GitHub user arpanbht edited a discussion: cloudstack vnet creating error while
adding arm devices to cloudstack
We are trying to add a nvidia jetson agx thor to our existing cloudstack
management server as a kvm host we have setup that machine and did pci
passthrough and enabled iommu, the machine is getting added to cloudstack but
we are facing these kind of error
```
net/modifyvlan.sh -v 1644 -p -b br-1644 -o add ] encountered the error:
[Cannot find device
"br-1644"/usr/share/cloudstack-common/scripts/vm/network/vnet/modifyvlan.sh:
line 37: /proc/sys/net/ipv6/conf/br-1644.1644/disable_ipv6: No such file or
directoryCannot find device "br-1644.1644"Failed to create vlan 1644 on pif:
br-1644.].
2026-04-10 06:57:19,637 WARN [resource.wrapper.LibvirtStartCommandWrapper]
(AgentRequest-Handler-1:[]) (logid:0d10c5a1) InternalErrorException
com.cloud.exception.InternalErrorException: Failed to create vnet 1644: Cannot
find device
"br-1644"/usr/share/cloudstack-common/scripts/vm/network/vnet/modifyvlan.sh:
line 37: /proc/sys/net/ipv6/conf/br-1644.1644/disable_ipv6: No such file or
directoryCannot find device "br-1644.1644"Failed to create vlan 1644 on pif:
br-1644.
at
com.cloud.hypervisor.kvm.resource.BridgeVifDriver.createVnet(BridgeVifDriver.java:338)
at
com.cloud.hypervisor.kvm.resource.BridgeVifDriver.createVnetBr(BridgeVifDriver.java:320)
at
com.cloud.hypervisor.kvm.resource.BridgeVifDriver.plug(BridgeVifDriver.java:239)
at
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.createVif(LibvirtComputingResource.java:3861)
at
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.createVifs(LibvirtComputingResource.java:3438)
at
com.cloud.hypervisor.kvm.resource.wrapper.LibvirtStartCommandWrapper.execute(LibvirtStartCommandWrapper.java:86)
at
com.cloud.hypervisor.kvm.resource.wrapper.LibvirtStartCommandWrapper.execute(LibvirtStartCommandWrapper.java:52)
at
com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRequestWrapper.execute(LibvirtRequestWrapper.java:78)
at
com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:2280)
at com.cloud.agent.Agent.processRequest(Agent.java:813)
at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:1295)
at com.cloud.utils.nio.Task.call(Task.java:83)
at com.cloud.utils.nio.Task.call(Task.java:29)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)
2026-04-10 06:57:19,637 INFO [kvm.storage.LibvirtStorageAdaptor]
(AgentRequest-Handler-1:[]) (logid:0d10c5a1) Trying to fetch storage pool
a04d1dfc-8cf5-3db0-a2ef-37a92c1bcb9d from libvirt
2026-04-10 06:57:19,696 INFO [kvm.resource.LibvirtConnection]
(AgentRequest-Handler-3:[]) (logid:0d10c5a1) No existing libvirtd connection
found. Opening a new one
2026-04-10 06:57:19,697 WARN [kvm.resource.LibvirtConnection]
(AgentRequest-Handler-3:[]) (logid:0d10c5a1) Can not find a connection for
Instance i-2-2001-VM. Assuming the default connection.
```
Let me know if any additional information is needed in order to solve this
problem.
Please help. 🥲
GitHub link: https://github.com/apache/cloudstack/discussions/12997
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