setrlimit: Unable to set file descriptors limit to -1 (at cyrmaster startup) - 2.2.8-0

[Laurent GAUTHIER]

Hello,

On a new configuration of CyrusIMAP on a Debian Sarge, after purged previous version, here's what happends : 

On startup in syslog :

----------------------------------------------------
Sep 21 18:13:52 localhost master[675]: setrlimit: Unable to set file descriptors limit to -1: Operation not permitted
Sep 21 18:13:52 localhost master[675]: retrying with 1024 (current max)
Sep 21 18:13:52 localhost master[675]: process started
Sep 21 18:13:53 localhost master[709]: about to exec /usr/sbin/ctl_cyrusdb
Sep 21 18:13:53 localhost master[742]: about to exec /usr/sbin/ctl_deliver
Sep 21 18:13:54 localhost master[675]: process 742 exited, status 25
Sep 21 18:13:54 localhost master[743]: about to exec /usr/sbin/tls_prune
Sep 21 18:13:54 localhost master[675]: ready for work
----------------------------------------------------

#/etc/init.d/cyrus21 stop
Stopping Cyrus IMAPd: (failed).

#netsat -atupn
tcp        0      0 0.0.0.0:110             0.0.0.0:*               LISTEN     675/cyrmaster
tcp        0      0 0.0.0.0:143             0.0.0.0:*               LISTEN     675/cyrmaster
tcp        0      0 127.0.0.1:2000          0.0.0.0:*               LISTEN     675/cyrmaster

#cyrus.conf
#
START {
        recover         cmd="/usr/sbin/ctl_cyrusdb -r"

        delprune        cmd="/usr/sbin/ctl_deliver -E 3"
        tlsprune        cmd="/usr/sbin/tls_prune"
}
SERVICES {
        imap            cmd="/usr/lib/cyrus/bin/imapd -U 30" listen="imap" prefork=0 maxchild=100
        pop3            cmd="/usr/lib/cyrus/bin/pop3d -U 30" listen="pop3" prefork=0 maxchild=50
        lmtpunix        cmd="/usr/lib/cyrus/bin/lmtpd" listen="/var/run/cyrus/socket/lmtp" prefork=0 maxchild=20
        sieve           cmd="/usr/lib/cyrus/bin/timsieved" listen="localhost:sieve" prefork=0 maxchild=100
        notify          cmd="/usr/lib/cyrus/bin/notifyd" listen="/var/run/cyrus/socket/notify" proto="udp" prefork=1
}
EVENTS {
        checkpoint      cmd="/usr/sbin/ctl_cyrusdb -c" period=30
        delprune        cmd="/usr/sbin/ctl_deliver -E 3" at=0401
        tlsprune        cmd="/usr/sbin/tls_prune" at=0401
}

# dpkg -l |grep cyrus
ii  cyrus21-admin  2.2.8-0        Cyrus mail system (administration tool)
ii  cyrus21-client 2.2.8-0        Cyrus mail system (test clients)
ii  cyrus21-common 2.2.8-0        Cyrus mail system (common files)
ii  cyrus21-dev    2.2.8-0        Cyrus mail system (developer files)
ii  cyrus21-doc    2.2.8-0        Cyrus mail system (documentation files)
ii  cyrus21-imapd  2.2.8-0        Cyrus mail system (IMAP support)
ii  cyrus21-murder 2.2.8-0        Cyrus mail system (proxies and aggregator)
ii  cyrus21-pop3d  2.2.8-0        Cyrus mail system (POP3 support)
ii  libcyrus-imap- 2.2.8-0        Interface to Cyrus imap client imclient libr

What goes wrong? I haven't configured any specific  Any ideas? 
Thanks for help.
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