Ubuntu
systemd package

  1. Bug #1593379
  2. Comment #0

Comment 0 for bug 1593379

Revision history for this message
Steve Wormley (9-lp) wrote : systemd 229-4ubuntu6 ignores net.ifnames=0 on USB

Description: Ubuntu 16.04 LTS
Release: 16.04

The upgrade to systemd/udev 229-4ubuntu6 breaks net.ifnames=0 for USB devices.

It appears the regression is here:
* Set MAC based name for USB network interfaces only for universally
    administered (i. e. stable) MACs, not for locally administered (i. e.
    randomly generated) ones. Drop /lib/systemd/network/90-mac-for-usb.link
    (as link files don't currently support globs for MACAddress=) and replace
    with an udev rule in /lib/udev/rules.d/73-special-net-names.rules.
    (Closes: #812575, LP: #1574483)

As Raspberry Pi's use eth0 via USB, this breaks running systems.

Before:
ii systemd 229-4ubuntu4 armhf system and service manager
ii udev 229-4ubuntu4 armhf /dev/ and hotplug management daem

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether b8:27:eb:16:39:e9 brd ff:ff:ff:ff:ff:ff

After:

ii systemd 229-4ubuntu6 armhf system and service manager
ii udev 229-4ubuntu6 armhf /dev/ and hotplug management daemon

3: enxb827eb1639e9: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
    link/ether b8:27:eb:16:39:e9 brd ff:ff:ff:ff:ff:ff

cat /proc/cmdline
dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2709.boardrev=0xa01041 bcm2709.serial=0x37b38253 smsc95xx.macaddr=B8:27:EB:B3:82:53 bcm2708_fb.fbswap=1 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 sdhci-bcm2708.emmc_clock_freq=250000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 net.ifnames=0 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

With the default interfaces configuration, all networking is lost on reboot after upgrade.