Can not send messages in specific encrypted room

[NicolasGoeddel]

Steps to reproduce

1. I started with creating a fresh account and verifying my mail address.
2. I then joined #gadgetbridge:matrix.org because I wanted to ask questions.
3. I said hello but a few seconds later I got the message that my message could not be sent.

Outcome

What did you expect?

I expected to be able to just write in that room.

What happened instead?

I can not read the existing messages because they can not be decrypted and I am also not able to write a message because they could not be sent.

Operating system

Ubuntu

Browser information

Firefox 127.0.2 (64-Bit)

URL for webapp

https://app.element.io/#/room/#gadgetbridge:matrix.org

Application version

Version von Element: 1.11.69 Krypto-Version: Rust SDK 0.7.0 (068a0af), Vodozemac 0.6.0

Homeserver

matrix.org

Will you send logs?

Yes

[NicolasGoeddel]

Hm, I just tried to send the protocols but nothing happened. I wasn't even able to download it somehow. It also showed this URL instead: https://github.com/vector-im/element-web/

[NicolasGoeddel]

I also have a long list of DEBUG and WARN messages in my browsers console if you are interested in that. It shows stuff like this:

• WARN matrix_sdk_crypto::session_manager::sessions: Can't establish an Olm session with some devices due to missing Olm support or bad keys
• WARN matrix_sdk_crypto::session_manager::sessions: Tried to create new Olm sessions, but the signed one-time key was missing for some devices
• WARN matrix_sdk_crypto::session_manager::sessions: Error creating Olm session

[t3chguy]

2024-06-30T15:51:26.765Z E Error sending event failed to read or write to the crypto store DomException UnknownError (0): IDBObjectStore.put: The serialized value is too large (size=437672260 bytes, max=267386880 bytes).

@richvdh any ideas?

[richvdh]

I was able to reproduce this. It appears to be specific to the #gadgetbridge:matrix.org room.

[t3chguy]

Based on the internal formula for release blockers, this qualifies

[NicolasGoeddel]

Wow. First time using Matrix just to join this specific room and directly found a weird bug. Thanks guys for looking into it.

Btw. since today I am able to chat in this room using Thunderbird. It didn't work yesterday with Thunderbird but since today it is fine.

[richvdh]

The problem here is that there are a very large number of users in the room, and storing all the data about which users we have shared the keys with is blowing a storage limit.

We can fix it by making our storage more efficient.