I have successfully created a kvm based reproducer.
1) get an image $ wget https://cdimage.ubuntu.com/ubuntu-server/daily-live/pending/noble-live-server-amd64.iso
2) Create bcache disk $ fallocate -l 20G image.img $ make-bcache -C image.img
3) Boot into iso with multipathed bcache disk $ kvm -m 2048 -boot d -cdrom ./noble-live-server-amd64.iso -device virtio-scsi-pci,id=scsi -drive file=image.img,if=none,id=sda,format=raw,file.locking=off -device scsi-hd,drive=sda,serial=0001 -drive if=none,id=sdb,file=image.img,format=raw,file.locking=off -device scsi-hd,drive=sdb,serial=0001
Select "Try or install Ubuntu" wait for the OS to load. Press F2 to escape to a shell to check multipathed devices.
You will see exactly what this bug describes - /dev/sd{a,b} is present with no multipathing.
Redo these steps without make-bcache on image.img and you will see a proper multipath /dev/mapper/mpatha present.
I have successfully created a kvm based reproducer.
1) get an image /cdimage. ubuntu. com/ubuntu- server/ daily-live/ pending/ noble-live- server- amd64.iso
$ wget https:/
2) Create bcache disk
$ fallocate -l 20G image.img
$ make-bcache -C image.img
3) Boot into iso with multipathed bcache disk live-server- amd64.iso -device virtio- scsi-pci, id=scsi -drive file=image. img,if= none,id= sda,format= raw,file. locking= off -device scsi-hd, drive=sda, serial= 0001 -drive if=none, id=sdb, file=image. img,format= raw,file. locking= off -device scsi-hd, drive=sdb, serial= 0001
$ kvm -m 2048 -boot d -cdrom ./noble-
Select "Try or install Ubuntu" wait for the OS to load. Press F2 to escape to a shell to check multipathed devices.
You will see exactly what this bug describes - /dev/sd{a,b} is present with no multipathing.
Redo these steps without make-bcache on image.img and you will see a proper multipath /dev/mapper/mpatha present.