Why my QEMU VM won't start?

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romzhke
Posts: 6
Joined: Wed Oct 07, 2020 7:38 am

Why my QEMU VM won't start?

Post by romzhke » Tue Dec 15, 2020 10:37 am

Hello colleagues.

Would you please say, How to troubleshoot KVM issues? I have some linux VMs, And I had 'em running for weeks. But today one of them just won't start anymore. I cannot figure out with is wrong.
When i click "Start" in web console, i see green notification, that the VM has started. But it is not. If follow syslog during VM start i see the following:

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root@eve-ng:/var/log# brctl show  
bridge name	bridge id		STP enabled	interfaces
pnet0		8000.000c29a64738	no		eth0
pnet1		8000.000000000000	no		
pnet2		8000.000000000000	no		
pnet3		8000.000000000000	no		
pnet4		8000.000000000000	no		
pnet5		8000.000000000000	no		
pnet6		8000.000000000000	no		
pnet7		8000.000000000000	no		
pnet8		8000.000000000000	no		
pnet9		8000.000000000000	no		
vnet0_10		8000.4a0a86ed3eab	no		vunl0_2_2
							vunl0_8_0
vnet0_2		8000.761917c9b876	no		vunl0_2_0
vnet0_4		8000.defdfb09d1f0	no		vunl0_2_3
vnet0_5		8000.820959c052c3	no		vunl0_2_1

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Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_0
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_0
Dec 15 12:32:35 eve-ng kernel: [ 1941.204535] vnet0_2: port 1(vunl0_2_0) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.204537] vnet0_2: port 1(vunl0_2_0) entered forwarding state
Dec 15 12:32:35 eve-ng kernel: [ 1941.204680] vnet0_2: port 1(vunl0_2_0) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.204738] device vunl0_2_0 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.204739] vnet0_2: port 1(vunl0_2_0) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18566]: Could not generate persistent MAC address for vunl0_2_0: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.258816] vnet0_2: port 1(vunl0_2_0) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.258817] vnet0_2: port 1(vunl0_2_0) entered disabled state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_1
Dec 15 12:32:35 eve-ng kernel: [ 1941.258915] device vunl0_2_0 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.258955] vnet0_2: port 1(vunl0_2_0) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.258956] vnet0_2: port 1(vunl0_2_0) entered forwarding state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_1
Dec 15 12:32:35 eve-ng kernel: [ 1941.265144] vnet0_5: port 1(vunl0_2_1) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.265146] vnet0_5: port 1(vunl0_2_1) entered forwarding state
Dec 15 12:32:35 eve-ng kernel: [ 1941.265356] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.265475] device vunl0_2_1 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.265481] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18657]: Could not generate persistent MAC address for vunl0_2_1: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.329449] vnet0_5: port 1(vunl0_2_1) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.329450] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.329496] device vunl0_2_1 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.329515] vnet0_5: port 1(vunl0_2_1) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.329516] vnet0_5: port 1(vunl0_2_1) entered forwarding state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_2
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_2
Dec 15 12:32:35 eve-ng kernel: [ 1941.335432] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.335538] device vunl0_2_2 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.335543] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18747]: Could not generate persistent MAC address for vunl0_2_2: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.389755] vnet0_10: port 1(vunl0_2_2) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.389756] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.389806] device vunl0_2_2 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.389828] vnet0_10: port 1(vunl0_2_2) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.389829] vnet0_10: port 1(vunl0_2_2) entered forwarding state
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00001|vsctl|INFO|Called as ovs-vsctl del-port vunl0_2_3
Dec 15 12:32:35 eve-ng ovs-vsctl: ovs|00002|db_ctl_base|ERR|no port named vunl0_2_3
Dec 15 12:32:35 eve-ng kernel: [ 1941.395991] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.396067] device vunl0_2_3 left promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.396073] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:35 eve-ng systemd-udevd[18837]: Could not generate persistent MAC address for vunl0_2_3: No such file or directory
Dec 15 12:32:35 eve-ng kernel: [ 1941.447331] vnet0_4: port 1(vunl0_2_3) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.447333] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:35 eve-ng kernel: [ 1941.447377] device vunl0_2_3 entered promiscuous mode
Dec 15 12:32:35 eve-ng kernel: [ 1941.447396] vnet0_4: port 1(vunl0_2_3) entered blocking state
Dec 15 12:32:35 eve-ng kernel: [ 1941.447397] vnet0_4: port 1(vunl0_2_3) entered forwarding state
Dec 15 12:32:36 eve-ng kernel: [ 1942.218950] vnet0_4: port 1(vunl0_2_3) entered disabled state
Dec 15 12:32:36 eve-ng kernel: [ 1942.218993] vnet0_10: port 1(vunl0_2_2) entered disabled state
Dec 15 12:32:36 eve-ng kernel: [ 1942.219026] vnet0_5: port 1(vunl0_2_1) entered disabled state
Dec 15 12:32:36 eve-ng kernel: [ 1942.219057] vnet0_2: port 1(vunl0_2_0) entered disabled state
In unl_wrapper i see the following

