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we have some replication issues. From time to time a doveadm-server process takes 100% cpu in the state recv_mailbox_tree_deletes on the replica. The process runs forever until it is manually killed. Strace on this process doesn't show anything. Sometimes we have several doveadm-server processes in this state, all for the same account, all with 100% CPU Load. The logfile on the master says:

...o killing the doveadm-server process will cause it to hang again for the same user? That's good, since it means it can be reproduced by taking a copy of the mailboxes and trying to run "doveadm sync" manually on them locally, e.g.: doveadm -D -o mail=mdbox:/tmp/mdbox1 sync mdbox:/tmp/mdbox2 Does that hang? If yes, we can get further with it. The -D parameter is also helpful here - v2.2.16 logs much more useful debug logging with dsync that can also help catch these kind of hangs. Even if you can't reproduce the hang the above way, having mail_debug=yes for dsync and getting the d...