user@zbox:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 22.04.3 LTS Release: 22.04 Codename: jammy user@zbox:~$ uname -a Linux zbox 5.15.0-79-generic #86-Ubuntu SMP Mon Jul 10 16:19:54 UTC 2023 s390x s390x s390x GNU/Linux user@zbox:~$ sudo add-apt-repository -y "deb http://us.ports.ubuntu.com/ubuntu-ports/ $(lsb_release -sc)-proposed main universe" Repository: 'deb http://us.ports.ubuntu.com/ubuntu-ports/ jammy-proposed universe main' Description: Archive for codename: jammy-proposed components: universe,main More info: http://us.ports.ubuntu.com/ubuntu-ports/ Adding repository. Adding deb entry to /etc/apt/sources.list.d/archive_uri-http_us_ports_ubuntu_com_ubuntu-ports_-jammy.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 jammy-proposed InRelease [270 kB] Get:2 https://esm.ubuntu.com/apps/ubuntu jammy-apps-security InRelease [7,553 B] Get:3 https://esm.ubuntu.com/apps/ubuntu jammy-apps-updates InRelease [7,459 B] Get:4 https://esm.ubuntu.com/infra/ubuntu jammy-infra-security InRelease [7,453 B] Get:5 https://esm.ubuntu.com/infra/ubuntu jammy-infra-updates InRelease [7,452 B] Hit:6 http://ports.ubuntu.com/ubuntu-ports jammy InRelease Get:7 http://ports.ubuntu.com/ubuntu-ports jammy-updates InRelease [119 kB] Get:8 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/universe s390x Packages [40.7 kB] Get:9 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/universe Translation-en [26.7 kB] Get:10 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/universe s390x c-n-f Metadata [1,808 B] Get:11 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/main s390x Packages [69.2 kB] Get:12 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/main Translation-en [35.8 kB] Get:13 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/main s390x c-n-f Metadata [2,744 B] Get:14 http://ports.ubuntu.com/ubuntu-ports jammy-backports InRelease [109 kB] Get:15 http://ports.ubuntu.com/ubuntu-ports jammy-security InRelease [110 kB] Get:16 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main s390x Packages [587 kB] Get:17 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main Translation-en [214 kB] Get:18 http://ports.ubuntu.com/ubuntu-ports jammy-updates/restricted Translation-en [114 kB] Get:19 http://ports.ubuntu.com/ubuntu-ports jammy-updates/universe s390x Packages [715 kB] Get:20 http://ports.ubuntu.com/ubuntu-ports jammy-updates/universe Translation-en [211 kB] Get:21 http://ports.ubuntu.com/ubuntu-ports jammy-security/main s390x Packages [390 kB] Get:22 http://ports.ubuntu.com/ubuntu-ports jammy-security/main s390x c-n-f Metadata [10.1 kB] Get:23 http://ports.ubuntu.com/ubuntu-ports jammy-security/universe s390x Packages [530 kB] Fetched 3,585 kB in 2s (1,863 kB/s) Reading package lists... Done user@zbox:~$ sudo apt install kexec-tools=1:2.0.22-2ubuntu2.22.04.2 kdump-tools Reading package lists... Done Building dependency tree... Done Reading state information... Done The following additional packages will be installed: crash libdw1 libsnappy1v5 makedumpfile The following NEW packages will be installed: crash kdump-tools kexec-tools libdw1 libsnappy1v5 makedumpfile 0 upgraded, 6 newly installed, 0 to remove and 41 not upgraded. Need to get 4,242 kB of archives. After this operation, 13.1 MB of additional disk space will be used. Do you want to continue? [Y/n] Y Get:1 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/main s390x kexec-tools s390x 1:2.0.22-2ubuntu2.22.04.2 [54.6 kB] Get:2 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main s390x kdump-tools s390x 1:1.6.10ubuntu2.1 [28.4 kB] Get:3 http://ports.ubuntu.com/ubuntu-ports jammy/main s390x libsnappy1v5 s390x 1.1.8-1build3 [17.3 kB] Get:4 http://ports.ubuntu.com/ubuntu-ports jammy/main s390x crash s390x 8.0.0-1ubuntu1 [3,744 kB] Get:5 http://ports.ubuntu.com/ubuntu-ports jammy/main s390x libdw1 s390x 0.186-1build1 [248 kB] Get:6 http://ports.ubuntu.com/ubuntu-ports jammy/main s390x makedumpfile s390x 1:1.7.0-1build1 [151 kB] Fetched 4,242 kB in 1s (5,002 kB/s) Preconfiguring packages ... Selecting previously unselected package kexec-tools. (Reading database ... 