Some of the crashes we've seen in 10.4 (including the almighty series of labsdb1011 crashes T249188) might be related to the fact that we have:
```
| innodb_change_buffering | all |
```
On the following MariaDB related bugs there is a mention that setting `innodb_change_buffering = inserts` or even to `none` might prevent this from happening again:
https://jira.mariadb.org/browse/MDEV-12463
https://jira.mariadb.org/browse/MDEV-22373 (filed by us)
https://jira.mariadb.org/browse/MDEV-22497
We should evaluate if changing this setting from `all` to `inserts` has some performance impact, and if not, we might need to switch it permanently.
So far the following hosts have it live changed:
- db2129 s6 master
- db2116 s1 slave
Lists of hosts as of 28th Sept 2020: T263443#6497328
More hosts added the 6th Oct on s6: db2087:3316 db2089:3316 db2076 db2097:3316 db2114
More hosts added the 6th Oct on s5: db2075 db2089:3315 db2099:3315 db2111 db2128