[Bug 1851547] Re: qemu 4 crashes with this parameter attached -usb -device usb-host, hostbus=1, hostaddr=7 \

[Marietto]

001:008 Compx 2.4G Receiver. Problem arise because I've detached one of
my USB disk and the numbering of the USB devices attached changed.
specially the compx 2.4g receiver changed from hostaddr 7 to 8 and when
this happens qemu 4 seems to work not as good as qemu 3.

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Title:
  qemu 4 crashes with this parameter attached -usb -device usb-
  host,hostbus=1,hostaddr=7 \

Status in QEMU:
  New

Bug description:
  Hello.

  qemu / kvm does not start anymore after upgrading ubuntu from 19.04 to
  19.10 and qemu from 3 to 4,as you can see below. what can I do ?

  root@ziomario-Z390-AORUS-PRO:/home/ziomario/Scrivania/OS-KVM# ./boot-
  OS-HSP2.sh

  ----> qemu-system-x86_64: /build/qemu-
  UryNDZ/qemu-4.0+dfsg/hw/usb/core.c:720: usb_ep_get: asserzione "dev !=
  NULL" non riuscita.

  ./boot-OS-HSP2.sh: riga 40: 26312 Annullato (core dump creato) qemu-
  system-x86_64 -enable-kvm -m 16000 -cpu
  Penryn,kvm=on,vendor=GenuineIntel,+invtsc,vmware-cpuid-
  freq=on,$MY_OPTIONS -machine pc-q35-2.9 -smp 4,cores=2 -vga none
  -device vfio-pci,host=01:00.0,bus=pcie.0,multifunction=on -device
  vfio-pci,host=01:00.1,bus=pcie.0 -device vfio-
  pci,host=01:00.2,bus=pcie.0 -device vfio-pci,host=01:00.3,bus=pcie.0
  -usb -device usb-host,hostbus=1,hostaddr=7 -drive
  if=pflash,format=raw,readonly,file=$OVMF/OVMF_CODE.fd -drive
  if=pflash,format=raw,file=$OVMF/OVMF_VARS-1024x768.fd -smbios type=2
  -device ich9-ahci,id=sata -drive
  id=Clover,if=none,snapshot=on,format=qcow2,file=./'Mo/CloverNG.qcow2'
  -device ide-hd,bus=sata.2,drive=Clover -device ide-
  hd,bus=sata.3,drive=InstallMedia -drive
  id=InstallMedia,if=none,file=BaseSystemHS.img,format=raw -drive
  id=BsdHDD,if=none,file=/dev/sdg,format=raw -device ide-
  hd,bus=sata.4,drive=BsdHDD -netdev
  tap,id=net0,ifname=tap0,script=no,downscript=no -device
  e1000-82545em,netdev=net0,id=net0,mac=52:54:00:c9:18:27 -monitor stdio

  It seems that this line is not good anymore (it worked with qemu 3.x)
  :

  -usb -device usb-host,hostbus=1,hostaddr=7 \

  when I removed it,it works. But I need that. With what can I change it
  ? You can reproduce that upgrading ubuntu 19.04 to 19.10 because in
  that way also qemu will be upgraded from 3 to 4. These are the
  packages that I'm using :

  root@ziomario-Z390-AORUS-PRO:/home/ziomario# qemu-system-x86_64 --version
  QEMU emulator version 4.0.0 (Debian 1:4.0+dfsg-0ubuntu9)

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