user@workstation:~$ ssh user@zbox Welcome to Ubuntu 23.04 (GNU/Linux 6.2.0-27-generic s390x) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Thu Aug 17 03:53:29 PM UTC 2023 System load: 0.32 Memory usage: 3% Processes: 212 Usage of /: 31.4% of 30.34GB Swap usage: 0% Users logged in: 0 * Strictly confined Kubernetes makes edge and IoT secure. Learn how MicroK8s just raised the bar for easy, resilient and secure K8s cluster deployment. https://ubuntu.com/engage/secure-kubernetes-at-the-edge 0 updates can be applied immediately. Last login: Thu Aug 17 15:49:26 2023 from 10.172.66.67 user@zbox:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 23.04 Release: 23.04 Codename: lunar user@zbox:~$ uname -a Linux zbox 6.2.0-27-generic #28-Ubuntu SMP Wed Jul 12 21:53:40 UTC 2023 s390x s390x s390x GNU/Linux user@zbox:~$ apt-cache policy kexec-tools kexec-tools: Installed: 1:2.0.22-2ubuntu3.1 Candidate: 1:2.0.22-2ubuntu3.1 Version table: 1:2.0.22-2ubuntu3.2 100 100 http://us.ports.ubuntu.com/ubuntu-ports lunar-proposed/main s390x Packages *** 1:2.0.22-2ubuntu3.1 500 500 http://ports.ubuntu.com/ubuntu-ports lunar-updates/main s390x Packages 100 /var/lib/dpkg/status 1:2.0.22-2ubuntu3 500 500 http://ports.ubuntu.com/ubuntu-ports lunar/main s390x Packages user@zbox:~$ sudo add-apt-repository -y "deb http://us.ports.ubuntu.com/ubuntu-ports/ $(lsb_release -sc)-proposed main universe" [sudo] password for user: Repository: 'deb http://us.ports.ubuntu.com/ubuntu-ports/ lunar-proposed universe main' Description: Archive for codename: lunar-proposed components: universe,main More info: http://us.ports.ubuntu.com/ubuntu-ports/ Adding repository. Found existing deb entry in /etc/apt/sources.list.d/archive_uri-http_us_ports_ubuntu_com_ubuntu-ports_-jammy.list Updating existing entry instead of using /etc/apt/sources.list.d/archive_uri-http_us_ports_ubuntu_com_ubuntu-ports_-lunar.list Adding disabled deb-src entry to /etc/apt/sources.list.d/archive_uri-http_us_ports_ubuntu_com_ubuntu-ports_-jammy.list Get:1 http://us.ports.ubuntu.com/ubuntu-ports lunar-proposed InRelease [255 kB] Hit:2 http://ports.ubuntu.com/ubuntu-ports lunar InRelease Hit:3 http://ports.ubuntu.com/ubuntu-ports lunar-updates InRelease Hit:4 http://ports.ubuntu.com/ubuntu-ports lunar-backports InRelease Hit:5 http://ports.ubuntu.com/ubuntu-ports lunar-security InRelease Fetched 255 kB in 1s (473 kB/s) Reading package lists... Done user@zbox:~$ sudo apt update Hit:1 http://us.ports.ubuntu.com/ubuntu-ports lunar-proposed InRelease Hit:2 http://ports.ubuntu.com/ubuntu-ports lunar InRelease Hit:3 http://ports.ubuntu.com/ubuntu-ports lunar-updates InRelease Hit:4 http://ports.ubuntu.com/ubuntu-ports lunar-backports InRelease Hit:5 http://ports.ubuntu.com/ubuntu-ports lunar-security InRelease Reading package lists... Done Building dependency tree... Done Reading state information... Done All packages are up to date. user@zbox:~$ sudo apt install kexec-tools=1:2.0.22-2ubuntu3.2 kdump-tools Reading package lists... Done Building dependency tree... Done Reading state information... Done kdump-tools is already the newest version (1:1.8.1ubuntu1). The following packages will be upgraded: kexec-tools 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. Need to get 55.0 kB of archives. After this operation, 0 B of additional disk space will be used. Do you want to continue? [Y/n] Y Get:1 http://us.ports.ubuntu.com/ubuntu-ports lunar-proposed/main s390x kexec-tools s390x 1:2.0.22-2ubuntu3.2 [55.0 kB] Fetched 55.0 kB in 0s (612 kB/s) Preconfiguring packages ... (Reading database ... 80901 files and directories currently installed.) Preparing to unpack .../kexec-tools_1%3a2.0.22-2ubuntu3.2_s390x.deb ... Unpacking kexec-tools (1:2.0.22-2ubuntu3.2) over (1:2.0.22-2ubuntu3.1) ... Setting up kexec-tools (1:2.0.22-2ubuntu3.2) ... Processing triggers for man-db (2.11.2-1) ... Scanning processes... Scanning processor microcode... Scanning linux images... Running kernel seems to be up-to-date (ABI upgrades are not detected). Failed to check for processor microcode upgrades. No services need to be restarted. No containers need to be restarted. No user sessions are running outdated binaries. No VM guests are running outdated hypervisor (qemu) binaries on this host. user@zbox:~$ apt-cache policy kexec-tools kexec-tools: Installed: 1:2.0.22-2ubuntu3.2 Candidate: 1:2.0.22-2ubuntu3.2 