apport information ** Tags added: apport-collected bionic ec2-images
** Description changed: The xen_netfront device is sometimes unresponsive after a hibernate and resume event. This is limited to the c4, c5, m4, m5, r4, r5 instance families, all of which are xen based, and support hibernation. When the issue occurrs, the instance is inaccessible without a full restart. Debugging by running a process which outputs regularly to the serial console shows that the instance is still running. A workaround is to build the xen_netfront module separately and restart the module and networking during the resume handler. For example: modprobe -r xen_netfront modprobe xen_netfront systemctl restart systemd-networkd With this workaround in place, the unresponsive issue is no longer observed. To reproduce this problem: 1) Launch an c4, c5, m4, m5, r4, r5 instance type with a 5.0 or 5.3 kernel with on-demand hibernation support enabled. 2) Start a long-running process which generates messages to the serial console 3) Begin observing these messages on the console (using the AWS UI or CLI to grab a screenshot). 4) Suspend and resume the instance, continuing to refresh the console screenshot. 5) The screenshot should continue to show updates even if ssh access is no longer working. + --- + ProblemType: Bug + ApportVersion: 2.20.9-0ubuntu7.9 + Architecture: amd64 + DistroRelease: Ubuntu 18.04 + Ec2AMI: ami-0edf3b95e26a682df + Ec2AMIManifest: (unknown) + Ec2AvailabilityZone: us-west-2a + Ec2InstanceType: m4.large + Ec2Kernel: unavailable + Ec2Ramdisk: unavailable + Package: linux-aws 4.15.0.1058.59 + PackageArchitecture: amd64 + ProcEnviron: + TERM=screen + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=C.UTF-8 + SHELL=/bin/bash + ProcVersionSignature: User Name 5.0.0-1025.28-aws 5.0.21 + Tags: bionic ec2-images + Uname: Linux 5.0.0-1025-aws x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: adm audio cdrom dialout dip floppy lxd netdev plugdev sudo video + _MarkForUpload: True ** Attachment added: "Dependencies.txt" https://bugs.launchpad.net/bugs/1864041/+attachment/5329809/+files/Dependencies.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1864041 Title: xen_netfront devices unresponsive after hibernation/resume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-aws/+bug/1864041/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
