Vacuumdb Fails: Huge Tuple

Hey list,

After some downtime of my site while completing rigorous database
maintenance, I wanted to make sure all the databases were fully
vacuumed and analyzed. I do run autovacuum, but since I made several
significant changes, I wanted to force a vacuum before I brought my
site back online.

Here's what happened:

$ vacuumdb --all --full --analyze --no-password
vacuumdb: vacuuming database "postgres"
vacuumdb: vacuuming database "web_main"
vacuumdb: vacuuming of database "web_main" failed: ERROR: huge tuple

I was told on IRC that this may be related to a GIN index. I do have
several GIN indexes used for full-text searching. I tried googling,
but nothing much came up.

Thanks for the help.