Leave/rejoin in invite-only room soft fails membership event #1767

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opened 2026-05-14 08:52:15 +00:00 by bebop · 2 comments

bebop commented

2026-05-14 08:52:15 +00:00

Description:

In an invite-only room (initially made on matrix.org), a user left and rejoined. Myself and another user with continuwuity clients (0.5.8 and 0.5.9) got these logs:

WARN process_inbound_transaction{origin="matrix.org"}: conduwuit_core::matrix::state_res::event_auth:
  sender cannot join as they are not invited to the invite-only room
  sender=<snip> membership_event_id=Some("$PNIx5DnM_qfg_x8gzw_m5pu-J1eTtBHLiXK4oHbTUAQ")
  membership="leave"

INFO process_inbound_transaction{origin="matrix.org"}: conduwuit_service::rooms::event_handler::upgrade_outlier_pdu:
  Soft failing event event_id=$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw

WARN process_inbound_transaction{origin="matrix.org"}: conduwuit_service::rooms::event_handler::upgrade_outlier_pdu:
  Event was soft failed event_id=$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw

WARN process_inbound_transaction{origin="<snip>"}: conduwuit_service::rooms::event_handler::handle_incoming_pdu:
  Prev $oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw failed: M_INVALID_PARAM: Event has been soft failed

In checking the member list, I saw their join event matched ($oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw).

$ curl -H "Authorization: Bearer $CONTINUWUITY_TOKEN" 'https://matrix.andrewzah.com/_matrix/client/v3/rooms/%21PgZOgErOSVJPUGmhkw%3Amatrix.org/members' | jq | grep '"displayname": "<snip>"' -B 5 -A 12
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   7444   0   7444   0      0  29494      0                              0

    {
      "content": {
        "avatar_url": "<snip>",
        "displayname": "<snip>",
        "membership": "join"
      },
      "event_id": "$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw",
      "origin_server_ts": 1778743883702,
      "redacts": null,
      "room_id": "<snip>",
      "sender": "<snip>",
      "state_key": "<snip>",
      "type": "m.room.member"
    },

Problem:

The user who left and rejoined couldn't see messages coming from the continuwuity instance users.

Workaround:

After restarting my continuwuity instance, they were able to see my messages again.

**Description**: In an invite-only room (initially made on matrix.org), a user left and rejoined. Myself and another user with continuwuity clients (0.5.8 and 0.5.9) got these logs: ``` WARN process_inbound_transaction{origin="matrix.org"}: conduwuit_core::matrix::state_res::event_auth: sender cannot join as they are not invited to the invite-only room sender=<snip> membership_event_id=Some("$PNIx5DnM_qfg_x8gzw_m5pu-J1eTtBHLiXK4oHbTUAQ") membership="leave" INFO process_inbound_transaction{origin="matrix.org"}: conduwuit_service::rooms::event_handler::upgrade_outlier_pdu: Soft failing event event_id=$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw WARN process_inbound_transaction{origin="matrix.org"}: conduwuit_service::rooms::event_handler::upgrade_outlier_pdu: Event was soft failed event_id=$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw WARN process_inbound_transaction{origin="<snip>"}: conduwuit_service::rooms::event_handler::handle_incoming_pdu: Prev $oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw failed: M_INVALID_PARAM: Event has been soft failed ``` In checking the member list, I saw their join event matched (`$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw`). ``` $ curl -H "Authorization: Bearer $CONTINUWUITY_TOKEN" 'https://matrix.andrewzah.com/_matrix/client/v3/rooms/%21PgZOgErOSVJPUGmhkw%3Amatrix.org/members' | jq | grep '"displayname": "<snip>"' -B 5 -A 12 % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 7444 0 7444 0 0 29494 0 0 ``` ```json { "content": { "avatar_url": "<snip>", "displayname": "<snip>", "membership": "join" }, "event_id": "$oZzUBf7z6XhBwDnq_zUkxe3rFC-V0N-dEKiXL0p8DTw", "origin_server_ts": 1778743883702, "redacts": null, "room_id": "<snip>", "sender": "<snip>", "state_key": "<snip>", "type": "m.room.member" }, ``` **Problem**: The user who left and rejoined couldn't see messages coming from the continuwuity instance users. **Workaround**: After restarting my continuwuity instance, they were able to see my messages again.

nex commented

2026-05-18 20:17:58 +00:00

Owner

This sounds like the correct behaviour - a user tried a leave -> join transition in a room that requires leave -> invite -> join, so their join membership was illegal and consequently soft-failed. Unless you believe otherwise?

nex added the

labels

2026-05-18 20:18:25 +00:00

bebop commented

2026-05-20 02:44:31 +00:00

Author

Ah ok, I wasn't sure if it was related. I'm not sure why starting my continuwuity instance fixed them not seeing my messages.