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First a little bit of information about my system:

OS: Ubuntu 18.04 with encryption while installing

DE: i3wm (probably doesn't have to with this, because the same problem appears in Gnome)

Hardware: Lenovo T470

Since about three days I'm encountering the problem, that all of a sudden the CPU usage rises to about 100% (sometimes 98%). Shortly after the rise nothing works anymore and bash returns an "Input/Output error" and I have to power off by removing the battery...

Now I know Input/Output errors usually happen because the hard drive is full, but mine isn't even remotely full (at about 7% - checked with df).

Here is the output of journalctl of the last two boots: Journal

I don't understand what's going on and I already had to repeat some work because of this, so any help is appreciated.

andoril
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  • Which process takes so much CPU according to e.g top command? – jarno Mar 19 '19 at 18:32
  • @jarno: I don't know, because I can't start top anymore if this happens. Do you happen to know about a monitoring tool I could use to further analyse this? – andoril Mar 19 '19 at 19:13
  • Use this instead of removing battery. You could run top -b >output.txt to save top's output in the file output.txt, and check afterwards what was going on. – jarno Mar 19 '19 at 19:41
  • Thank you so far. Didn't know about the SysRQ key^^

    I'll edit the question as soon as I have some top output that could help.

     – andoril Mar 19 '19 at 20:00
  • @jarno Hey. It's me again. The problem didn't happen again, so I guess I'm fine now? However what shall I do with my question? Mark it as solved? Let it stay open? – andoril Mar 22 '19 at 08:11
  • Maybe the issue relates to some job running in background occasionally. I suggest you keep this open. – jarno Mar 22 '19 at 14:09

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