Hey folks, I am having the same problem. I recognize there was a patch a year ago (almost exactly one year ago) and I wonder it was included in later updates.
That said, Ubuntu has upgraded. Recently I upgrade my machine. Here are some key stats. DistroRelease: Ubuntu 20.04 Uname: Linux 5.4.0-14-generic x86_64 UpgradeStatus: Upgraded to focal on 2020-02-12 (22 days ago) ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18 RelatedPackageVersions: kvmtool N/A gir1.2-libvirt-glib-1.0 2.0.0-2 gir1.2-libvirt-sandbox-1.0 N/A libnss-libvirt N/A libvirt-bin N/A libvirt-clients 6.0.0-0ubuntu4 libvirt-daemon 6.0.0-0ubuntu4 libvirt-daemon-driver-lxc N/A libvirt-daemon-driver-qemu 6.0.0-0ubuntu4 libvirt-daemon-driver-storage-gluster N/A libvirt-daemon-driver-storage-rbd 6.0.0-0ubuntu4 libvirt-daemon-driver-storage-zfs N/A libvirt-daemon-driver-vbox N/A libvirt-daemon-driver-xen N/A libvirt-daemon-system 6.0.0-0ubuntu4 libvirt-daemon-system-systemd 6.0.0-0ubuntu4 libvirt-daemon-system-sysv N/A libvirt-dbus N/A libvirt-dev 6.0.0-0ubuntu4 libvirt-doc N/A libvirt-glib-1.0-0 2.0.0-2 libvirt-glib-1.0-dev N/A libvirt-ocaml N/A libvirt-ocaml-dev N/A libvirt-sandbox-1.0-5 N/A libvirt-sandbox-1.0-dev N/A libvirt-sanlock N/A libvirt-wireshark N/A libvirt0 6.0.0-0ubuntu4 libvirtodbc0 N/A libvirtualpg-dev N/A libvirtualpg0 N/A libvirtuoso5.5-cil N/A nbdkit-plugin-libvirt N/A nova-compute-libvirt N/A php-libvirt-php N/A python3-libvirt 6.0.0-0ubuntu3 ruby-fog-libvirt 0.6.0-1 ruby-libvirt 0.7.1-1 uvtool-libvirt N/A vagrant-libvirt 0.0.45-2 virt-manager 1:2.2.1-3ubuntu1 qemu 1:4.2-3ubuntu1 qemu-block-extra 1:4.2-3ubuntu1 qemu-efi N/A qemu-efi-aarch64 N/A qemu-efi-arm N/A qemu-guest-agent N/A qemu-kvm 1:4.2-3ubuntu1 qemu-slof N/A qemu-system N/A qemu-system-arm N/A qemu-system-common 1:4.2-3ubuntu1 qemu-system-data 1:4.2-3ubuntu1 qemu-system-gui 1:4.2-3ubuntu1 qemu-system-mips N/A qemu-system-misc N/A qemu-system-ppc N/A qemu-system-s390x N/A qemu-system-sparc N/A qemu-system-x86 1:4.2-3ubuntu1 qemu-system-x86-microvm N/A qemu-system-x86-xen N/A qemu-user N/A qemu-user-binfmt N/A qemu-user-static N/A qemu-utils 1:4.2-3ubuntu1 qemubuilder N/A -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1813165 Title: KVM internal error. Suberror: 1 emulation failure Status in QEMU: New Bug description: Hello Devs. Having problems getting VM to run with qemu 3.1.0. I should mention it's a nested configuration. 2019-01-24 13:46:08.648+0000: starting up libvirt version: 4.10.0, qemu version: 3.1.0, kernel: 4.14.94, hostname: one.... LC_ALL=C PATH=/bin:/sbin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin HOME=/root USER=root QEMU_AUDIO_DRV=none /usr/bin/kvm -name guest=one-266,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-one-266/master-key.aes -machine pc-i440fx-2.9,accel=kvm,usb=off,dump-guest-core=off -cpu Skylake-Client-IBRS,ss=on,hypervisor=on,tsc_adjust=on,clflushopt=on,ssbd=on,xsaves=on,pdpe1gb=on -m 1024 -realtime mlock=off -smp 2,sockets=2,cores=1,threads=1 -uuid b219b45d-a2f0-4128-a948-8673a7abf968 -no-user-config -nodefaults -chardev socket,id=charmonitor,fd=21,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=/var/lib/one//datastores/0/266/disk.0,format=qcow2,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,write-cache=on -drive file=/var/lib/one//datastores/0/266/disk.1,format=raw,if=none,id=drive-ide0-0-0,readonly=on -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=23,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=02:00:00:76:69:85,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -vnc 0.0.0.0:266 -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny -msg timestamp=on char device redirected to /dev/pts/1 (label charserial0) KVM internal error. Suberror: 1 emulation failure EAX=00000001 EBX=000f7c2c ECX=00000001 EDX=00000001 ESI=00006a26 EDI=3ffbdc48 EBP=000069e6 ESP=000a8000 EIP=000fd057 EFL=00010016 [----AP-] CPL=0 II=0 A20=1 SMM=1 HLT=0 ES =0010 00000000 ffffffff 00c09300 CS =0000 00000000 00000fff 00809b00 SS =0010 00000000 ffffffff 00c09300 DS =0010 00000000 ffffffff 00c09300 FS =0010 00000000 ffffffff 00c09300 GS =0010 00000000 ffffffff 00c09300 LDT=0000 00000000 0000ffff 00008200 TR =0000 00000000 0000ffff 00008b00 GDT= 10387cfe 0000fe6c IDT= 0010387c 00003810 CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000fffecffc DR7=000000000e1e0400 EFER=0000000000000000 Code=cb 66 ba 4d d0 0f 00 e9 c8 fe bc 00 80 0a 00 e8 31 3a ff ff <0f> aa fa fc 66 ba 66 d0 0f 00 e9 b1 fe f3 90 f0 0f ba 2d ac 3b 0f 00 00 72 f3 8b 25 a8 3b 2019-01-24T13:47:39.383366Z kvm: terminating on signal 15 from pid 2708 (/usr/sbin/libvirtd) Someone has an idea whats going wrong here? thanks and cheers t. 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