[Touch-packages] [Bug 1793369] Re: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc/sysrq-trigger
The default sysctl setting for kernel.sysrq in Ubuntu is 176 (and was in bionic and xenial) and it is shipped in /etc/sysctl.d/10-magic- sysrq.conf file. This file is provided by a required package from the minimal task, called `procps`. 176 enables: 128 - allow reboot/poweroff 32 - enable remount read-only 16 - enable sync command Do you have `procps` package installed on your system? Is anything else overriding that setting? If that setting is not suitable for you, I recommend to either modify /etc/sysctl.d/10-magic-sysrq.conf or to add another .conf drop in, with a higher number in /etc/sysctl.d directory to suit your system better. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1793369 Title: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc /sysrq-trigger Status in The Ubuntu-power-systems project: Invalid Status in linux package in Ubuntu: Invalid Status in systemd package in Ubuntu: Invalid Status in linux source package in Cosmic: Invalid Status in systemd source package in Cosmic: Won't Fix Bug description: == Comment: #0 - Praveen K. Pandey - 2018-09-19 04:49:39 == ---Problem Description--- [Witherspoon-DD2.2][Ubu 18.10] [4.18.0-7-generic ] : Sysrq trigger disabled when writing to /proc/sysrq-trigger while testing kdump trying trigger kdump panic via /proc/sysrq-trigger it failed as : SysRq : This sysrq operation is disabled LOG: root@test:~# cat /proc/sys/kernel/sysrq 176 root@test:~# echo c > /proc/sysrq-trigger root@test:~# dmesg [ 380.340051] mlx5_core :01:00.1 enp1s0f1: Self test out: status flags(0x2) [ 389.404239] sysrq: SysRq : This sysrq operation is disabled. root@test~# cat /boot/config-4.18.0-7-generic | grep CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x01b6 CONFIG_MAGIC_SYSRQ_SERIAL=y root@test:~# cat /etc/sysctl.conf | grep kernel.sysrq #kernel.sysrq=438 root@test:~# kdump-config show DUMP_MODE:kdump USE_KDUMP:1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR:/var/crash crashkernel addr: /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.18.0-7-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.18.0-7-generic current state:ready to kdump kexec command: /sbin/kexec -p --command-line="root=UUID=c0302064-c5a3-49a7-8bd4-402283e6fcbe ro quiet splash nr_cpus=1 systemd.unit=kdump-tools.service irqpoll noirqdistrib nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz root@test:~# Regards Praveen == Comment: #2 - Praveen K. Pandey - 2018-09-19 05:16:11 == when i enable in /etc/sysctl.conf it works . i append below value in sysctl.conf echo "kernel.sysrq = 1" >> /etc/sysctl.conf I think this is should be enable by default in ubuntu 18.10 as earlier ubuntu distro it has , not sure why it got removed as kdump mechanism require this . Praveen Regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1793369/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1793369] Re: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc/sysrq-trigger
** Tags removed: targetmilestone-inin--- ** Tags added: targetmilestone-inin1810 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1793369 Title: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc /sysrq-trigger Status in The Ubuntu-power-systems project: Invalid Status in linux package in Ubuntu: Invalid Status in systemd package in Ubuntu: Invalid Status in linux source package in Cosmic: Invalid Status in systemd source package in Cosmic: Won't Fix Bug description: == Comment: #0 - Praveen K. Pandey - 2018-09-19 04:49:39 == ---Problem Description--- [Witherspoon-DD2.2][Ubu 18.10] [4.18.0-7-generic ] : Sysrq trigger disabled when writing to /proc/sysrq-trigger while testing kdump trying trigger kdump panic via /proc/sysrq-trigger it failed as : SysRq : This sysrq operation is disabled LOG: root@test:~# cat /proc/sys/kernel/sysrq 176 root@test:~# echo c > /proc/sysrq-trigger root@test:~# dmesg [ 380.340051] mlx5_core :01:00.1 enp1s0f1: Self test out: status flags(0x2) [ 389.404239] sysrq: SysRq : This sysrq operation is disabled. root@test~# cat /boot/config-4.18.0-7-generic | grep CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x01b6 CONFIG_MAGIC_SYSRQ_SERIAL=y root@test:~# cat /etc/sysctl.conf | grep kernel.sysrq #kernel.sysrq=438 root@test:~# kdump-config show DUMP_MODE:kdump USE_KDUMP:1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR:/var/crash crashkernel addr: /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.18.0-7-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.18.0-7-generic current state:ready to kdump kexec command: /sbin/kexec -p --command-line="root=UUID=c0302064-c5a3-49a7-8bd4-402283e6fcbe ro quiet splash nr_cpus=1 systemd.unit=kdump-tools.service irqpoll noirqdistrib nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz root@test:~# Regards Praveen == Comment: #2 - Praveen K. Pandey - 2018-09-19 05:16:11 == when i enable in /etc/sysctl.conf it works . i append below value in sysctl.conf echo "kernel.sysrq = 1" >> /etc/sysctl.conf I think this is should be enable by default in ubuntu 18.10 as earlier ubuntu distro it has , not sure why it got removed as kdump mechanism require this . Praveen Regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1793369/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1793369] Re: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc/sysrq-trigger
** Changed in: systemd (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1793369 Title: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc /sysrq-trigger Status in The Ubuntu-power-systems project: Invalid Status in linux package in Ubuntu: Invalid Status in systemd package in Ubuntu: Invalid Status in linux source package in Cosmic: Invalid Status in systemd source package in Cosmic: Won't Fix Bug description: == Comment: #0 - Praveen K. Pandey - 2018-09-19 04:49:39 == ---Problem Description--- [Witherspoon-DD2.2][Ubu 18.10] [4.18.0-7-generic ] : Sysrq trigger disabled when writing to /proc/sysrq-trigger while testing kdump trying trigger kdump panic via /proc/sysrq-trigger it failed as : SysRq : This sysrq operation is disabled LOG: root@test:~# cat /proc/sys/kernel/sysrq 176 root@test:~# echo c > /proc/sysrq-trigger root@test:~# dmesg [ 380.340051] mlx5_core :01:00.1 enp1s0f1: Self test out: status flags(0x2) [ 389.404239] sysrq: SysRq : This sysrq operation is disabled. root@test~# cat /boot/config-4.18.0-7-generic | grep CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x01b6 CONFIG_MAGIC_SYSRQ_SERIAL=y root@test:~# cat /etc/sysctl.conf | grep kernel.sysrq #kernel.sysrq=438 root@test:~# kdump-config show DUMP_MODE:kdump USE_KDUMP:1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR:/var/crash crashkernel addr: /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.18.0-7-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.18.0-7-generic current state:ready to kdump kexec command: /sbin/kexec -p --command-line="root=UUID=c0302064-c5a3-49a7-8bd4-402283e6fcbe ro quiet splash nr_cpus=1 systemd.unit=kdump-tools.service irqpoll noirqdistrib nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz root@test:~# Regards Praveen == Comment: #2 - Praveen K. Pandey - 2018-09-19 05:16:11 == when i enable in /etc/sysctl.conf it works . i append below value in sysctl.conf echo "kernel.sysrq = 1" >> /etc/sysctl.conf I think this is should be enable by default in ubuntu 18.10 as earlier ubuntu distro it has , not sure why it got removed as kdump mechanism require this . Praveen Regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1793369/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1793369] Re: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc/sysrq-trigger
** Tags