Qemu crashes when I start a second VM from command line

[biju Talukdar]

I am using Qemu on 64 bit x86 platform, operating system ubuntu 14.04. I cloned the latest version of qemu from github and installed on my system.

I booted the 1st VM with the instruction:

sudo qemu-system-x86_64 -m 1024 -smp 4 -cpu host -hda /var/lib/libvirt/images/vm1p4.img -boot c -enable-kvm -no-reboot -net none -chardev socket,id=char1,path=/usr/local/var/run/openvswitch/vhost-user1 -netdev type=vhost-user,id=mynet1,chardev=char1,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:01,netdev=mynet1 -object memory-backend-file,id=mem,size=1024M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc

It is was launched successfully.
Then I lanched the second VM with the instruction:

sudo qemu-system-x86_64 -m 1024 -smp 4 -cpu host -hda /var/lib/libvirt/images/vm1p4-2.img -boot c -enable-kvm -no-reboot -net none -chardev socket,id=char2,path=/usr/local/var/run/openvswitch/vhost-user2 -netdev type=vhost-user,id=mynet2,chardev=char2,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:02,netdev=mynet2 -object memory-backend-file,id=mem,size=1024M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc

Qemu crashed right away. Plea see the log below.

sudo qemu-system-x86_64 -m 1024 -smp 4 -cpu host -hda /var/lib/libvirt/images/vm1p4-2.img -boot c -enable-kvm -no-reboot -net none -chardev socket,id=char2,path=/usr/local/var/run/openvswitch/vhost-user2 -netdev type=vhost-user,id=mynet2,chardev=char2,vhostforce -device virtio-net-pci,mac=00:00:00:00:00:02,netdev=mynet2 -object memory-backend-file,id=mem,size=1024M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc
KVM internal error. Suberror: 1
emulation failure
EAX=000cc765 EBX=00000007 ECX=000cc6ac EDX=0000df00
ESI=1ff00000 EDI=0000d5d7 EBP=ffffffff ESP=0000f9ce
EIP=d5d70000 EFL=00010012 [----A--] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =df00 000df000 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =df00 000df000 ffffffff 00809300
DS =df00 000df000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =0000 00000000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT= 00000000 00000000
IDT= 00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

[Michael liu (ztehypervisor)]

when the second VM crashed,how about first VM? It seems like that you use vhost-user as your backend type.Does the backend of the 1st VM and 2nd VM connect the same switch ?

[Thomas Huth (th-huth)]

Can you still reproduce the problem with the latest upstream version of QEMU and the latest version of the upstream Linux kernel?

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]