if=pflash,file=/var/lib/openqa/pool/23/raid/pflash-code-overlay0,unit=0,readonly=on -drive id=pflash-vars-overlay0,if=pflash,file=/var/lib/openqa/pool/23/raid/pflash-vars-overlay0,unit=1

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

kernel-7.0.0-0.rc7.55.fc45

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 :

Yes, see above. Good: kernel-7.0.0-0.rc7.260408g3036cd0d3328.56.fc45 . Bad: kernel-7.0.0-0.rc7.55.fc45

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

openQA reproduces it multiple times a day. I haven't had time to try locally yet.

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``:

Yes.

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.

Will see what I can get out of the dracut environment tomorrow, wanted to file this before I forgot.