Element (occasionally) repeatedly spams /sync

[chebureki]

Steps to reproduce

1. Use app.element.io
2. Create a message or two
3. Sit back and observe the developer tools

Outcome

What did you expect?

To only request /sync upon when

What happened instead?

All these elements share the same since parameter.
About 20,000 requests have been made in a matter of 30 seconds

I suspect this is an synapse issue, where long polling is incorrect.

Operating system

Arch Linux

Browser information

Chromium Version 112.0.5615.165

URL for webapp

localhost

Application version

Element version: 1.11.26 Olm version: 3.2.12

Homeserver

Synapse 1.82.0

Will you send logs?

Yes

[t3chguy]

What is the response of the /sync request? Without knowing that we can't dig into it

[chebureki]

What is the response of the /sync request? Without knowing that we can't dig into it

{"next_batch":"s306_5214_50_1_200_1_1_20_0_1","device_lists":{"changed":["@kirill:my.matrix.host"]},"device_one_time_keys_count":{"signed_curve25519":50},"org.matrix.msc2732.device_unused_fallback_key_types":["signed_curve25519"],"device_unused_fallback_key_types":["signed_curve25519"]}

[t3chguy]

Will you send logs?
Yes

Not seeing any logs submitted from you

Thanks for the /sync response though, looks like Synapse is sending an incremented next_batch so something is causing the sync to be retried and not persisted properly

[richvdh]

matrix-org/synapse#15824

[richvdh]

Thanks for the /sync response though, looks like Synapse is sending an incremented next_batch so something is causing the sync to be retried and not persisted properly

meh, maybe not matrix-org/synapse#15824. It's a bit hard to tell though: given the report there is no way to correlate request and response.

If this happens again, please send debug logs from within Element.