Package: qemu-system-x86 Version: 1:2.8+dfsg-6+deb9u1 When I try to start any kvm guest via virsh start <guest>, the guest crashes during startup. See log extract below. Downgrading to qemu-system-x86=1:2.8+dfsg-6 solves the problem.
Extract from /var/log/libvirt/qemu/guest.log : LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin QEMU_AUDIO_DRV=spice /usr/bin/qemu-system-x86_64 -name guest=a,debug-threads=on -S -object secret,id=masterKey0,for mat=raw,file=/var/lib/libvirt/qemu/domain-2-a/master-key.aes -machine pc-i440fx-2.8,accel=kvm,u sb=off,vmport=off,dump-guest-core=off -cpu IvyBridge,+ds,+acpi,+ss,+ht,+tm,+pbe,+dtes64,+monito r,+ds_cpl,+vmx,+est,+tm2,+xtpr,+pdcm,+pcid,+osxsave,+arat,+xsaveopt -bios /usr/share/OVMF/OVMF_ CODE.fd -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 2a8f74bb-7cbd-48e5 -933d-e739ea08bb7a -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/lib virt/qemu/domain-2-a/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=contro l -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -glo bal PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -boot strict=on -device nec-usb-xhci,id =usb,bus=pci.0,addr=0x6 -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x5 -device virtio-seri al-pci,id=virtio-serial0,bus=pci.0,addr=0x7 -drive file=/var/lib/libvirt/images/a.img,format=qc ow2,if=none,id=drive-scsi0-0-0-0,discard=unmap -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0, lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=1 -drive if=none,id=drive-ide0-0-0,reado nly=on -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -netdev tap,fd=28,id=ho stnet0,vhost=on,vhostfd=30 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:a6:99:0f ,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=seria l0 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-2-a/org.qem u.guest_agent.0,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchan nel0,id=channel0,name=org.qemu.guest_agent.0 -chardev spicevmc,id=charchannel1,name=vdagent -de vice virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat. spice.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -spice port=0,disable-ticketing,image-com pression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=671088 64,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,b us=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=c harredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2 -charde v spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0 ,port=3 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -object rng-random,id=objrng0 ,filename=/dev/urandom -device virtio-rng-pci,rng=objrng0,id=rng0,bus=pci.0,addr=0x9 -msg times tamp=on Domain id=2 is tainted: custom-argv char device redirected to /dev/pts/3 (label charserial0) warning: host doesn't support requested feature: CPUID.01H:EDX.ds [bit 21] warning: host doesn't support requested feature: CPUID.01H:EDX.acpi [bit 22] warning: host doesn't support requested feature: CPUID.01H:EDX.ht [bit 28] warning: host doesn't support requested feature: CPUID.01H:EDX.tm [bit 29] warning: host doesn't support requested feature: CPUID.01H:EDX.pbe [bit 31] warning: host doesn't support requested feature: CPUID.01H:ECX.dtes64 [bit 2] warning: host doesn't support requested feature: CPUID.01H:ECX.monitor [bit 3] warning: host doesn't support requested feature: CPUID.01H:ECX.ds-cpl [bit 4] warning: host doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5] warning: host doesn't support requested feature: CPUID.01H:ECX.est [bit 7] warning: host doesn't support requested feature: CPUID.01H:ECX.tm2 [bit 8] warning: host doesn't support requested feature: CPUID.01H:ECX.xtpr [bit 14] warning: host doesn't support requested feature: CPUID.01H:ECX.pdcm [bit 15] warning: host doesn't support requested feature: CPUID.01H:ECX.osxsave [bit 27] qemu-system-x86_64: /build/qemu-0Yb2kr/qemu-2.8+dfsg/hw/usb/hcd-xhci.c:2169: xhci_kick_epctx: A ssertion `!epctx->kick_active' failed. 2017-07-27 21:10:56.112+0000: shutting down, reason=crashed
