I have had 2 freezes recently with a kernel bug reported on the screen. One was at the end of shutdown (on a reboot) and the other just now on bootup (not the same reboot). I had a look in syslog for some info but I suspect that the output wasn't able to be added due to the system halting. I don't know if there's any other place the output could have been saved. Also how/where could I report this bug?