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  1. RHEL
  2. RHEL-42486

Network is unavailable after migration on s390x [rhel-10]

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    • Yes
    • Important
    • Regression, CustomerScenariosInitiative
    • 2
    • rhel-virt-hwe-s390x
    • ssg_virtualization
    • 12
    • 16
    • 0
    • QE ack
    • False
    • False
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      None

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    • Yes
    • Red Hat Enterprise Linux
    • zKVM CY25 sprint 4, zKVM Planning
    • Known Issue
    • Hide
      .Migrating virtual machines on IBM Z sometimes removes network configuration

      Currently, after migrating a virtual machine (VM) between IBM Z hosts, the VM's network configuration is in some cases reset, which causes the network to become unavailable on the VM. To work around the issue, disable the `vhost-net` service before you start the VM migration.
      Show
      .Migrating virtual machines on IBM Z sometimes removes network configuration Currently, after migrating a virtual machine (VM) between IBM Z hosts, the VM's network configuration is in some cases reset, which causes the network to become unavailable on the VM. To work around the issue, disable the `vhost-net` service before you start the VM migration.
    • Done
    • s390x
    • Linux
    • None
    • Merge Request passes all submitter checks, Merge Request finished CI testing, Merge Request approved by peer review

      What were you trying to do that didn't work?
      After migration, check the guest network, found the network is not available:
      1. fail to ssh the guest through IP on dst host
      2. Ping fail on dst host:
      [root@s390x-kvm-016 ~]# ping 192.168.122.180
      PING 192.168.122.180 (192.168.122.180) 56(84) bytes of data.
      From 192.168.122.1 icmp_seq=1 Destination Host Unreachable
      From 192.168.122.1 icmp_seq=2 Destination Host Unreachable
      From 192.168.122.1 icmp_seq=3 Destination Host Unreachable
      From 192.168.122.1 icmp_seq=4 Destination Host Unreachable

       

      Please provide the package NVR for which bug is seen:
      hosts info: kernel-6.9.0-7.el10.s390x && qemu-kvm-9.0.0-2.el10.s390x
      guest info: kernel-6.9.0-7.el10.s390x

      How reproducible:
      50%

      Steps to reproduce
      1. Boot a VM on the source host
      2. Boot a VM on the destination host with appending '-incoming defer'
      3. Check the sshd service in VM, it runs well, get valid ip in guest
      4. Enable postcopy and postcopy-preempt on the src and dst host
      5. Migrate VM from src to dst, during migration is active, switch to postcopy phase
      6. After migration, check sshd and firewalld services(sshd is running, firewalld is inactive) in VM, try to connect guest through ssh + guest ip, try to ping the guest on dst host

      Expected results
      In step 6, the network of guest is good, can ping the guest, ssh connection succeeds

      Actual results
      [root@s390x-kvm-016 ~]# ssh -o UserKnownHostsFile=/dev/null -o PreferredAuthentications=password -p 22 root@192.168.122.180
      ssh: connect to host 192.168.122.180 port 22: No route to host
      [root@s390x-kvm-016 ~]# ping 192.168.122.180
      PING 192.168.122.180 (192.168.122.180) 56(84) bytes of data.
      From 192.168.122.1 icmp_seq=1 Destination Host Unreachable
      From 192.168.122.1 icmp_seq=2 Destination Host Unreachable
      From 192.168.122.1 icmp_seq=3 Destination Host Unreachable
      From 192.168.122.1 icmp_seq=4 Destination Host Unreachable

              thuth@redhat.com Thomas Huth
              rhn-support-xiaohli Xiaohui Li
              Thomas Huth Thomas Huth
              Xiaohui Li Xiaohui Li
              Jiří Herrmann Jiří Herrmann
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                Created:
                Updated: