Hi, I can confirm that this report makes sense. I was the person reporting it upstream and doing some debugging/bisecting to find the cause.
https://lists.xenproject.org/archives/html/xen- devel/2018-12/msg02403.html The bug causes the uptime of the two dom0s that live migration is done from/to to have an effect on the uptime counter (as seen in dmesg output) of the domU. This causes TCP timestamps to bork all over the place and cause network connections to stall. I'd advise the reporter to test this kernel with the patch applied and use it in a reproduction scenario, where live migrate hits the bug all the time, and where it doesn't hit it anymore with the patch. Thanks, Hans -- 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/1830440 Title: Xen guest time corrupted after live migration in linux- image-4.15.0-50-generic and linux-image-generic-hwe-18.04 Status in linux package in Ubuntu: Confirmed Bug description: Effects observed after migration include: * Stalled SSH connections. * A crashed or unresponsive virtual machine. * Inability to properly shut down the virtual machine. * Incorrect timestamps in dmesg output. The only effect that is really guaranteed is incorrect timestamps, but the rest are reproducible. This issue was fixed in version 5.0.0 of the Linux kernel, and the fix was backported to older supported kernels such as 4.14 and 4.19. Please cherry-pick the following commit from the master branch of the Linux kernel's git repo: 867cefb4cb1012f42cada1c7d1f35ac8dd276071 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830440/+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
