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LatOffline
Post subject: Can't SysRq+ RSEIUB  PostPosted: 06.02.2016, 02:25



Joined: 2010-09-19
Posts: 204

Status: Offline
Hello everyone. Is there a reason why CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE is 0x0 ?
      Code:
$ zcat /proc/config.gz |grep CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE
CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x0

$ uname -r
4.4.0-1.slh.1-aptosid-amd64


I crashed my system two times, and I couldn't use SysRq R, S, E, I, U, B to restart it.
While both crashes were my fault, I couldn't find a proper wait to restart. I had no choice than power reset.

After doing a search I found in https://www.kernel.org/doc/Documentation/sysrq.txt that the kernel had it disabled and also learned that I could re-enable it with
      Code:
echo "number" >/proc/sys/kernel/sysrq


Is there a better solution to have this enabled without building my own kernel, nor putting that echo code in a /etc/bashrc ? or maybe a GRUB command for the kernel?

Thank you
 
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slhOffline
Post subject: RE: Can  PostPosted: 08.02.2016, 02:37



Joined: 2010-08-25
Posts: 949

Status: Offline
It's indeed intentionally disabled and can be controlled via /proc/sys/kernel/sysrq, stuffing the call into /etc/rc.local can change the desired behaviour permanently (at least beyond the point of rc.local having been started).
 
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LatOffline
Post subject: RE: Can  PostPosted: 09.02.2016, 02:22



Joined: 2010-09-19
Posts: 204

Status: Offline
Thank you
 
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