mailbox transfer between cyrus 2.5 backends

[Andreas S. Kerber]

Hi,

is anybody having issues transfering mailboxes away from version 2.5 backends?
We're in the process of updating our cyrus 2.3/2.4 servers to version 2.5 and when trying to transfer a mailbox from an version 2.5 backend to another backend which runs 2.5/2.4 or 2.3, we're seeing that the mailbox transfers aborts and we're ending up having the mailbox existant an the source and destination backend servers.

Our mupdate server as well as the frontend servers still run version 2.3. In order to find a workarround, I've added a temporary 2.5 frontend server to test those transfers again, but "proxyd" seems to crash:

Mar 25 13:46:59 frontend1 imap[17937]: proxy cyradm sessionid=<frontend-17937-1427287612-1> remote=<backend2-15379-1427287619-1-5239
756101038323198>
Mar 25 13:46:59 frontend1 master[17847]: process type:SERVICE name:imap path:/usr/local/cyrus/bin/proxyd age:29.201s pid:17937 signaled to death by signal 11 (Segmentation fault)
Mar 25 13:46:59 frontend1 kernel: proxyd[17937]: segfault at 0 ip 00007f89873be57f sp 00007fff54936f28 error 4 in libc-2.12.so[7f898728b000+18a000]

Do mailbox transfers away from 2.5 backends work for you? Do we have to upgrade mupdate to 2.5 in order to fix this?
Mailbox transfers from 2.3/2.4 backends to 2.5 backends work fine BTW.

Andreas