[Bug 1814420] Re: drive-backup with iscsi, it will failed "Could not create image: Invalid argument"

[John Snow <1814420@bugs.launchpad.net>]

Hi, qemu version 3.1 is a bit old in terms of upstream support. Can you
confirm that this is still an issue on 4.2 ?

** Changed in: qemu
       Status: New => Incomplete

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Title:
  drive-backup with iscsi, it will failed "Could not create image:
  Invalid argument"

Status in QEMU:
  Incomplete

Bug description:
  I use iscsi protocol to drive-backup:

  ---iscsi target---
  yum -y install targetcli python-rtslib
  systemctl start target
  systemctl enable target
  targetcli /iscsi create iqn.2019-01.com.iaas
  targetcli /iscsi/iqn.2019-01.com.iaas/tpg1 set attribute authentication=0 demo_mode_write_protect=0 generate_node_acls=1
  targetcli /iscsi/iqn.2019-01.com.iaas/tpg1/portals create 192.168.1.1 3260
  targetcli /backstores/fileio create file1 /opt/file1 2G
  targetcli /iscsi/iqn.2019-01.com.iaas/tpg1/luns create /backstores/fileio/file1
  -------------------

  Now, '{ "execute" : "drive-backup" , "arguments" : { "device" :
  "drive-virtio-disk0" , "sync" : "top" , "target" :
  "iscsi://192.168.1.1:3260/iqn.2019-01.com.iaas/0" } }'

  It may failed:
  {"id":"libvirt-1785","error":{"class":"GenericError","desc":"Could not
  create image: Invalid argument"}}

  But, This abnormal will be appear at the first time. Because when I
  retry again, It works very well.

  Then, I re-start the vm, It still be failed 'Could not create image:
  Invalid argument' on the first try, and the second try it will work
  very well.

  ---
  Host: centos 7.5
  qemu version: 2.12 and 3.1.0
  qemu command line: qemu-system-x86_64 -name guest=test,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-190-test./master-key.aes -machine pc-i440fx-3.1,accel=kvm,usb=off,dump-guest-core=off,mem-merge=off -m 1024 -mem-prealloc -mem-path /dev/hugepages1G/libvirt/qemu/190-test -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 1c8611c2-a18a-4b1c-b40b-9d82040eafa4 -smbios type=1,manufacturer=IaaS -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=31,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot menu=on,strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x3 -drive file=/opt/vol/sas/fb0c7c37-13e7-41fe-b3f8-f0fbaaeec7ce,format=qcow2,if=none,id=drive-virtio-disk0,cache=writeback -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on -drive file=/opt/vol/sas/bde66671-536d-49cd-8b46-a4f1ea7be513,format=qcow2,if=none,id=drive-virtio-disk1,cache=writeback -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk1,id=virtio-disk1,write-cache=on -netdev tap,fd=33,id=hostnet0,vhost=on,vhostfd=34 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:85:45:3e:d4:3a,bus=pci.0,addr=0x6 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev socket,id=charchannel0,fd=35,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:0,password -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4 -msg timestamp=on

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