qemu 0.12.3 stalls under load

[Roberto Taglioretti]

Under load quemu 0.12.3 stalls. The load is created with stress software http://weather.ou.edu/~apw/projects/stress/
with this command line:
stress --cpu 32 --io 32 --vm 31 --vm-bytes 64M --hdd 32 --timeout 28800s -v
the guest random stalling, my tests are on 45 qemu virtual machine on
many kind of hardware hosts.
I have two kind of qemu vm with kvm support, theese are the command
lines. First kind:
qemu-system-x86_64 \
-enable-kvm -cpu qemu32 \
-net nic,model=e1000,macaddr=02:00:00:00:00:01 \
-net tap,ifname=tap0,script=no,downscript=no \
-m 2048 \
-hda /usr/local/data/virtual/vm000/hda.img \
-hdb /usr/local/data/virtual/vm000/hdb.img \
 -vnc :0 \
-monitor unix:/usr/local/data/virtual/vm000/vm000.sock,server,nowait \
-pidfile /usr/local/data/virtual/vm000/vm000.pid \
-no-reboot
Second kind:
qemu-system-x86_64 \
-enable-kvm -cpu core2duo \
-net nic,model=e1000,macaddr=02:00:00:00:00:02 \
-net tap,ifname=tap1,script=no,downscript=no \
-m 5120 \
-hda /usr/local/data/virtual/vm001/hda.img \
-hdb /usr/local/data/virtual/vm001/hdb.img \
 -vnc :1 \
-monitor unix:/usr/local/data/virtual/vm001/vm001.sock,server,nowait \
-pidfile /usr/local/data/virtual/vm001/vm001.pid \
-no-reboot

When qemu i stalled keybord, nic and vnc do not answer but
the qemu process remains active. No logs are generated.
Hosts and guests have Vanilla kernel.

Attached:
cfghost = .config for the hosts
cfgg32 = .config for the guest of type one
cfgg64 = .config for the guest of type two

[Roberto Taglioretti (taglioretti)]

If I remove the option -enable-kvm the system run without problems.

[Dustin Kirkland  (kirkland)]

Roberto-

Are you running with acceleration at that point?

[Anthony Liguori (anthony-codemonkey)]

This has been fixed in 0.12.4.