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element-hq / element-web

A glossy Matrix collaboration client for the web.
https://element.io
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Bad UTDs (corrupted channel) from me->johannes #23581

Closed ara4n closed 1 year ago

ara4n commented 2 years ago

Steps to reproduce

I sent Johannes a bunch of msgs on Sat in 1:1; he couldn't them on Mon due to corrupted olm channel. Keyshare reqs didn't seem to fix it.

Outcome

E2EE that works.

Operating system

macOS

Application version

nightly

How did you install the app?

nightly

Homeserver

matrix.org -> element.io

Will you send logs?

Yes

poljar commented 1 year ago

The logs show megolm decryption failures with a description that the Olm channel was corrupted.

Sadly there isn't any mention of the room key in the sender logs, no way to check if the room key was sent out.

There are no Olm decryption failures in the recipient logs. So no way to see when the room key should have been received or why the Olm message failed decryption. The recipient does have a suspiciously large amount of Olm sessions with the problematic device Nhu0+B3JJNHr3abToRm0rYjXne20De67kH1RaNZBEAM.

The later log lines show that communication over Olm healed itself.

Sadly nothing to go by here to further investigate.