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Bug 1505330 - No dhcp on virbr0 on s390 in guest
Summary: No dhcp on virbr0 on s390 in guest
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.4-Alt
Hardware: s390x
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Libvirt Maintainers
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-10-23 10:58 UTC by Lukas Doktor
Modified: 2017-11-02 17:53 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2017-11-02 17:53:29 UTC
Target Upstream Version:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1503507 0 unspecified CLOSED libvirt doesn't set up the network properly 2022-05-16 11:32:56 UTC

Internal Links: 1503507

Description Lukas Doktor 2017-10-23 10:58:09 UTC 
Description of problem:
I'm getting no responses in guest when using virbr0 provided by libvirt. The network seems to work well when the IP addr is assigned manually and bridge used by libvirt.

Version-Release number of selected component (if applicable):
Host: RHEL-ALT-7.5-20171017.n.0
Kernel: https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=606293
Qemu: https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=607145

How reproducible:
Always

Steps to Reproduce:
1. /usr/libexec/qemu-kvm -device virtio-scsi-ccw,id=virtio_scsi_ccw0 -drive id=drive_image1,if=none,format=qcow2,file=rhel
7devel-s390x.qcow2 -device scsi-hd,id=image1,drive=drive_image1 -snapshot -m 2G -nographic -nodefaults -chardev socket,
id=serial_id_serial0,path=/tmp/aaa,server,nowait -device sclpconsole,chardev=serial_id_serial0 -device virtio-net-ccw,n
etdev=net0,mac=DE:AD:BE:EF:AA:BB -netdev bridge,br=virbr0,id=net0

Actual results:
Machine boots, network card available, but no ipv4 address available and `dhclient -d eth0` does not show any answers. When IP address manually assigned, host and guest can communicate just well.

Expected results:
Machine should boot and obtain the IP address automatically

Additional info:
I tried creating machine with `virsh` and they also suffered the same issue. I also tried stop/start the network in virt-manager as well as create a new one without any luck.
Comment 2 Lukas Doktor 2017-10-23 10:59:47 UTC 
I forgot to mention `user` network works well.
Comment 3 Laine Stump 2017-10-25 09:06:56 UTC 
Last week Rich filed Bug 1503507 against libvirt in Fedora Rawhide, with similar circumstances and symptoms. In particular, he was using qemu:///session (unprivileged libvirt) which uses qemu-bridge-helper to create the tap device and connect it to the bridge, and he also saw failure to acquire an IP with dhclient, but everything worked fine when an IP address was manually assigned.

His suspicion is that it is a host kernel issue, and I don't have an alternative explanation. If there is an older kernel you can try to see if the problem disappears, that would be useful information.
Comment 4 Lukas Doktor 2017-11-02 17:53:29 UTC 
Today I tried the RHEL-ALT-7.4-20171102.n.0-Server-s390x-dvd1.iso and it worked well. Either it's because I used directly LPAR (previously it was z/vm) to run the guest or this was fixed. I'll re-open this if I see this issue again.
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