Public bug reported: STEPS TO REPRODUCE
1. Use MAAS for deploying Ubuntu on bare metal servers. 2. Enable serial-over-lan in BIOS. 3. Enable console redirection in kernel parameters: console=tty0 console=ttyS1,115200n8 4. Connect to the ipmi console to watch the boot and installation process ipmiconsole -u <user> -p <pass> -h <host> 5. Start deploying the server with MAAS (bionic, GA kernel) It may require several re-deployments until you experience the issue. In my case, I'm deploying 9 bare metal machines at the same time. The issue typically surfaces on one random node, 50% of the time. 6. During the deployment, after first reboot, typically during execution of cloud-init scripts, the ipmi console freezes. Typically in the middle of printing out some output. You can still SSH to the node. While being logged into the node: - running 'ps aux' takes more than 20 seconds, - running 'systemctl' times out, - the number of zombie processes increases. Sometimes, running 'sosreport' unblocks the node, so that cloud-init scripts finish executing and the node shuts down as expected. Sometimes, only logging into the node with SSH unblocks it. 7. Eventually, after 30 minutes, MAAS marks the node as "Failed deployment". WORKAROUND Remove console redirection from kernel parameters (console=tty0 console=ttyS1,115200n8). AFFECTED HARDWARE Supermicro SYS-2029U-TR4 https://www.supermicro.com/en/products/system/2U/2029/SYS-2029U-TR4.cfm OTHER The issue does not affect Xenial with GA kernel. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Attachment added: "sosreport-lthcloud01-20200226191739.tar.xz" https://bugs.launchpad.net/bugs/1865145/+attachment/5331859/+files/sosreport-lthcloud01-20200226191739.tar.xz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1865145 Title: Ubuntu Bionic freezes on Supermicro hardware when console redirection is configured in kernel parameters To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1865145/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
