Hi Joe, We verified the test kernel for Trusty from comment #8, however it does not seem to be resolving the issue, as we ran into a different issue.
With the test kernel 3.13.0-105.152~lp1636656_amd64 the VM is loosing network connectivity if we corrupt the packages and transfer a file. This behavior is not seen in all the other kernels already tested, so it seems to be specific to be backport to 3.13 - dependency patches maybe? Using the latest kernel for Trusty - 3.13.0-105-generic - we do *not* observe the netvsc messages if we corrupt the packages. I will have to check this internally if the given bug here might have been introduced in a later kernel, will reply once we clarify the situation for Trusty. Last question would be that in order to include the netvsc patch in 3.13, did you have to backport other patches? If so, can you please provide us with the list of them, that might help to understand the behavior. Thank you! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1636656 Title: [Hyper-V] netvsc: fix incorrect receive checksum offloading Status in linux package in Ubuntu: In Progress Status in linux source package in Trusty: In Progress Status in linux source package in Vivid: In Progress Status in linux source package in Xenial: In Progress Status in linux source package in Yakkety: In Progress Bug description: The Hyper-V netvsc driver was looking at the incorrect status bits in the checksum info. It was setting the receive checksum unnecessary flag based on the IP header checksum being correct. The checksum flag is skb is about TCP and UDP checksum status. Because of this bug, any packet received with bad TCP checksum would be passed up the stack and to the application causing data corruption. The problem is reproducible via netcat and netem. This had a side effect of not doing receive checksum offload on IPv6. The driver was also also always doing checksum offload independent of the checksum setting done via ethtool. Signed-off-by: Stephen Hemminger <sthem...@microsoft.com> https://patchwork.ozlabs.org/patch/685660/ When this patch is committed I will include the commit ID in this bug. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1636656/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
