[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
*** This bug is a duplicate of bug 1683947 *** https://bugs.launchpad.net/bugs/1683947 Hi Jason, actually we found out that someone else already had been requesting those changes last week. It was decided that it is better to get these changes out quickly so it should be in the next few days. I will mark your report as a duplicate to the older age report. ** This bug has been marked a duplicate of bug 1683947 ubuntu 4.8 kernel, virtio_net error causes NAT packets to be lost -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
SRU Justification: Impact: Currently we carry changes to virtio in Yakkety (Xenial/HWE) which got fixed in 4.9.y upstream. However 4.8.y went out of support before that. This causes packets accidentally be dropped when forwarded between various KVM instances (which affects all KVM based Yakkety kernels but also GCE instances as they use the hwe kernel for xenial installations, too). Fix: Cherry picked the two requested patches from 4.9.y upstream Testcase: TBD -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
Hi Stefan -- thanks for taking ownership of this bug. Could you give a rough timeline on when you expect to roll out the next kernel update that contains these commits? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
** Also affects: linux (Ubuntu Yakkety) Importance: Undecided Status: New ** Also affects: linux-hwe (Ubuntu Yakkety) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Yakkety) Importance: Undecided => Medium ** Changed in: linux (Ubuntu Yakkety) Status: New => In Progress ** Changed in: linux (Ubuntu Yakkety) Assignee: (unassigned) => Stefan Bader (smb) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
** Also affects: linux-hwe (Ubuntu) Importance: Undecided Status: New ** Changed in: linux-hwe (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
No such log is necessary. You simply forgot to backport two critical patches. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1685416] Re: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets
** Description changed: The HWE kernel, and possibly others too, backport some virtio improvements related to setting VIRTIO_NET_HDR_F_DATA_VALID on received packets so that the CPU doesn't have to checksum packets that have already been verified by hardware. In the initial implementation of this, the kernel erroneously set this flag too for transmitted packets, which is explicitly forbidden by the virtio spec. It was rectified in these two commits: 501db511397fd6efff3aa5b4e8de415b9550 + https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=501db511397fd6efff3aa5b4e8de415b9550 + 6391a4481ba0796805d6581e42f9f0418c099e34 + https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6391a4481ba0796805d6581e42f9f0418c099e34 - Both of these must be backported into your HWE kernel, and perhaps other - Ubuntu kernels too. While mostly nobody cares about this "correctness" + Both of these must be backported into your HWE kernel and perhaps other + Ubuntu kernels too. (They were both backported into the kernel.org + stable kernels.) While mostly nobody cares about this "correctness" issue, it turns out that Google Cloud Platform -- which uses the HWE kernel by default -- does care and will silently and mysteriously drop packets. This leads to packets being dropped entirely when being forwarded between various types of network drivers. This issue must be fixed in order to use Ubuntu on Google Cloud Platform. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685416 Title: Virtio Fixes Not Backported --> Google Cloud Platform Drops Packets To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
