[Qemu-devel] [Bug 551220] Re: qemu 0.12.3 stalls under load

[Anthony Liguori]

This has been fixed in 0.12.4.

** Changed in: qemu
       Status: New => Fix Released

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qemu 0.12.3 stalls under load
https://bugs.launchpad.net/bugs/551220
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Status in QEMU: Fix Released

Bug description:
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