I am using debian , the logging system being used is rsyslogd. in /etc/rsyslog.d/default.conf we have rule as follows: ``` kern.* /var/log/kern.log ``` This rule I believe is the reason why all the kernel logs are being redirected to /var/log/kern.log.
Also dmesg does not show anything. So, i am pretty sure that all the kernel logs are being handled solely by `rsyslogd` And this is just the default debian distribution without any customizations. Thank you for the 'pstore' clue. I will explore it further. On Tue, Jun 1, 2021 at 2:42 PM Greg KH <[email protected]> wrote: > On Tue, Jun 01, 2021 at 02:33:50PM +0900, manty kuma wrote: > > 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. > > I have never heard of kernel logs being written to that location, what > tool do you have that does that and where is that documented? > > > Considering I have no access to the serial port, how do I know what went > > wrong? > > When the kernel panics, it usually can not write to the disk, so it's a > bit hard to save anything :) > > That being said, there are ways the kernel can save the crash > information, look into the "pstore" interface and see if that will work > for your hardware platform (it requires hardware to store the > information across boots.) > > good luck! > > greg k-h >
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