add launchpad bug reports without comments

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+Regression: QEMU 4.0 hangs the host (*bisect included*)
+
+The commit b2fc91db84470a78f8e93f5b5f913c17188792c8 seemingly introduced a regression on my system.
+
+When I start QEMU, the guest and the host hang (I need a hard reset to get back to a working system), before anything shows on the guest.
+
+I use QEMU with GPU passthrough (which worked perfectly until the commit above). This is the command I use:
+
+```
+/path/to/qemu-system-x86_64
+  -drive if=pflash,format=raw,readonly,file=/path/to/OVMF_CODE.fd
+  -drive if=pflash,format=raw,file=/tmp/OVMF_VARS.fd.tmp
+  -enable-kvm
+  -machine q35,accel=kvm,mem-merge=off
+  -cpu host,kvm=off,hv_vendor_id=vgaptrocks,hv_relaxed,hv_spinlocks=0x1fff,hv_vapic,hv_time
+  -smp 4,cores=4,sockets=1,threads=1
+  -m 10240
+  -vga none
+  -rtc base=localtime
+  -serial none
+  -parallel none
+  -usb
+  -device usb-tablet
+  -device vfio-pci,host=01:00.0,multifunction=on
+  -device vfio-pci,host=01:00.1
+  -device usb-host,vendorid=<vid>,productid=<pid>
+  -device usb-host,vendorid=<vid>,productid=<pid>
+  -device usb-host,vendorid=<vid>,productid=<pid>
+  -device usb-host,vendorid=<vid>,productid=<pid>
+  -device usb-host,vendorid=<vid>,productid=<pid>
+  -device usb-host,vendorid=<vid>,productid=<pid>
+  -device virtio-scsi-pci,id=scsi
+  -drive file=/path/to/guest.img,id=hdd1,format=qcow2,if=none,cache=writeback
+  -device scsi-hd,drive=hdd1
+  -net nic,model=virtio
+  -net user,smb=/path/to/shared
+```
+
+If I run QEMU without GPU passthrough, it runs fine.
+
+Some details about my system:
+
+- O/S: Mint 19.1 x86-64 (it's based on Ubuntu 18.04)
+- Kernel: 4.15
+- `configure` options: `--target-list=x86_64-softmmu --enable-gtk --enable-spice --audio-drv-list=pa`
+- EDK2 version: 1a734ed85fda71630c795832e6d24ea560caf739 (20/Apr/2019)
+- CPU: i7-6700k
+- Motherboard: ASRock Z170 Gaming-ITX/ac
+- VGA: Gigabyte GTX 960 Mini-ITX
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