Today I experienced this error a second time in two weeks and I wonder why that is?
Is it more a hardware- or software-related thing? (e.g. what should I check?)
That DB server didn't have any problems until now...
don't you have this message in log?
This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail.
I think the problem was that we had different mysql server versions in replication due to the fact that one server has a pending OS upgrade. I installed MariaDB, set up the replication, and everything works now