We hit a curios bug recently on production with the JIT.

I had apt updated a couple of packages and then all of a sudden a bigger query we run every 5 minutes was failing. Or rather, Postgres just started silently hanging up the connection mid query execution with even putting anything in the logs.

Took me a while of running manually in explain to see that the variations of the query that ended up using the JIT broke while those that didn’t were ok. Disabled the JIT and everything was ok again.