Description of problem:
I've been running a KVM/SPICE Windows XP guest since Fedora 12 or so -- not
using libvirt, just a script that calls qemu-kvm directly.  There have been
a couple of bumps in the road (SPICE protocol change and qemu syntax change),
but nothing I haven't been able to figure out ... until now.

With the recent Rawhide update, I can't run any SPICE guest.  qemu-kvm
crashes hard, apparently when the guest tries to load the QXL driver.

Version-Release number of selected component (if applicable):
qemu-kvm-0.14.0-0.1.201102107aa8c46.fc15.x86_64

How reproducible:
100%

Steps to Reproduce:
1.  Attempt to run KVM guest that uses spice (exact command below).
  
Actual results:
qemu-kvm: /builddir/build/BUILD/qemu-kvm-0.14.0/qemu-kvm.c:1724: kvm_mutex_unlock: Assertion `!cpu_single_env' failed.

Expected results:
No crash.  Should work.

Additional info:
Here is the script that I use to start my guest:

#!/bin/bash

/usr/bin/sudo /usr/sbin/tunctl -p -t xpspice0 -u pilcher -g pilcher
/usr/bin/sudo /sbin/ifup xpspice0

/usr/bin/sudo /bin/chown pilcher:pilcher /dev/root_vg/xp-spice_vm_lv

/home/pilcher/bin/slow-spice.sh --host localhost --port 5930 &

/usr/bin/qemu-kvm -M pc -m 512 -smp 1 -name xp-spice -localtime \
    -monitor unix:/tmp/qemu-monitor-xp-spice,server,nowait \
    -usb -usbdevice tablet -soundhw ac97 -serial none \
    -parallel none -uuid 6db12eb3-2473-4ffb-8079-02ff40d52cd0 \
    -vga qxl -spice port=5930,disable-ticketing \
    -drive file=/dev/root_vg/xp-spice_vm_lv,if=virtio,index=0,boot=on,cache=none \
    -net nic,model=virtio,macaddr=54:52:00:5f:bb:7f,vlan=0,name=nic.0 \
    -net tap,name=tap.0,ifname=xpspice0,vlan=0,script=no,downscript=no

/usr/sbin/tunctl -d xpspice0

Here is slow-spice.sh:

#!/bin/bash
/bin/sleep 1
/usr/bin/spicec $@