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Dec 15 11:01:29 INFO: starting /opt/unetlab/wrappers/qemu_wrapper -T 0 -D 2 -t "Utm5_a" -F /opt/qemu-2.12.0/bin/qemu-system-x86_64 -d 0 -x -- -device virtio-net-pci,netdev=net0,mac=00:50:00:00:02:00 -netdev tap,id=net0,ifname=vunl0_2_0,script=no -device virtio-net-pci,netdev=net1,mac=00:50:00:00:02:01 -netdev tap,id=net1,ifname=vunl0_2_1,script=no -device virtio-net-pci,netdev=net2,mac=00:50:00:00:02:02 -netdev tap,id=net2,ifname=vunl0_2_2,script=no -device virtio-net-pci,netdev=net3,mac=00:50:00:00:02:03 -netdev tap,id=net3,ifname=vunl0_2_3,script=no -smp 2 -m 8096 -name Utm5_a -uuid 21fdb527-daa8-4e54-9e83-12ae07e7fead -vnc :26870 -hda hda.qcow2 -machine type=pc,accel=kvm -vga std -usbdevice tablet -boot order=dc > /opt/unetlab/tmp/0/fc8a16c1-6f02-4bb6-bfbb-5afb4980ada5/2/wrapper.txt 2>&1 &

Dec 15 11:01:29 INFO: CWD is /opt/unetlab/tmp/0/fc8a16c1-6f02-4bb6-bfbb-5afb4980ada5/2
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_3.disable_ipv6=1
Dec 15 11:01:29 INFO: tunctl -u unl0 -g root -t vunl0_2_3 2>&1
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_2.disable_ipv6=1
Dec 15 11:01:29 INFO: tunctl -u unl0 -g root -t vunl0_2_2 2>&1
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_1.disable_ipv6=1
Dec 15 11:01:29 INFO: tunctl -u unl0 -g root -t vunl0_2_1 2>&1
Dec 15 11:01:29 INFO: sysctl -w net.ipv6.conf.vunl0_2_0.disable_ipv6=1

What's wrong with Network? Why it keep saying there are no interfaces, while we see in brctl that they are? =\

romzhke
Posts: 6
Joined: Wed Oct 07, 2020 7:38 am

Re: Why my QEMU VM won't start?

Post by romzhke » Tue Dec 15, 2020 11:07 am

So now i think the issue is not with the network. this is logs from another VM, same linux image (they are in cluster with the first one). and it runs OK:
But what then?

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Dec 15 13:06:36 eve-ng systemd-udevd[3915]: Could not generate persistent MAC address for vnet0_3: No such file or directory
Dec 15 13:06:36 eve-ng systemd-udevd[3961]: Could not generate persistent MAC address for vnet0_6: No such file or directory
Dec 15 13:06:36 eve-ng systemd-udevd[4051]: Could not generate persistent MAC address for vunl0_3_0: No such file or directory
Dec 15 13:06:36 eve-ng kernel: [ 3981.781654] vnet0_3: port 1(vunl0_3_0) entered blocking state
Dec 15 13:06:36 eve-ng kernel: [ 3981.781655] vnet0_3: port 1(vunl0_3_0) entered disabled state
Dec 15 13:06:36 eve-ng kernel: [ 3981.781695] device vunl0_3_0 entered promiscuous mode
Dec 15 13:06:36 eve-ng systemd-udevd[3915]: Could not generate persistent MAC address for vunl0_3_1: No such file or directory
Dec 15 13:06:36 eve-ng kernel: [ 3981.791773] vnet0_6: port 1(vunl0_3_1) entered blocking state
Dec 15 13:06:36 eve-ng kernel: [ 3981.791774] vnet0_6: port 1(vunl0_3_1) entered disabled state
Dec 15 13:06:36 eve-ng kernel: [ 3981.791813] device vunl0_3_1 entered promiscuous mode
Dec 15 13:06:36 eve-ng kernel: [ 3981.791831] vnet0_6: port 1(vunl0_3_1) entered blocking state
Dec 15 13:06:36 eve-ng kernel: [ 3981.791832] vnet0_6: port 1(vunl0_3_1) entered forwarding state
Dec 15 13:06:36 eve-ng systemd-udevd[3961]: Could not generate persistent MAC address for vunl0_3_2: No such file or directory
Dec 15 13:06:36 eve-ng systemd-udevd[4133]: Could not generate persistent MAC address for vunl0_3_3: No such file or directory
Dec 15 13:06:36 eve-ng kernel: [ 3981.809575] vnet0_4: port 2(vunl0_3_3) entered blocking state
Dec 15 13:06:36 eve-ng kernel: [ 3981.809576] vnet0_4: port 2(vunl0_3_3) entered disabled state
Dec 15 13:06:36 eve-ng kernel: [ 3981.809612] device vunl0_3_3 entered promiscuous mode
Dec 15 13:06:36 eve-ng kernel: [ 3981.809624] vnet0_4: port 2(vunl0_3_3) entered blocking state
Dec 15 13:06:36 eve-ng kernel: [ 3981.809624] vnet0_4: port 2(vunl0_3_3) entered forwarding state
Dec 15 13:06:36 eve-ng kernel: [ 3981.840625] vnet0_3: port 1(vunl0_3_0) entered blocking state
Dec 15 13:06:36 eve-ng kernel: [ 3981.840627] vnet0_3: port 1(vunl0_3_0) entered forwarding state
Dec 15 13:06:54 eve-ng kernel: [ 3999.871872] kvm [4354]: vcpu0, guest rIP: 0xffffffff8105dd48 disabled perfctr wrmsr: 0xc2 data 0xffff

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