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["H.-Dirk Schmitt" <dirk@xxxxxxxxxxxxxx>]

As above the same issue degraded my system after reboot from 4.8.0-46 to
4.8.0-49.


Apr 25 17:08:40 nermal systemd-udevd[165]: Could not set Alias, MACAddress or MTU on eth1: Invalid argument
Apr 25 17:08:40 nermal kernel: eth0: Invalid MTU 9000 requested, hw max 68


/etc/systemd/network/bslav1.link

# -*- Systemd -*-
[Match]
MACAddress=xx:xx:xx:xx:xx

[Link]
Name=bslave1
MTUBytes=9000


** Also affects: linux-hwe (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: linux-hwe (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1679823

Title:
  bond0: Invalid MTU 9000 requested, hw max 1500 with kernel 4.10 (or
  4.8.0-49)

Status in Linux:
  Unknown
Status in neutron:
  New
Status in linux package in Ubuntu:
  Triaged
Status in linux-hwe package in Ubuntu:
  Confirmed
Status in linux-hwe-edge package in Ubuntu:
  Confirmed

Bug description:
  Since I upgraded the kernel from linux-image-4.8.0-46-generic to
  linux-image-extra-4.10.0-14-generic I'm facing an issue when I want to
  change the MTU.

  It seems to be known bug already fixed:
  https://bugzilla.kernel.org/show_bug.cgi?id=194763

  # ip l sh eno49
  2: eno49: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 9000 qdisc mq master bond0 state UP mode DEFAULT group default qlen 1000
      link/ether 5c:b9:01:8a:61:e9 brd ff:ff:ff:ff:ff:ff

  # ip l sh eno50
  3: eno50: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 9000 qdisc mq master bond0 state UP mode DEFAULT group default qlen 1000
      link/ether 5c:b9:01:8a:61:e9 brd ff:ff:ff:ff:ff:ff

  # ip l sh bond0
  6: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
      link/ether 5c:b9:01:8a:61:e9 brd ff:ff:ff:ff:ff:ff

  # ip l set mtu 9000 bond0
  RTNETLINK answers: Invalid argument

  root@controller002[SRV][YUL]:~# tail -1 /var/log/syslog
  Apr  4 19:36:28 controller002 kernel: [ 8869.077853] bond0: Invalid MTU 9000 requested, hw max 1500

  # modinfo ixgbe
  filename:       /lib/modules/4.10.0-14-generic/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe.ko
  version:        4.4.0-k
  license:        GPL
  description:    Intel(R) 10 Gigabit PCI Express Network Driver

  # modinfo bonding
  filename:       /lib/modules/4.10.0-14-generic/kernel/drivers/net/bonding/bonding.ko
  author:         Thomas Davis, tadavis@xxxxxxx and many others
  description:    Ethernet Channel Bonding Driver, v3.7.1
  version:        3.7.1

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