[CentOS] system unresponsive

Wed May 22 14:18:02 UTC 2019
Simon Matter <simon.matter at invoca.ch>

> Ok, we used to get this occasionally on cluster nodes, and we just got it
> on a fileserver (very bad). The system is discovered to be unresponsive:
> it doesn't ping, and plugging a console in, you can see that it's not
> dead, but there nothing at all on the screen, nor does it respond to even
> <ctrl-alt-del>. The only answer is to power cycle it; it comes up fine.
> Nothing in /var/log/dmesg or /var/log/messages. No abrts I can find. sar
> tells me it went unredponsive between 18:10 and 10:20 yesterday. Note that
> there are no further entries in sar, either, for yesterday, after the
> event, and nothing till I power cycled it.
> Has anyone else seen this - I can't imagine it's only us - or have any
> thoughts?
> C 7, 7.6.1810

I saw such an issue recently and never found out what happened and why.