MatrixCurse.md

Rules

• Never ask Morton for the reason
• Never ask Sybil for her ID
• Never ask Murphy 'Will this go OK?'

The Curse

Some users seems to be cursed… Symptoms:

• can't send to a room because "not in room"
• can't leave the room to re-join because "Not a known room"
• the whole network except your HS got your join event right.

Debugging

• log live view

  To view the live log on console, use
  tail -F /var/log/matrix-synapse/homeserver.log
  You may can't read fast enougt, so grep is your friend.

Tracing the Join

Use your favorite Riot and join the room. You will see the rotating thingy, leave it alone.
Go to the console with the matrix log dir on your HS.

Grep for the room name, like it would appear in the url.
grep -F -n "%23offtopic%3Amatrix.org" The last find should be your request just taken. Look for the GET-xxx--number. grep for it.
grep -F -n "GET-number
Now you should see anything related to the join attempt.

Found a stacktrace reference? view it with less +linenumber homeserver.log