removed: targetmilestone-inin1810 ** Tags added: targetmilestone-inin--- -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1793369 Title: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc /sysrq-trigger Status in The Ubuntu-power-systems project: Invalid Status in linux package in Ubuntu: Invalid Status in systemd package in Ubuntu: New Status in linux source package in Cosmic: Invalid Status in systemd source package in Cosmic: Won't Fix Bug description: == Comment: #0 - Praveen K. Pandey - 2018-09-19 04:49:39 == ---Problem Description--- [Witherspoon-DD2.2][Ubu 18.10] [4.18.0-7-generic ] : Sysrq trigger disabled when writing to /proc/sysrq-trigger while testing kdump trying trigger kdump panic via /proc/sysrq-trigger it failed as : SysRq : This sysrq operation is disabled LOG: root@test:~# cat /proc/sys/kernel/sysrq 176 root@test:~# echo c > /proc/sysrq-trigger root@test:~# dmesg [ 380.340051] mlx5_core :01:00.1 enp1s0f1: Self test out: status flags(0x2) [ 389.404239] sysrq: SysRq : This sysrq operation is disabled. root@test~# cat /boot/config-4.18.0-7-generic | grep CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x01b6 CONFIG_MAGIC_SYSRQ_SERIAL=y root@test:~# cat /etc/sysctl.conf | grep kernel.sysrq #kernel.sysrq=438 root@test:~# kdump-config show DUMP_MODE:kdump USE_KDUMP:1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR:/var/crash crashkernel addr: /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.18.0-7-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.18.0-7-generic current state:ready to kdump kexec command: /sbin/kexec -p --command-line="root=UUID=c0302064-c5a3-49a7-8bd4-402283e6fcbe ro quiet splash nr_cpus=1 systemd.unit=kdump-tools.service irqpoll noirqdistrib nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz root@test:~# Regards Praveen == Comment: #2 - Praveen K. Pandey - 2018-09-19 05:16:11 == when i enable in /etc/sysctl.conf it works . i append below value in sysctl.conf echo "kernel.sysrq = 1" >> /etc/sysctl.conf I think this is should be enable by default in ubuntu 18.10 as earlier ubuntu distro it has , not sure why it got removed as kdump mechanism require this . Praveen Regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1793369/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1793369] Re: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc/sysrq-trigger
** Changed in: ubuntu-power-systems Status: Triaged => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1793369 Title: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc /sysrq-trigger Status in The Ubuntu-power-systems project: Invalid Status in linux package in Ubuntu: Invalid Status in systemd package in Ubuntu: New Status in linux source package in Cosmic: Invalid Status in systemd source package in Cosmic: Won't Fix Bug description: == Comment: #0 - Praveen K. Pandey - 2018-09-19 04:49:39 == ---Problem Description--- [Witherspoon-DD2.2][Ubu 18.10] [4.18.0-7-generic ] : Sysrq trigger disabled when writing to /proc/sysrq-trigger while testing kdump trying trigger kdump panic via /proc/sysrq-trigger it failed as : SysRq : This sysrq operation is disabled LOG: root@test:~# cat /proc/sys/kernel/sysrq 176 root@test:~# echo c > /proc/sysrq-trigger root@test:~# dmesg [ 380.340051] mlx5_core :01:00.1 enp1s0f1: Self test out: status flags(0x2) [ 389.404239] sysrq: SysRq : This sysrq operation is disabled. root@test~# cat /boot/config-4.18.0-7-generic | grep CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x01b6 CONFIG_MAGIC_SYSRQ_SERIAL=y root@test:~# cat /etc/sysctl.conf | grep kernel.sysrq #kernel.sysrq=438 root@test:~# kdump-config show DUMP_MODE:kdump USE_KDUMP:1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR:/var/crash crashkernel addr: /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.18.0-7-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.18.0-7-generic