Public bug reported: Ubuntu 16.04 guest VM running under vmware hypervisor. VM is used for running qemu/docker instances of virtual routers.
After upgrade to linux-image-4.4.0-184-generic we get hard-lockup of the kernel (no interaction on the console, no crash report or anything) as soon as VM is put under load (several minutes in, 5 virtual routers started and configured). VM was running -177 or -178 for ~50 days without issue. I tested -179 as well, doesn't have this problem. linux-image-4.15.0-106-generic (latest hwe kernel) also doesn't have this problem. All of these are Ubuntu provided kernels installed using regular install process. So to sum up: Works: 4.4.0-177 to -179. 4.15.0-106 also works. Doesn't work: 4.4.0-184 causes immediate problems (within 10 minutes after starting this test/simulation environment). Hard-lockup only happens during the test and seems to be either memory/load dependent. Unfortunately I don't have any debug output because of this hard-lockup. $ sudo dpkg --list | grep -i linux-image ii linux-image-4.15.0-106-generic 4.15.0-106.107~16.04.1 amd64 Signed kernel image generic rc linux-image-4.4.0-177-generic 4.4.0-177.207 amd64 Signed kernel image generic rc linux-image-4.4.0-178-generic 4.4.0-178.208 amd64 Signed kernel image generic ii linux-image-4.4.0-179-generic 4.4.0-179.209 amd64 Signed kernel image generic ii linux-image-4.4.0-184-generic 4.4.0-184.214 amd64 Signed kernel image generic ii linux-image-generic 4.4.0.184.190 amd64 Generic Linux kernel image ii linux-image-generic-hwe-16.04 4.15.0.106.111 amd64 Generic Linux kernel image ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-184-generic 4.4.0-184.214 ProcVersionSignature: Ubuntu 4.15.0-106.107~16.04.1-generic 4.15.18 Uname: Linux 4.15.0-106-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.23 Architecture: amd64 Date: Fri Jun 26 07:10:53 2020 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: linux-signed (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1885249 Title: hard lock kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1885249/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs