Autovacuum after large update, with active RUM index crashes postgres

[poppingtonic]

table with 160k records

UPDATE {table_name} SET {document}=data.{document} FROM
(VALUES %s) AS data ({document}, id)
WHERE {table_name}.id=data.id;

UPDATE {table_name} set {document_vector}=(select to_tsvector({document}));

CREATE INDEX {table_name}_rum_index
ON {table_name} USING RUM ({document_vector} rum_tsvector_ops);

After this set of queries, the autovacuum consumes all available memory before it crashes.

[za-arthur]

Thank you for the issue! Will check.

[za-arthur]

Can you provide a backtrace please?

[za-arthur]

I reproduced it. Work on it.

[poppingtonic]

I took too long to get a backtrace, since my machine would lock up. Glad you reproduced it.

[za-arthur]

I fixed the bug. Can you check it?

[poppingtonic]

Nice work! I ran it while watching htop, and autovacuum topped out at 5% memory right before it stopped.

[za-arthur]

Great!