current state:ready to kdump kexec command: /sbin/kexec -p --command-line="root=UUID=c0302064-c5a3-49a7-8bd4-402283e6fcbe ro quiet splash nr_cpus=1 systemd.unit=kdump-tools.service irqpoll noirqdistrib nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz root@test:~# Regards Praveen == Comment: #2 - Praveen K. Pandey - 2018-09-19 05:16:11 == when i enable in /etc/sysctl.conf it works . i append below value in sysctl.conf echo "kernel.sysrq = 1" >> /etc/sysctl.conf I think this is should be enable by default in ubuntu 18.10 as earlier ubuntu distro it has , not sure why it got removed as kdump mechanism require this . Praveen Regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1793369/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
[Touch-packages] [Bug 1793369] Re: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc/sysrq-trigger
The sysrq mechanism allows someone with physical access to the system to easily cause it to boot by just pressing some keys. That's why the sysrq default allows only very few commands to be issued. kdump is for real crashes. kdump testing may require using the sysrq-trigger mechanism, but that could just as well write to /proc/sys/kernel/sysrq before causing the crash. In fact, that's just what kdump-tools autopkgtest does. echo 1 > /proc/sys/kernel/sysrq echo c > /proc/sysrq-trigger So, not a bug here. ** Also affects: systemd (Ubuntu) Importance: Undecided Status: New ** Changed in: systemd (Ubuntu Cosmic) Status: New => Won't Fix ** Changed in: linux (Ubuntu Cosmic) Status: Triaged => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1793369 Title: Ubuntu18.10:ppc64:s390x - Sysrq trigger disabled when writing to /proc /sysrq-trigger Status in The Ubuntu-power-systems project: Triaged Status in linux package in Ubuntu: Invalid Status in systemd package in Ubuntu: New Status in linux source package in Cosmic: Invalid Status in systemd source package in Cosmic: Won't Fix Bug description: == Comment: #0 - Praveen K. Pandey - 2018-09-19 04:49:39 == ---Problem Description--- [Witherspoon-DD2.2][Ubu 18.10] [4.18.0-7-generic ] : Sysrq trigger disabled when writing to /proc/sysrq-trigger while testing kdump trying trigger kdump panic via /proc/sysrq-trigger it failed as : SysRq : This sysrq operation is disabled LOG: root@test:~# cat /proc/sys/kernel/sysrq 176 root@test:~# echo c > /proc/sysrq-trigger root@test:~# dmesg [ 380.340051] mlx5_core :01:00.1 enp1s0f1: Self test out: status flags(0x2) [ 389.404239] sysrq: SysRq : This sysrq operation is disabled. root@test~# cat /boot/config-4.18.0-7-generic | grep CONFIG_MAGIC_SYSRQ CONFIG_MAGIC_SYSRQ=y CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x01b6 CONFIG_MAGIC_SYSRQ_SERIAL=y root@test:~# cat /etc/sysctl.conf | grep kernel.sysrq #kernel.sysrq=438 root@test:~# kdump-config show DUMP_MODE:kdump USE_KDUMP:1 KDUMP_SYSCTL: kernel.panic_on_oops=1 KDUMP_COREDIR:/var/crash crashkernel addr: /var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinux-4.18.0-7-generic kdump initrd: /var/lib/kdump/initrd.img: symbolic link to /var/lib/kdump/initrd.img-4.18.0-7-generic current state:ready to kdump kexec command: /sbin/kexec -p --command-line="root=UUID=c0302064-c5a3-49a7-8bd4-402283e6fcbe ro quiet splash nr_cpus=1 systemd.unit=kdump-tools.service irqpoll noirqdistrib nousb" --initrd=/var/lib/kdump/initrd.img /var/lib/kdump/vmlinuz root@test:~# Regards Praveen == Comment: #2 - Praveen K. Pandey - 2018-09-19 05:16:11 == when i enable in /etc/sysctl.conf it works . i append below value in sysctl.conf echo "kernel.sysrq = 1" >> /etc/sysctl.conf I think this is should be enable by default in ubuntu 18.10 as earlier ubuntu distro it has , not sure why it got removed as kdump mechanism require this . Praveen Regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1793369/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
