After a standard OS security update the housekeeper process suddenly get's SIGSEGVed, see zabbix-housekeeper-sigsegv.log
Postgresql itself only sees a vanishing connection: zabbix-postgresql.log
It seems to happen right after the select itemid,min(clock) from history_uint group by itemid query finishes.
I attached via strace. But the log is not very helpfull: zabbix-housekeeper-strace.log
So far, a package downgrade, OS restart etc. has not helped. Befor the OS level updates postgresql was presenting an error to the housekeeper that did not seem to create any SIGSEGV:
This postgresql error is no longer present after OS level updates and a reboot. But now housekeeper no longer works.