[LAU] Computer lockup

Bengt Gördén bengan at bag.org
Fri Feb 14 15:41:37 CET 2020

On 2020-02-14 15:29, David Kastrup wrote:
> Goran Mekić <meka at tilda.center> writes:
>> On February 14, 2020 2:18:58 PM UTC, Jeremy Jongepier <jeremy at autostatic.com> wrote:
>>> On 14/02/2020 13:21, David Kastrup wrote:
>>>> I think there are some emergency SysReq key combinations.  No idea
>>>> whether they need some special enabling.  They bypass user space and
>>>> might be worth a try for getting a somewhat more regular shutdown.
>>> Alt + SysReq + REISUB (aka "Reboot Even If System Utterly Broken")
>>> should reboot the machine.
>>> Best,
>>> Jeremy
>> What is SysReq?
> A key on the usual PC keyboards.

It's also implemented in /proc/sys/kernel.

I have this since quite a few years in a script on my computers if, or 
rather when, things goes wrong and I can get in from outside.

echo 1 > /proc/sys/kernel/sysrq
echo r > /proc/sysrq-trigger
echo e > /proc/sysrq-trigger
echo i > /proc/sysrq-trigger
echo s > /proc/sysrq-trigger
echo u > /proc/sysrq-trigger
echo b > /proc/sysrq-trigger


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