You have been subscribed to a public bug: Description ===========
After apt upgrading to vmlinuz-7.0.0-1017-azure kernel from vmlinuz-6.17.0-1008-azure, I perform a live migration within our on-prem Hyper-V infrastructure. The system eventually kernel panics due to Out of Memory issues. Steps to reproduce ================== This is an Ubuntu 24.04 server with the following settings: 2 CPU Dynamic Memory set as follows: Startup: 4096MB Minimum: 1024MB Maximum: 4096MB Memory Buffer: 20% 40GB Disk Single Network adapter apt update apt upgrade -y reboot Live migrate to another host Expected result: no issues during or after migration Actual result: Watch the console after migration, Out of memory: Killed Process XXX entries begin to show for many services Eventually the console shows Kernel Panic Log example: 2026-10-15T17:36:28.439983+00:00 test-cdonahue-lnx-01 kernel: systemd-journal invoked oom-killer: gfp_mask=0x440dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO|__GFP_COMP), order=0, oom_score_adj=-250 2026-10-15T17:36:28.497925+00:00 test-cdonahue-lnx-01 kernel: oom_kill_process+0xd7/0x250 2026-10-15T17:36:28.497926+00:00 test-cdonahue-lnx-01 kernel: ? oom_evaluate_task+0x105/0x200 2026-10-15T17:36:28.497962+00:00 test-cdonahue-lnx-01 kernel: __alloc_pages_may_oom+0x109/0x1d0 2026-10-15T17:37:43.859683+00:00 test-cdonahue-lnx-01 kernel: oom_kill_process+0xd7/0x250 2026-10-15T17:37:43.859684+00:00 test-cdonahue-lnx-01 kernel: __alloc_pages_may_oom+0x109/0x1d0 2026-10-15T17:36:35.292360+00:00 test-cdonahue-lnx-01 systemd[1]: [email protected]: A process of this unit has been killed by the OOM killer. 2026-10-15T17:36:35.293002+00:00 test-cdonahue-lnx-01 systemd[1]: unattended-upgrades.service: A process of this unit has been killed by the OOM killer. 2026-10-15T17:36:35.293070+00:00 test-cdonahue-lnx-01 systemd[1]: udisks2.service: A process of this unit has been killed by the OOM killer. 2026-10-15T17:36:35.293153+00:00 test-cdonahue-lnx-01 systemd[1]: rsyslog.service: A process of this unit has been killed by the OOM killer. 2026-10-15T17:36:35.293228+00:00 test-cdonahue-lnx-01 systemd[1]: networkd-dispatcher.service: A process of this unit has been killed by the OOM killer. 2026-10-15T17:36:35.293365+00:00 test-cdonahue-lnx-01 systemd[1]: networkd-dispatcher.service: Failed with result 'oom-kill'. 2026-10-15T17:36:35.293527+00:00 test-cdonahue-lnx-01 systemd[1]: udisks2.service: Failed with result 'oom-kill'. 2026-10-15T17:36:35.293896+00:00 test-cdonahue-lnx-01 systemd[1]: rsyslog.service: Failed with result 'oom-kill'. 2026-10-15T17:36:35.294058+00:00 test-cdonahue-lnx-01 systemd[1]: unattended-upgrades.service: Failed with result 'oom-kill'. 2026-10-15T17:36:35.294123+00:00 test-cdonahue-lnx-01 systemd[1]: user-1000.slice: A process of this unit has been killed by the OOM killer. 2026-10-15T17:37:43.865762+00:00 test-cdonahue-lnx-01 kernel: [ pid ] uid tgid total_vm rss rss_anon rss_file rss_shmem pgtables_bytes swapents oom_score_adj name 2026-10-15T17:37:43.865945+00:00 test-cdonahue-lnx-01 kernel: oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/rsyslog.service,task=rsyslogd,pid=863,uid=103 2026-10-15T17:37:43.865946+00:00 test-cdonahue-lnx-01 kernel: Out of memory: Killed process 863 (rsyslogd) total-vm:222580kB, anon-rss:0kB, file-rss:3340kB, shmem-rss:0kB, UID:103 pgtables:76kB oom_score_adj:0 2026-10-15T17:37:43.865958+00:00 test-cdonahue-lnx-01 kernel: oom_reaper: reaped process 863 (rsyslogd), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB 2026-10-15T17:37:43.865962+00:00 test-cdonahue-lnx-01 kernel: (-profile) invoked oom-killer: gfp_mask=0xc2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC), order=0, oom_score_adj=0 2026-10-15T17:37:43.865984+00:00 test-cdonahue-lnx-01 kernel: oom_kill_process+0xd7/0x250 2026-10-15T17:37:43.865985+00:00 test-cdonahue-lnx-01 kernel: ? oom_evaluate_task+0x105/0x200 2026-10-15T17:37:43.865988+00:00 test-cdonahue-lnx-01 kernel: __alloc_pages_may_oom+0x109/0x1d0 ** Affects: ubuntu Importance: Undecided Status: New -- OOM issue after Hyper-V live migrating Ubuntu 24.04.5 with Azure kernel 7.x https://bugs.launchpad.net/bugs/2171007 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
