Migration murder from 3.2 to 3.10 (Debian 11 to 13 ) – problems with shared folders

Hi,

our Cyrus murder runs now with version 3.10.2 – 2 backends, 2 frontends, 1 
mupdate.
We xferred  ~ 14000 users mailboxes and ~ 500 shared folders with 
subfolders. All in all it runs very good.

We’re facing a problem with shared folders. Our shared folders have this 
scheme:  "group.sub.name"
The problem occurs when creating a new shared folder "group.sub.othername" 
on backend "packet":

2026-04-28T12:57:40.824198+02:00 packet cyrus/imaps[2647805]: MUPDATE: can't 
commit mailbox entry for 'group'
2026-04-28T12:57:40.828960+02:00 packet cyrus/imaps[2647805]: Fatal error: 
Internal error: assertion failed: imap/imapd.c: 1494: !open_mailboxes_exist()

Hm, "group" shouldn’t be a mailbox, at least it wasn't on cyrus-imapd 
3.2.11. But now there is :

"group": {"name": "group", "mtime": "1776145377", "uidvalidity": "0", 
"createdmodseq": "0", "foldermodseq": "0", "mbtype": "er", "partition": "2", 
"server": "parcel…", "acl": {"anyone": "p"}, "name_history": []},

It’s located on the other backend server "parcel". So all new shared 
mailboxes starting with "group" can only be created on this backend. Do I 
miss a configuration, or is the intentional? Any ideas?

Thanks,
Frank

-- 
Frank Richter, Chemnitz University of Technology, Germany


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