Messages are not sent but stay unsent in the chat without error

[kongo09]

Steps to reproduce

1. Enter a room
2. Try to send a message

Outcome

What did you expect?

Message is sent

What happened instead?

Message stays unsent, the read receipt bubble is an empty circle. No error message.

Operating system

Windows 11

Application version

Element version: 1.11.57 Crypto version: Olm 3.2.15

How did you install the app?

No response

Homeserver

element.io

Will you send logs?

Yes

[t3chguy]

What are the IDs of these events so the logs can be parsed?

[kongo09]

room_id: !ZZVNrANIxNgftdLcEU:matrix.org

event_id:

• $UT8A3ZrOChJILDAuTsGeSLbOMzDqYChWXByDsY_4HxY
• $SngzwgNOul4DuqpbcR2nu8G-UQEQqWFLh3aOnXCgKBQ
• $O97Z9v2HD6fyoMrdn5axCiUg5SQQAzEJeKIKDXDKNhA
• $QcFurEZpMn_ZWMA9HD0pTYWyKaTSuL2ALx9uizw7xS8
• $pyytdSIjQy8aFqtIrOXfImOFHP1ne5JsNhMbbuHCUsg

When I now send messages, they go through and appear above the stuck ones. There is no way to resend stuck ones.

[kongo09]

The recipient just tells me that he did indeed receive those five messages, was able to read and respond. I never got these responses, though.

[kongo09]

The same five messages seem to show as UTD of myself above in the timeline:

[t3chguy]

The messages being stuck at the bottom sounds like a server issue of missing remote echo, without remote echo the client has no way to know where the events fit in the order of the timeline as persisted as the server. Indeed in the logs for example UT8A3ZrOChJILDAuTsGeSLbOMzDqYChWXByDsY_4HxY I am not seeing a remote echo. Please open an issue with Synapse.

[kongo09]

How can it be a Synapse problem if it looks ok and normal on mobile?

[t3chguy]

Because the sync stream for all client's isn't the same, the transaction ID should only be sent back to the sender, and when Synapse is running in worker mode different sync workers can fall out of sync with each other causing some data to not be sent into certain streams. If you do a clear cache & reload it should fix the timeline for you in that room, the only way to debug it further would be to see the actual /sync responses but those aren't logged in the client.

[kongo09]

Understood. Is there any way to transfer the issue?

[t3chguy]

For someone with sufficient permissions in both repos, maybe (not me). But then that team will likely have insufficient information given their issue template will have been ignored