Missing panic logs in /var/log/kern.log

I just triggered a panic, expecting that the logs will be visible in `/var/log/kern.log` after reboot, but there are no logs present there. Considering I have no access to the serial port, how do I know what went wrong? Is there anything we can do to make sure that the kernel log contains all the messages until before reboot? # sysctl kernel.panic kernel.panic = 30 If more information is needed, please let me know. Best Regards, Manty