Public bug reported: A mutual customer is reporting ssh is not working on a Xenial based VM. This VM is running the 4.4 based Xenial kernel and not a custom linux- azure kernel.
After an investigation this is a known old signaling issue. The 4.4 based Xenial kernels require the following patch: vmbus: fix missing signaling in hv_signal_on_read() (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=13c5e97701091f9b02ded0c68809f8a6b08c747a). The patch is not in the upstream stable 4.4 tree, because it’s not needed there. Compared to the upstream 4.4 tree, Ubuntu 4.4.0-124-generic integrated more hv patches from the mainline kernel, e.g. Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read(), so it must pick up the above patch. We checked the latest Ubuntu 4.4 kernel (https://kernel.ubuntu.com/git/ubuntu/ubuntu- xenial.git/tree/?h=Ubuntu-4.4.0-146.172) and the patch is also absent there. The patch (13c5e97701091f9b02ded0c68809f8a6b08c747a) can be cleanly cherry-picked into Ubuntu-4.4.0-146.172. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: kernel-hyper-v ** Summary changed: - [Xenial] Customer could not SSH to Linux VM due to "VSC State Unhealthy" + [Xenial] Customer can not SSH to Linux VM due to "VSC State Unhealthy" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1826416 Title: [Xenial] Customer can not SSH to Linux VM due to "VSC State Unhealthy" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1826416/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
