Comment 4 for bug 1635339

I'm running into this issue as well:
Arch Linux
Qemu 2.8.0
spice guest tools: 0.132
QXL driver version (as reported by Windows Device Manager): 10.0.0.15000

Everything else works great. It would save me a lot of rebooting if this could get fixed.
If there is anything I can do or try, I'll be glad to help.

Relevant log of VM boot and crash on selecting suspend action in virt-manager:

2017-04-06 16:59:24.681+0000: starting up libvirt version: 3.1.0, qemu version: 2.8.0, hostname: arch-vaio.localdomain
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=spice /usr/bin/qemu-system-x86_64 -name guest=Windows,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-9-Windows/master-key.aes -machine pc-i440fx-2.7,accel=kvm,usb=off,vmport=off,dump-guest-core=off -cpu core2duo,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff -m 2048 -realtime mlock=off -smp 2,sockets=1,cores=2,threads=1 -uuid f14684d3-5f81-4743-8512-e516d85ca2c9 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-9-Windows/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=localtime,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x6.0x7 -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x6 -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x6.0x1 -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x6.0x2 -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 -drive file=/mnt/media/Qemu/windows10.qcow2,format=qcow2,if=none,id=drive-virtio-disk0 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x7,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/usr/share/spice-guest-tools/spice-guest-tools.iso,format=raw,if=none,id=drive-ide0-0-1,readonly=on -device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev user,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:44:08:31,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -chardev spicevmc,id=charchannel0,name=vdagent -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0 -device usb-tablet,id=input2,bus=usb.0,port=3 -spice port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pci.0,addr=0x2 -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -chardev spicevmc,id=charredir0,name=usbredir -device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=1 -chardev spicevmc,id=charredir1,name=usbredir -device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x8 -msg timestamp=on
char device redirected to /dev/pts/6 (label charserial0)
main_channel_link: add main channel client
red_dispatcher_set_cursor_peer:
inputs_connect: inputs channel client create
main_channel_handle_parsed: agent start
ehci warning: guest updated active QH
qemu-system-x86_64: /build/qemu/src/qemu-2.8.0/hw/display/qxl.c:2173: qxl_pre_save: Assertion `d->last_release_offset < d->vga.vram_size' failed.
2017-04-06 17:00:32.819+0000: shutting down, reason=crashed