Been doing some troubleshooting and we think we've found the fix for
this issue:
The script /etc/network/if-pre-up.d/vlan contains the following section
of code starting at line 62:
if [ ! -e "/sys/class/net/$IFACE" ]; then
# Try ifup for the raw device, if it fails then bring it up directly
# this is required e.g. there is no configuration for the raw device
ifup $IF_VLAN_RAW_DEVICE || ip link set up dev $IF_VLAN_RAW_DEVICE
vconfig add $IF_VLAN_RAW_DEVICE $VLANID
fi
In this case it's trying to bring up a raw device that has already been
brought up, causing it to wait forever for the lock on the raw interface
to be released. It is however lacking a check on the status of the raw
interface, which it shouldn't have to bring up if it already exists. So
this problem goes away when we put an if-statement around that section
of the code:
if [ ! -e "/sys/class/net/$IFACE" ]; then
if ! `cat /sys/class/net/$IF_VLAN_RAW_DEVICE/operstate 2> /dev/null | grep
-q "up"`; then
# Try ifup for the raw device, if it fails then bring it up directly
# this is required e.g. there is no configuration for the raw device
ifup $IF_VLAN_RAW_DEVICE || ip link set up dev $IF_VLAN_RAW_DEVICE
fi
vconfig add $IF_VLAN_RAW_DEVICE $VLANID
fi
It seems to work perfectly, tested on these cases:
1) a vlan on top of a single enp0sX interface without untagged network
configuration
2) a vlan on top of a single enp0sX interface with its own untagged network
configuration
3) a vlan on top of a bond of two enp0sX interfaces, without the bond having
its own untagged network configuration
4) a vlan on top of a bond of two enp0sX interfaces, with the bond having its
own untagged network configuration
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https://bugs.launchpad.net/bugs/1759573
Title:
vlan on top of untagged network won't start
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