Version table: *** 1:2.0.22-2ubuntu3.2 100 100 http://us.ports.ubuntu.com/ubuntu-ports lunar-proposed/main s390x Packages 100 /var/lib/dpkg/status 1:2.0.22-2ubuntu3.1 500 500 http://ports.ubuntu.com/ubuntu-ports lunar-updates/main s390x Packages 1:2.0.22-2ubuntu3 500 500 http://ports.ubuntu.com/ubuntu-ports lunar/main s390x Packages user@zbox:~$ sudo reboot Broadcast message from root@zbox on pts/1 (Thu 2023-08-17 15:56:49 UTC): The system will reboot now! user@zbox:~$ Connection to zbox closed by remote host. Connection to zbox closed. user@workstation:~$ ssh user@zbox Welcome to Ubuntu 23.04 (GNU/Linux 6.2.0-27-generic s390x) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Thu Aug 17 04:00:38 PM UTC 2023 System load: 0.05 Memory usage: 3% Processes: 210 Usage of /: 31.5% of 30.34GB Swap usage: 0% Users logged in: 0 * Strictly confined Kubernetes makes edge and IoT secure. Learn how MicroK8s just raised the bar for easy, resilient and secure K8s cluster deployment. https://ubuntu.com/engage/secure-kubernetes-at-the-edge 0 updates can be applied immediately. Last login: Thu Aug 17 15:53:29 2023 from 10.172.66.67 user@zbox:~$ cat /etc/zipl.conf # This has been modified by the MAAS curtin installer [defaultboot] default=ubuntu [ubuntu] target = /boot image = /boot/vmlinuz ramdisk = /boot/initrd.img parameters = crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M root=/dev/disk/by-id/dm-uuid-LVM-pZBM2KugfCjgfTPlkLba2pHRDuijvaE2pSffrRJsGXz3W50gasTv8h9kEF45eu5H user@zbox:~$ cat /proc/cmdline crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M root=/dev/disk/by-id/dm-uuid-LVM-pZBM2KugfCjgfTPlkLba2pHRDuijvaE2pSffrRJsGXz3W50gasTv8h9kEF45eu5H user@zbox:~$ systemctl status kdump-tools ● kdump-tools.service - Kernel crash dump capture service Loaded: loaded (/lib/systemd/system/kdump-tools.service; enabled; preset: enabled) Active: active (exited) since Sun 2023-08-20 15:57:17 UTC; 2 days left Process: 1066 ExecStart=/etc/init.d/kdump-tools start (code=exited, status=0/SUCCESS) Main PID: 1066 (code=exited, status=0/SUCCESS) CPU: 135ms Warning: some journal files were not opened due to insufficient permissions. user@zbox:~$ sudo kdump-config load [sudo] password for user: * Cannot change symbolic links when kdump is loaded user@zbox:~$ kdump-config show DUMP_MODE: kdump USE_KDUMP: 1 KDUMP_COREDIR: /var/crash crashkernel addr: 0x /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-6.2.0-27-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-6.2.0-27-generic current state: ready to kdump kexec command: /sbin/kexec -p --command-line=" root=/dev/disk/by-id/dm-uuid-LVM-pZBM2KugfCjgfTPlkLba2pHRDuijvaE2pSffrRJsGXz3W50gasTv8h9kEF45eu5H reset_devices systemd.unit=kdump-tools-dump.service nr_cpus=1 irqpoll usbcore.nousb cio_ignore=all,!c000-c002,!e000" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz user@zbox:~$ cat /proc/sys/kernel/sysrq 176 user@zbox:~$ sudo sysctl -w kernel.sysrq=1 kernel.sysrq = 1 user@zbox:~$ sudo -s root@zbox:/home/user# echo c > /proc/sysrq-trigger client_loop: send disconnect: Broken pipe user@workstation:~$ ssh user@zbox Welcome to Ubuntu 23.04 (GNU/Linux 6.2.0-27-generic s390x) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Thu Aug 17 04:07:30 PM UTC 2023 System load: 0.24 Memory usage: 3% Processes: 212 Usage of /: 32.0% of 30.34GB Swap usage: 0% Users logged in: 0 * Strictly confined Kubernetes makes edge and IoT secure. Learn how MicroK8s just raised the bar for easy, resilient and secure K8s cluster deployment. https://ubuntu.com/engage/secure-kubernetes-at-the-edge 0 updates can be applied immediately. Last login: Thu Aug 17 16:00:39 2023 from 10.172.66.67 user@zbox:~$ ls -la /var/crash/ total 336 drwxrwxrwt 4 root root 4096 Aug 20 2023 . drwxr-xr-x 13 root root 4096 Aug 10 00:25 .. drwxr-xr-x 2 root root 4096 Aug 20 2023 202308201513 drwxr-xr-x 2 root root 4096 Aug 20 2023 202308201604 -rw-r--r-- 1 root root 0 Aug 20 2023 kdump_lock -rw------- 1 root root 288684 Aug 17 15:39 kdump-tools.0.crash -rw-r--r-- 1 root root 306 Aug 20 2023 kexec_cmd -rw-r--r-- 1 root root 14639 Aug 17 15:39 linux-image-5.15.0-83-generic-202308201513.crash -rw-r--r-- 1 root root 14618 Aug 17 15:49 linux-image-6.2.0-27-generic-202308201513.crash user@zbox:~$ # upgrade the system that I previously used for the jammy verification, hence there are two crash files listed here