Comment 85 for bug 1729674

You will want to contact Dell support on that one as it appears you are
running a non- Ubuntu kernel version (it's probably Dell provided). You
might simply need to upgrade.

On Thu, Mar 28, 2019, 3:40 PM Maxwell Ballenger <email address hidden>
wrote:

> Thanks for the work you all have done tracking this down. I am
> experiencing an issue with identical symptoms. I understand the problem
> should be fixed with 4.15+, so I may be experiencing a different bug. If
> anyone could help me determine that conclusively or point me in a
> direction that might help me fix this one, I'd really appreciate it!
>
> Below I have reproduced the issue in the same way as above, with the
> same workaround.
>
> Dell Precision 5530
> TB16 Dock
> Ubuntu 18.04
> Kernel: 4.15.0-1034-oem
>
> $ sudo ethtool --offload enx3c2c30b2d39a rx on
> $ for i in 1 2 3 4 5 6 7 8 9; do curl -s
> http://old-releases.ubuntu.com/releases/17.04/ubuntu-17.04-server-amd64.img
> -o $i.iso; md5sum $i.iso; done
> 4672ce371fb3c1170a9e71bc4b2810b9 1.iso
> 5cfcb270becce9962c0dc305dac943b9 2.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 3.iso
> ba8ec5ef56501dbab731dcd0e627a334 4.iso
> 7d5d892efa5899a99129d90167508434 5.iso
> c0402e3a6a1179d77c3132e15af2b81f 6.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 7.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 8.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 9.iso
> $ sudo ethtool --offload enx3c2c30b2d39a rx off
> $ for i in 1 2 3 4 5 6 7 8 9; do curl -s
> http://old-releases.ubuntu.com/releases/17.04/ubuntu-17.04-server-amd64.img
> -o $i.iso; md5sum $i.iso; done
> 4672ce371fb3c1170a9e71bc4b2810b9 1.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 2.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 3.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 4.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 5.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 6.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 7.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 8.iso
> 4672ce371fb3c1170a9e71bc4b2810b9 9.iso
> $ uname -r
> 4.15.0-1034-oem
> $
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1729674
>
> Title:
> TB16 dock ethernet corrupts data with hw checksum silently failing
>
> Status in Dell Sputnik:
> Triaged
> Status in linux package in Ubuntu:
> Fix Released
> Status in linux source package in Xenial:
> Fix Released
> Status in linux source package in Artful:
> Fix Released
> Status in linux source package in Bionic:
> Fix Released
> Status in linux package in Fedora:
> Confirmed
>
> Bug description:
> It looks like TCP rx and tx checksum offloading is broken on the TB16
> dock's ethernet adapter. For example downloading a large file such as the
> Ubuntu ISO, and then running an md5sum on it yields the incorrect md5sum.
> This is because
> rx-checksumming: on
> tx-checksumming: on
> and both set to on by default.
>
> Running sudo ethtool -K <TB16 eth device> tx off rx off, allows the
> download to complete correctly. This is very bad since this can cause
> very bad untrustworthy behavior.
>
> This was conducted using an Dell Precision 5520 on Ubuntu 16.04+linux-
> generic-hwe-16.04-edge.
>
> Thank you
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/dell-sputnik/+bug/1729674/+subscriptions
>
> Launchpad-Notification-Type: bug
> Launchpad-Bug: product=dell-sputnik; status=Triaged; importance=High;
> assignee=None;
> Launchpad-Bug: distribution=ubuntu; sourcepackage=linux; component=main;
> milestone=ubuntu-18.04; status=Fix Released; importance=High; assignee=
> <email address hidden>;
> Launchpad-Bug: distribution=ubuntu; distroseries=xenial;
> sourcepackage=linux; component=main; status=Fix Released;
> importance=Undecided; assignee=None;
> Launchpad-Bug: distribution=ubuntu; distroseries=artful;
> sourcepackage=linux; component=main; status=Fix Released; importance=High;
> assignee=None;
> Launchpad-Bug: distribution=ubuntu; distroseries=bionic;
> sourcepackage=linux; component=main; milestone=ubuntu-18.04; status=Fix
> Released; importance=High; <email address hidden>;
> Launchpad-Bug: distribution=fedora; sourcepackage=linux; component=None;
> status=Confirmed; importance=Undecided; assignee=None;
> Launchpad-Bug-Tags: indeed verification-done-artful
> verification-done-xenial
> Launchpad-Bug-Information-Type: Public
> Launchpad-Bug-Private: no
> Launchpad-Bug-Security-Vulnerability: no
> Launchpad-Bug-Commenters: ballengerm benjamin-redhat-bugs chiluk
> christian-redhat-bugs gerben-redhat-bugs janitor jarod-redhat-bugs
> jeremy-redhat-bugs jiri-redhat-bugs kai-heng-redhat-bugs kaihengfeng katamo
> luciano marianne-z mario-redhat-bugs martin-redhat-bugs pandasauce smb
> superm1 ubuntu-kernel-bot
> Launchpad-Bug-Reporter: Dave Chiluk (chiluk)
> Launchpad-Bug-Modifier: Maxwell Ballenger (ballengerm)
> Launchpad-Message-Rationale: Subscriber
> Launchpad-Message-For: chiluk
>