Ok, the cpu stays at 0% when it hangs, there is only one 100% cpu peak which happens when the vm starts ( I think this is quite normal). However I run following command, and I stop it right when it hangs: anakin trace2 # virsh start vm-jack; pid=`virsh qemu-monitor-command vm-jack --hmp info cpus | grep '\*' | awk '{print $5}' | cut -d\= -f2`; trace-cmd record -P $pid -p function if anyone is interested it produces a 1.6 GB file (the compressed version can be found here: http://papan.sk/share/trace2.dat.tar.gz (150 MB)) Tomas -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html