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Questions tagged [magic-sysrq]

The "magic sysrq" key sequence is a feature of the Linux kernel that, when enabled, provides debugging and disaster recovery features on the system console and serial console.

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SysRQ+B (boot) not working but O (turning off) is

For some reason, my Linux machine will properly turn off when striking SysRq+O, but won't reboot as expected when doing SysRq+B. Both of these ones show up in the help message (with SysRq+H) and all ...
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How does oom killer behave after alt+sysrq+f?

I learned that after ALT+SysRq+f "oom_kill is called, to kill a process to alleviate an OOM condition". On the other hand I know that oom killer starts automatically if there is not enough memory for ...
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1answer
112 views

SysRq doesn't display any result on terminal

I use Mint 19.2, and I try to see CPU backtrace by the following process. $ sudo -s # sysctl -w kernel.sysrq=1 # echo l > /proc/sysrq-trigger But, nothing happened. I researched more ...
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Undo Magic SysRq “remount-ro”

Is there a way to undo an accidental Magic SysRq "remount-ro"? On my notebook keyboard, this combination happens all too often... I tried to remount the roor partition with mount -o remount,rw /dev/...
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756 views

How to ensure SysRq is always enabled regardless of the kernel.sysrq setting?

Some Linux distributions have kernel.sysrq=16 which means only Sysrq+s (sync) is allowed. As an example: Fedora (25 and 28) has it set as such in /usr/lib/sysctl.d/50-default.conf I had to create a ...
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Why does SaK kill gdm, which is running on a different VT?

I run Fedora Linux 28, and have enabled sysrq. I pressed Alt+PrtScr+K, to kill a non-responsive X session. But this also restarted gdm, and one other X session, which were running on different VTs. ...
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137 views

Can't figure out the way to trigger Magic Sys Keys via keyboard debian 9 lxdm 0.53-2 xfce4.12.3

I use a debian 9 with Magic Sys Keys enabled : sysctl -a | grep sysrq kernel.sysrq = 1 if I trigger in CLI, it works : echo f > /proc/sysrq-trigger I have something like : emergency sync ...
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240 views

Set kernel.sysrq = 1 in /etc/sysctl.d/10-magic-sysrq.conf using command? [duplicate]

I wish to use a single command line instead of opening the text editor to change the parameter of the file /etc/sysctl.d/10-magic-sysrq.conf to kernel-sysrq = 1 from any current parameter, even if ...
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52 views

Under what circumstance could switching tty's and entering commands freeze?

I noticed, that when booted from a live disc, and the RAM is filled up nearly, the live DVD starts being accessed far more often (probably due to exhausted and squished block cache) and switching tty'...
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65 views

SysRq output into |less, |more, |tee?

If I issue a SysRq command, how do I redirect that output (whether it is stdout or stderr is documented nowhere) to |less, |more or |tee?
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268 views

How to stop a SysRq command?

I used SysRq+J (thaw), now I am being flooded with printk messages: emergency thaw on sr0. It will never stop. I do not wish to wait, until a SysRq command ends while blocking the terminal all the ...
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Reasons for CTRL+PrtScr+R+E+I+S+U+B

If Linux stops responding one might be forced to make an unclean shutdown and in this case one might unknowingly just turn off the power. I read that you should try and make a soft reset with ctrl+...
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517 views

Cannot get kernel crash dump saved and reboot

I need to get a crash dump of my linux kernel. I am going to describe the scenario: Hardware: Notebook Dell E5450. Linux Distribution: Linux Mint 18.3 (Ubuntu 16.04). SysRq: enabled by /etc/sysctl.d/...
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1answer
89 views

Can a magic sysreq key combo run a script?

I'm experiencing system hangs which seem to correlate with high RAM usage levels (though swap is mostly unused). I'd like to be able to kill thunderbird and other memory hogs via a script with a ...
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769 views

does “echo -m > /proc/sysrq-trigger” run in process context when it runs from script?

we have a script which runs below sysrq command to get memory info in syslog and then script copies the syslog. echo -m > /proc/sysrq-trigger From documentation I see that at the at kernel level "...

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