Comment # 16 on bug 1181018 from Kurt Garloff

(In reply to Michal Suchanek from comment #14)
> How does it break the virtual floppy, exactly?
> 
> The floppy should either be there from the start and then blkid can see it
> or it is not there and then it can't.
> 
> That should not change with O_NONBLOCK.

It is there right from the start:

/usr/bin/qemu-system-x86_64 -machine accel=kvm -m 512,slots=3,maxmem=2048M -smp
1,maxcpus=4 -cpu host -name local-25241 -uuid
51c8ee33-2495-465e-8680-6568b6927a92 -smbios
type=1,uuid=51c8ee33-2495-465e-8680-6568b6927a92,serial=25241 -nographic
-nodefaults -machine q35,accel=kvm,usb=off,vmport=off,dump-guest-core=off -rtc
base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -device
virtio-scsi-pci,id=scsi,bus=pcie.0,addr=0x10 -drive
file=/tmp/ci-disk.25241.ZNIm/openSUSE-15.2-JeOS.x86_64-1.15.2.9-25241.qcow2,if=none,media=disk,id=drive-virtio-disk0
-device scsi-hd,drive=drive-virtio-disk0 -drive
file=/tmp/ci-disk.25241.ZNIm/seed-25241.img,format=raw,if=none,media=cdrom,id=cidata
-device scsi-cd,drive=cidata -drive
file=/tmp/ci-disk.25241.ZNIm/seed-25241.img2,format=raw,if=floppy,id=notcidata
-netdev bridge,br=br0,id=hostnet0 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:f3:62:99,bus=pcie.0,addr=0x3
-device virtio-serial-pci,id=virtio-serial0,bus=pcie.0,addr=0x6 -device
nec-usb-xhci,id=usb,bus=pcie.0,addr=0x5 -chardev
file,id=charserial0,path=/tmp/ci-disk.25241.ZNIm/serial0-25241 -device
isa-serial,chardev=charserial0,id=serial0 -device
qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x2
-chardev spicevmc,id=charchannel0,name=vdagent -device
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
-device usb-tablet,id=input0,bus=usb.0,port=1 -spice
port=5903,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on
-audiodev spice,id=sound0 -device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b
-device hda-duplex,audiodev=sound0,id=sound0-codec0,bus=sound0.0,cad=0 -device
virtio-balloon-pci,id=balloon0,bus=pcie.0,addr=0x8 -object
rng-random,id=objrng0,filename=/dev/random -device
virtio-rng-pci,rng=objrng0,id=rng0,bus=pcie.0,addr=0x9 -monitor
telnet:127.0.0.1:55903,server,nowait


Note the -drive
file=/tmp/ci-disk.25241.ZNIm/seed-25241.img2,format=raw,if=floppy,id=notcidata

This is with qemu (KVM) from Leap 15.2.
Happy to provide images and scripts of this helps with reproduction.