57080 files and directories currently installed.) Preparing to unpack .../0-kexec-tools_1%3a2.0.22-2ubuntu2.22.04.2_s390x.deb ... Unpacking kexec-tools (1:2.0.22-2ubuntu2.22.04.2) ... Selecting previously unselected package kdump-tools. Preparing to unpack .../1-kdump-tools_1%3a1.6.10ubuntu2.1_s390x.deb ... Unpacking kdump-tools (1:1.6.10ubuntu2.1) ... Selecting previously unselected package libsnappy1v5:s390x. Preparing to unpack .../2-libsnappy1v5_1.1.8-1build3_s390x.deb ... Unpacking libsnappy1v5:s390x (1.1.8-1build3) ... Selecting previously unselected package crash. Preparing to unpack .../3-crash_8.0.0-1ubuntu1_s390x.deb ... Unpacking crash (8.0.0-1ubuntu1) ... Selecting previously unselected package libdw1:s390x. Preparing to unpack .../4-libdw1_0.186-1build1_s390x.deb ... Unpacking libdw1:s390x (0.186-1build1) ... Selecting previously unselected package makedumpfile. Preparing to unpack .../5-makedumpfile_1%3a1.7.0-1build1_s390x.deb ... Unpacking makedumpfile (1:1.7.0-1build1) ... Setting up libdw1:s390x (0.186-1build1) ... Setting up libsnappy1v5:s390x (1.1.8-1build3) ... Setting up crash (8.0.0-1ubuntu1) ... Setting up makedumpfile (1:1.7.0-1build1) ... Setting up kexec-tools (1:2.0.22-2ubuntu2.22.04.2) ... Generating /etc/default/kexec... Setting up kdump-tools (1:1.6.10ubuntu2.1) ... Replacing config file /etc/zipl.conf with new version Using config file '/etc/zipl.conf' Run /lib/s390-tools//zipl_helper.device-mapper /boot Building bootmap in '/boot' Adding IPL section 'ubuntu' (default) Preparing boot device: dm-0. Done. Creating config file /etc/default/kdump-tools with new version Created symlink /etc/systemd/system/multi-user.target.wants/kdump-tools.service → /lib/systemd/system/kdump-tools.servi ce. kdump-tools-dump.service is a disabled or a static unit, not starting it. Processing triggers for libc-bin (2.35-0ubuntu3.1) ... Processing triggers for man-db (2.10.2-1) ... Processing triggers for initramfs-tools (0.140ubuntu13.2) ... update-initramfs: Generating /boot/initrd.img-5.15.0-79-generic Using config file '/etc/zipl.conf' Run /lib/s390-tools//zipl_helper.device-mapper /boot Building bootmap in '/boot' Adding IPL section 'ubuntu' (default) Preparing boot device: dm-0. Done. 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: 1:2.0.22-2ubuntu2.22.04.2 Candidate: 1:2.0.22-2ubuntu2.22.04.2 Version table: *** 1:2.0.22-2ubuntu2.22.04.2 500 500 http://us.ports.ubuntu.com/ubuntu-ports jammy-proposed/main s390x Packages 100 /var/lib/dpkg/status 1:2.0.22-2ubuntu2.22.04.1 500 500 http://ports.ubuntu.com/ubuntu-ports jammy-updates/main s390x Packages 1:2.0.22-2ubuntu2 500 500 http://ports.ubuntu.com/ubuntu-ports jammy/main s390x Packages user@zbox:~$ sudo reboot Connection to zbox closed by remote host. Connection to zbox closed. user@workstation:~$ ssh user@zbox Welcome to Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-79-generic s390x) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Thu Aug 17 03:00:47 PM UTC 2023 System load: 0.12841796875 Memory usage: 3% Processes: 213 Usage of /: 28.8% 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 Expanded Security Maintenance for Applications is enabled. 41 updates can be applied immediately. To see these additional updates run: apt list --upgradable Last login: Thu Aug 17 14:49:59 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 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 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; vendor preset: enabled) Active: active (exited) since Thu 2023-08-17 15:08:46 UTC; 1min 22s ago Process: 1271 ExecStart=/etc/init.d/kdump-tools start (code=exited, status=0/SUCCESS) Main PID: 1271 (code=exited, status=0/SUCCESS) CPU: 4.528s 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-5.15.0-79-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-5.15.0-79-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 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 ssh: connect to host zbox port 22: Connection refused user@workstation:~$ ssh user@zbox Welcome to Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-79-generic s390x) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Thu Aug 17 03:25:08 PM UTC 2023 System load: 0.0 Memory usage: 3% Processes: 191 Usage of /: 29.4% 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 Expanded Security Maintenance for Applications is enabled. 41 updates can be applied immediately. To see these additional updates run: apt list --upgradable Last login: Thu Aug 17 15:09:14 2023 from 10.172.66.67 user@zbox:~$ ls -la /var/crash/ total 32 drwxrwxrwt 3 root root 4096 Aug 17 15:16 . drwxr-xr-x 13 root root 4096 Aug 10 00:25 .. drwxr-xr-x 2 root root 4096 Aug 20 2023 202308201513 -rw-r--r-- 1 root root 0 Aug 20 2023 kdump_lock -rw-r--r-- 1 root root 298 Aug 17 15:16 kexec_cmd -rw-r----- 1 root root 14621 Aug 17 15:16 linux-image-5.15.0-79-generic-202308201513.crash user@zbox:~$