On Tue, Jun 1, 2021 at 2:07 PM manty kuma <mantykuma@xxxxxxxxx> wrote: > > 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 <greg@xxxxxxxxx> 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.) Also, check kdump, I think it can help as well. >> good luck! >> >> greg k-h > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
