I’m trying to troubleshoot a sudden reboot that just happened and I’m not sure where to look. I have run journalctl -b 1 which doesn’t seem to tell me much. Last line is:
wpa_supplicant[1349]: wlp0s20f3: CTRL-EVENT-BEACON-LOSS
Is there a place I need to look for in order to find some kernel panic log maybe? What else can I do to understand more about the cause of this?
Should be -b -1 to look at the previous boot. A typo when you created this post?
However, if this was a sudden reboot its quite possible the journal logs were not flushed to disk in time, so you only get to see what the last thing recorded actually was.
Sorry yes it was a typo in the post.
If the kernel panicked, there would be some logs dumped to the disk, no?
You’ll see output in the journal itself and possibly in /var/crash if kdump is enabled. This is only applicable of course, if disk output can actually be flushed.
Very much depends on what is crashing though - usually the serial console is used to debug kernel crashes as it’s pretty simple interface and can often be kept active so long as “something” is running.