Description of problem: I have VLANs on top of a physical network, managed by networkd. In Fedora 30, which I just upgraded to, something in the stack of systemd, networkd, and udevd attempts to rename all of my VLAN devices (eg 'em-dev2') to the name of the underlying physical device ('em0'). Naturally this fails, since the underlying physical device is already using the name. One consequence of this failure is that a 'sys-subsystem-net-devices-<name>.device' systemd unit never appears for the VLAN devices, so any other units that depend on those units fail (they may depend on them so that they can delay starting until my VLANs are set up, for example). This doesn't appear to depend on the specific form of the VLAN network names; in the process of attempting to deal with this, I renamed them from a 'em0.151' form to 'em-dev2'. The devices are fully configured despite this problem, with IP addresses and so on. I am not certain if there are other side effects beyond the systemd unit failure. This very much did not happen in Fedora 29. Version-Release number of selected component (if applicable): systemd-udev-241-10.git511646b.fc30.x86_64 systemd-241-10.git511646b.fc30.x86_64 How reproducible: Completely. It happens every time the system boots. Actual results: Log messages of the form: Aug 15 15:08:58 hawkwind.cs systemd-udevd[1082]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable. Aug 15 15:08:58 haAug 15 15:08:58 hawkwind.cs systemd-udevd[1082]: Using default interface naming scheme 'v240'. wkwind.cs systemd-udevd[1082]: em-dev2: Failed to rename network interface 4 from 'em-dev2' to 'em0': File exists Despite this error, systemd-networkd will later report 'em-dev2: netdev ready'. Additional information: 'udevadm info /sys/class/net/em-dev2' reports: P: /devices/virtual/net/em-dev2 L: 0 E: DEVPATH=/devices/virtual/net/em-dev2 E: DEVTYPE=vlan E: INTERFACE=em-dev2 E: IFINDEX=4 E: SUBSYSTEM=net E: USEC_INITIALIZED=6992333 E: ID_MM_CANDIDATE=1 E: ID_NET_DRIVER=802.1Q VLAN Support E: ID_NET_LINK_FILE=/etc/systemd/network/10-em0-amd.link E: ID_NET_NAME=em0 E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/em0 E: TAGS=:systemd: It may be relevant that my base device has multiple VLANs and an assigned IP address (for untagged traffic). I also set 'biosdevname=0' on the kernel command line; networkd finds the interface it will name em0 by MAC address.
I think this is most likely caused by some "rogue" udev rule provided externally. Please attach the output of "systemd-analyze cat-config udev/rules.d" and "sudo SYSTEMD_LOG_LEVEL=debug udevadm test /sys/class/net/em-dev2".
I've upgraded to Fedora 31 since this report, but the issue appears to still be present based on the 'failed to rename' messages still being present in journalctl logs. I'll attach the two files of output to this issue.
Created attachment 1647554 [details] output from 'systemd-analyze cat-config udev/rules.d'
Created attachment 1647555 [details] output from 'SYSTEMD_LOG_LEVEL=debug udevadm test /sys/class/net/em-dev2'
I think I see what is happening here from the udevadm output. The VLAN devices have the same MAC as the underlying physical device, and so they match the /etc/systemd/network/10-em0-amd.link file that recognizes the physical device and gives it a name: # ASUS Prime X370-PRO AMD motherboard onboard port, for the new hardware. [Match] MACAddress=60:45:cb:a0:e8:dd [Link] Description=Onboard port MACAddressPolicy=persistent Name=em0 I think that networkd or udevd must have changed how matching was handled in some version, so that now this should have a 'Type=' of some value. But I don't know what 'Type=' to use here; I can't see what DEVTYPE udev assigns for physical ports in eg 'udevadm test' of one.
Yeah, in systemd-241 we added a new NamingPolicy=keep value. The default .link file was changed to have "keep", while the general idea was that user-provided files would not include "keep", so that they would rename interfaces even if they were previously given a name by userspace. This was done because users were confused and annoyed when their explicit configuration was ignored. But for your case, the effect is bad. I think the easiest solution would be to add 'NamePolicy=keep' to your .link file. This should be enough to keep the vlan interfaces from being renamed. Please let me know if that works for you. I'm not sure if we need to make changes upstream. We didn't consider this case when making the change, but at this point I'm not sure if changing things yet again is better then keeping them stable.
Adding 'NamePolicy=keep' to my 10-em0-amd.link (in the '[Link]' section) appears to have resolved this issue for me; I no longer see logged complaints about 'failed to rename ...' and the systemd sys-subsystem-net-devices-<...>.device units are now created and shown as active, which they weren't before.
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Having just hit this, I can confirm setting Type= appropriately works as well, and may be less brittle. "networkctl status <interface>" shows the type.
For completeness, relevant upstream bug reports: https://github.com/systemd/systemd/issues/11992 https://github.com/systemd/systemd/issues/11921 For me, this issue seemed to be having a knock-on effect of preventing complete vlan initialization in a similar way to: https://github.com/systemd/systemd/issues/12308 (though the underlying cause in that report is different)