[Kernel-packages] [Bug 1679823] Re: bond0: Invalid MTU 9000 requested, hw max 1500 with kernel 4.10 (or 4.8.0-49)

[Ryan Tucker]

The kernel in #38 does fix this for Zerotier TAP interfaces as well.

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

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Triaged
Status in linux-hwe package in Ubuntu:
  Confirmed
Status in linux-hwe-edge package in Ubuntu:
  Confirmed
Status in linux source package in Yakkety:
  In Progress
Status in linux-hwe source package in Yakkety:
  Confirmed
Status in linux-hwe-edge source package in Yakkety:
  Confirmed
Status in linux source package in Zesty:
  Fix Released
Status in linux-hwe source package in Zesty:
  Confirmed
Status in linux-hwe-edge source package in Zesty:
  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:  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:  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:  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, tada...@lbl.gov and many others
  description:Ethernet Channel Bonding Driver, v3.7.1
  version:3.7.1

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[Kernel-packages] [Bug 1545542] Re: Enable arm64 emulation of removed ARMv7 instructions

[Ryan Tucker]

As the original impetus for this bug report: I cannot personally verify
that this solves the original problem
(https://answers.launchpad.net/launchpad/+question/285505) as it
manifests itself on the Launchpad build farm and I do not have necessary
hardware to reproduce this independently.

Latest attempt is https://launchpadlibrarian.net/242901620
/buildlog_ubuntu-precise-
armhf.bladerf_2016.01-rc1+1SNAPSHOT20160225213708-git61c3b57~precise_BUILDING.txt.gz
... note presence of "Illegal instruction" within the log, and the
kernel version of 4.2.0-30-generic on aarch64.

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Title:
  Enable arm64 emulation of removed ARMv7 instructions

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released

Bug description:
  Linux now supports emulation of three deprecated ARMv7 features that
  were removed from ARMv8: SWP(B), CP15ISB/DSB/DMB, and SETEND. At least
  CP15DMB is used by some armhf archive binaries (notably pandoc), so we
  need emulation enabled on the kernels that scalingstack uses.

  I haven't checked which version added which, but they appeared some
  time between 3.13 and 4.2, and I only care about 4.2 onwards. So
  please enable ARMV8_DEPRECATED, SWP_EMULATION, CP15_BARRIER_EMULATION
  and SETEND_EMULATION in arm64 kernels for wily onwards.

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