Replacing Berkeley db-4.0.14 with db-3.3.11 ... problem is the same : it segfaults ...
And in log file I have only this : May 21 15:20:06 pegase master[7379]: process started May 21 15:20:06 pegase master[7380]: about to exec /usr/cyrus/bin/ctl_cyrusdb May 21 15:20:06 pegase ctl_cyrusdb[7380]: recovering cyrus databases May 21 15:20:07 pegase ctl_cyrusdb[7380]: done recovering cyrus databases