Description

Occasionally, without any specific action on my end, a normal long-polling sync loop becomes a storm of syncs, as each next request sent from Quotient returns immediately (30-40 ms) with a JSON object that has the full sync response structure (rooms with invite/join/leave inside, account_data, to_device, etc.) and reasonable-looking next_batch but with empty objects (apparently because no events arrived since the last sync). Usually this happens within 30 seconds to 2 minutes, and requests stay with the server in a normal way (seconds) after that.

Steps to reproduce

I couldn't identify a particular pattern. For reference, it occured between 10:28 and 10:29 CEST with sync coming from my user (@kitsune), with next_batch at 10:29:07 looking like "s1589639296_757284957_14250253_610667103_445506552_1585308_106571744_371537760_134971"

• Homeserver: matrix.org